1. General Results, most used to calculate the result A name "project-44.cn" is domain, public suffix is ".cn", top-level-domain is ".cn", top-level-domain-type is "country-code", Country is China, tld-manager is "China Internet Network Information Center (CNNIC)", num .cn-domains preloaded: 730 (complete: 210599) A Good: All ip addresses are public addresses Warning: Only one ip address found: project-44.cn has only one ip address. Warning: Only one ip address found: www.project-44.cn has only one ip address. Warning: No ipv6 address found. Ipv6 is the future with a lot of new features. So every domain name should have an ipv6 address. See https://en.wikipedia.org/wiki/IPv6: project-44.cn has no ipv6 address. Warning: No ipv6 address found. Ipv6 is the future with a lot of new features. So every domain name should have an ipv6 address. See https://en.wikipedia.org/wiki/IPv6: www.project-44.cn has no ipv6 address. A Good: destination is https HSTS-Preload-Status: unknown. Domain never included in the Preload-list. Check https://hstspreload.org/ to learn some basics about the Google-Preload-List. C Error - no preferred version www or non-www. Select one version as preferred version, then add a redirect https + not-preferred version to https + preferred version. Perhaps in your port 443 vHost something like "RewriteEngine on" + "RewriteCond %{SERVER_NAME} = example.com" + "ReWriteRule ^ https://www.example.com%{REQUEST_URI} [END,QSA,R=permanent]" (three rows, without the "). That should create a redirect https + example.com ⇒ https + www.example.com. Or switch both values to use the non-www version as your preferred version. C Error - more then one version with Http-Status 200. After all redirects, all users (and search engines) should see the same https url: Non-www or www, but not both with http status 200. X Fatal error: Nameserver doesn't support TCP connection: ns.cernet.net: Timeout Info: Checking the ip addresses of that domain name not exact one certificate found. So it's impossible to check if that domain requires Server Name Indication (SNI).: Domain project-44.cn, 1 ip addresses. Info: Checking the ip addresses of that domain name not exact one certificate found. So it's impossible to check if that domain requires Server Name Indication (SNI).: Domain www.project-44.cn, 1 ip addresses. B No _mta-sts TXT record found (mta-sts: Mail Transfer Agent Strict Transport Security - see RFC 8461). Read the result of server-daten.de (Url-Checks, Comments, Connections and DomainServiceRecords) to see a complete definition. Domainname: _mta-sts.project-44.cn 2. Header-Checks F project-44.cn 47.116.1.111 Content-Security-Policy Critical: Missing Header: F project-44.cn 47.116.1.111 X-Content-Type-Options Critical: Missing Header: F project-44.cn 47.116.1.111 Referrer-Policy Critical: Missing Header: F project-44.cn 47.116.1.111 Permissions-Policy Critical: Missing Header: F www.project-44.cn 47.116.1.111 Content-Security-Policy Critical: Missing Header: F www.project-44.cn 47.116.1.111 X-Content-Type-Options Critical: Missing Header: F www.project-44.cn 47.116.1.111 Referrer-Policy Critical: Missing Header: F www.project-44.cn 47.116.1.111 Permissions-Policy Critical: Missing Header: 3. DNS- and NameServer - Checks A Info:: 13 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 4 Name Servers. A Info:: 13 Queries complete, 13 with IPv6, 0 with IPv4. A Good: All DNS Queries done via IPv6. Ok (4 - 8):: An average of 3.3 queries per domain name server required to find all ip addresses of all name servers. A Info:: 4 different Name Servers found: dns31.hichina.com, dns32.hichina.com, ns1.alidns.com, ns2.alidns.com, 2 Name Servers included in Delegation: dns31.hichina.com, dns32.hichina.com, 2 Name Servers included in 1 Zone definitions: ns1.alidns.com, ns2.alidns.com, 1 Name Servers listed in SOA.Primary: ns1.alidns.com. A Good: Only one SOA.Primary Name Server found.: ns1.alidns.com. Error: SOA.Primary Name Server not included in the delegation set.: ns1.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (120.76.107.39): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (120.76.107.59): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (139.224.142.109): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (139.224.142.99): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (39.96.153.39): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (39.96.153.59): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (47.118.199.199): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (47.118.199.219): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns31.hichina.com (2408:4009:501::39): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (120.76.107.37): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (120.76.107.62): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (139.224.142.102): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (139.224.142.107): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (39.96.153.37): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (39.96.153.62): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (47.118.199.197): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (47.118.199.221): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns32.hichina.com (2408:4009:501::40): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (120.76.107.45): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (120.76.107.55): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (139.224.142.115): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (139.224.142.125): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (39.96.153.45): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (39.96.153.55): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (47.118.199.205): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (47.118.199.215): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns1.alidns.com (2408:4009:501::1): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (120.76.107.46): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (120.76.107.56): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (139.224.142.116): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (139.224.142.126): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (39.96.153.46): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (39.96.153.56): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (47.118.199.206): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (47.118.199.216): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. X Fatal: Inconsistency between delegation and zone. The set of NS records served by the authoritative name servers must match those proposed for the delegation in the parent zone. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.alidns.com (2408:4009:501::2): Delegation: dns31.hichina.com, dns32.hichina.com, Zone: ns1.alidns.com, ns2.alidns.com. Name Servers defined in Delegation, missing in Zone: dns31.hichina.com, dns32.hichina.com.Name Servers defined in Zone, missing in Delegation: ns1.alidns.com, ns2.alidns.com. A Good: All Name Server Domain Names have a Public Suffix. A Good: All Name Server Domain Names ending with a Public Suffix have minimal one IPv4- or IPv6 address. A Good: All Name Server ip addresses are public. A Good: Minimal 2 different name servers (public suffix and public ip address) found: 4 different Name Servers found Warning: All Name Servers have the same Top Level Domain / Public Suffix. If there is a problem with that Top Level Domain, your domain may be affected. Better: Use Name Servers with different top level domains.: 4 Name Servers, 1 Top Level Domain: com A Good: Name Servers with different domain names found.: 2 different Domains found Warning: All Name Servers from the same Country / IP location.: 4 Name Servers, 1 Countries: CN A Info: Ipv4-Subnet-list: 32 Name Servers, 4 different subnets (first Byte): 120., 139., 39., 47., 4 different subnets (first two Bytes): 120.76., 139.224., 39.96., 47.118., 4 different subnets (first three Bytes): 120.76.107., 139.224.142., 39.96.153., 47.118.199. A Good: Name Server IPv4-addresses from different subnet found: A Info: IPv6-Subnet-list: 4 Name Servers with IPv6, 1 different subnets (first block): 2408:, 1 different subnets (first two blocks): 2408:4009:, 1 different subnets (first three blocks): 2408:4009:0501:, 1 different subnets (first four blocks): 2408:4009:0501:0000: Fatal: All Name Server IPv6 addresses from the same subnet. A Info: Nameserver mit different domain names found. May be a problem with DNS-Updates A Good: Nameserver supports TCP connections: 36 good Nameserver A Good: Nameserver supports Echo Capitalization: 36 good Nameserver X Nameserver Timeout checking EDNS512: d.dns.cn X Nameserver Timeout checking EDNS512: dns31.hichina.com / 2408:4009:501::39 X Nameserver Timeout checking EDNS512: ns2.alidns.com / 120.76.107.56 Nameserver doesn't pass all EDNS-Checks: a.dns.cn: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: dns31.hichina.com / 2408:4009:501::39: OP100: fatal timeout. FLAGS: fatal timeout. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: fatal timeout. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: dns32.hichina.com / 120.76.107.62: OP100: ok. FLAGS: fatal timeout. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: dns32.hichina.com / 2408:4009:501::40: OP100: ok. FLAGS: ok. V1: fatal timeout. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: e.dns.cn: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: fatal timeout. Nameserver doesn't pass all EDNS-Checks: ns1.alidns.com: OP100: no result. FLAGS: no result. V1: no result. V1OP100: no result. V1FLAGS: no result. DNSSEC: no result. V1DNSSEC: no result. NSID: no result. COOKIE: no result. CLIENTSUBNET: no result. Nameserver doesn't pass all EDNS-Checks: ns1.alidns.com / 39.96.153.45: OP100: fatal timeout. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: fatal timeout. Nameserver doesn't pass all EDNS-Checks: ns1.alidns.com / 120.76.107.45: OP100: ok. FLAGS: fatal timeout. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: fatal timeout. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: ns1.alidns.com / 2408:4009:501::1: OP100: fatal timeout. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. A Good: All SOA have the same Serial Number Warning: No CAA entry with issue/issuewild found, every CAA can create a certificate. Read https://en.wikipedia.org/wiki/DNS_Certification_Authority_Authorization to learn some basics about the idea of CAA. Your name server must support such an entry. Not all dns providers support CAA entries. 4. Content- and Performance-critical Checks http://project-44.cn/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 47.116.1.111 Fatal: Check of /.well-known/acme-challenge/random-filename has a timeout. Creating a Letsencrypt certificate via http-01 challenge can't work. You need a running webserver (http) and an open port 80. If it's a home server + ipv4, perhaps a correct port forwarding port 80 extern ⇒ working port intern is required. Port 80 / http can redirect to another domain port 80 or port 443, but not other ports. If it's a home server, perhaps your ISP blocks port 80. Then you may use the dns-01 challenge. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask. http://www.project-44.cn/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 47.116.1.111 Fatal: Check of /.well-known/acme-challenge/random-filename has a timeout. Creating a Letsencrypt certificate via http-01 challenge can't work. You need a running webserver (http) and an open port 80. If it's a home server + ipv4, perhaps a correct port forwarding port 80 extern ⇒ working port intern is required. Port 80 / http can redirect to another domain port 80 or port 443, but not other ports. If it's a home server, perhaps your ISP blocks port 80. Then you may use the dns-01 challenge. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask. A Good: No https + http status 200 with inline CSS / JavaScript found https://project-44.cn/ 47.116.1.111 Warning: Https connections (Standard Port 443) found without support of the http/2 protocol via ALPN. Http/2 is the new Http-Version (old: http 1.1) with some important new features. Update your server software so http/2 is available. Only one TCP-connection per Server (that's a performance boost), Header-Compression and Server Pushs are available. Domain Sharding and Inline-CSS/Javascript shouldn't used with http/2. https://www.project-44.cn/ 47.116.1.111 Warning: Https connections (Standard Port 443) found without support of the http/2 protocol via ALPN. Http/2 is the new Http-Version (old: http 1.1) with some important new features. Update your server software so http/2 is available. Only one TCP-connection per Server (that's a performance boost), Header-Compression and Server Pushs are available. Domain Sharding and Inline-CSS/Javascript shouldn't used with http/2. A Info: No img element found, no alt attribute checked A Good: Domainname is not on the "Specially Designated Nationals And Blocked Persons List" (SDN). That's an US-list of individuals and companies owned or controlled by, or acting for or on behalf of, targeted countries. It also lists individuals, groups, and entities, such as terrorists and narcotics traffickers designated under programs that are not country-specific. Collectively, such individuals and companies are called "Specially Designated Nationals" or "SDNs." Their assets are blocked and U.S. persons are generally prohibited from dealing with them. So if a domain name is on that list, it's impossible to create a Letsencrypt certificate with that domain name. Check the list manual - https://www.treasury.gov/resource-center/sanctions/sdn-list/pages/default.aspx A Duration: 1518400 milliseconds, 1518.400 seconds