1. General Results, most used to calculate the result A name "xnxx.net" is domain, public suffix is ".net", top-level-domain is ".net", top-level-domain-type is "generic", tld-manager is "VeriSign Global Registry Services", num .net-domains preloaded: 8862 (complete: 231048) A Good: All ip addresses are public addresses Warning: Only one ip address found: www.xnxx.net has only one ip address. Warning: Only one ip address found: xnxx.net 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: www.xnxx.net 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: xnxx.net has no ipv6 address. A Good: No asked Authoritative Name Server had a timeout A Good: destination is https A Good: No cookie sent via http. HSTS-Preload-Status: unknown. Domain never included in the Preload-list. Check https://hstspreload.org/ to learn some basics about the Google-Preload-List. A Good: Some urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset):2 complete Content-Type - header (4 urls) https://xnxx.net/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Url with incomplete Content-Type - header - missing charset https://www.xnxx.net/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Url with incomplete Content-Type - header - missing charset A http://xnxx.net/ 141.0.173.168 https://xnxx.net/ Correct redirect http - https with the same domain name A http://www.xnxx.net/ 141.0.173.168 https://www.xnxx.net/ Correct redirect http - https with the same domain name B https://xnxx.net/ 141.0.173.168 Missing HSTS-Header B https://www.xnxx.net/ 141.0.173.168 Missing HSTS-Header B https://xnxx.net/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Missing HSTS-Header B https://www.xnxx.net/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Missing HSTS-Header 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. P https://141.0.173.168/ 141.0.173.168 Error creating a TLS-Connection: No more details available. X Fatal error: Nameserver doesn't support TCP connection: ns1.serverstack.com / 141.0.173.126: Timeout X Fatal error: Nameserver doesn't support TCP connection: ns2.serverstack.com / 141.0.168.126: Timeout X Fatal error: Nameserver doesn't support TCP connection: ns3.serverstack.com / 141.0.173.167: Timeout X Fatal error: Nameserver doesn't support TCP connection: ns4.serverstack.com / 141.0.173.125: 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 www.xnxx.net, 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 xnxx.net, 1 ip addresses. A Good: _mta-sts TXT record found (mta-sts: Mail Transfer Agent Strict Transport Security - see RFC 8461). Domainname: _mta-sts.xnxx.net B Bad: _mta-sts TXT found, but invalid 2. Header-Checks F xnxx.net 141.0.173.168 Content-Security-Policy Critical: Missing Header: F xnxx.net 141.0.173.168 X-Content-Type-Options Critical: Missing Header: F xnxx.net 141.0.173.168 Referrer-Policy Critical: Missing Header: F xnxx.net 141.0.173.168 Permissions-Policy Critical: Missing Header: F www.xnxx.net 141.0.173.168 Content-Security-Policy Critical: Missing Header: F www.xnxx.net 141.0.173.168 X-Content-Type-Options Critical: Missing Header: F www.xnxx.net 141.0.173.168 Referrer-Policy Critical: Missing Header: F www.xnxx.net 141.0.173.168 Permissions-Policy Critical: Missing Header: 3. DNS- and NameServer - Checks A Info:: 2 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 4 Name Servers. A Info:: 2 Queries complete, 2 with IPv6, 0 with IPv4. A Good: All DNS Queries done via IPv6. A Good: Some ip addresses of name servers found with the minimum of two DNS Queries. One to find the TLD-Zone, one to ask the TLD-Zone.ns1.serverstack.com (141.0.173.126), ns2.serverstack.com (141.0.168.126), ns3.serverstack.com (141.0.173.167), ns4.serverstack.com (141.0.173.125) A Good (1 - 3.0):: An average of 0.5 queries per domain name server required to find all ip addresses of all name servers. A Info:: 4 different Name Servers found: ns1.serverstack.com, ns2.serverstack.com, ns3.serverstack.com, ns4.serverstack.com, 4 Name Servers included in Delegation: ns1.serverstack.com, ns2.serverstack.com, ns3.serverstack.com, ns4.serverstack.com, 2 Name Servers included in 1 Zone definitions: ns1.serverstack.com, ns2.serverstack.com, 1 Name Servers listed in SOA.Primary: ns1.serverstack.com. A Good: Only one SOA.Primary Name Server found.: ns1.serverstack.com. A Good: SOA.Primary Name Server included in the delegation set.: ns1.serverstack.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.serverstack.com (141.0.173.126): Delegation: ns1.serverstack.com, ns2.serverstack.com, ns3.serverstack.com, ns4.serverstack.com, Zone: ns1.serverstack.com, ns2.serverstack.com. Name Servers defined in Delegation, missing in Zone: ns3.serverstack.com, ns4.serverstack.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.serverstack.com (141.0.168.126): Delegation: ns1.serverstack.com, ns2.serverstack.com, ns3.serverstack.com, ns4.serverstack.com, Zone: ns1.serverstack.com, ns2.serverstack.com. Name Servers defined in Delegation, missing in Zone: ns3.serverstack.com, ns4.serverstack.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.: ns3.serverstack.com (141.0.173.167): Delegation: ns1.serverstack.com, ns2.serverstack.com, ns3.serverstack.com, ns4.serverstack.com, Zone: ns1.serverstack.com, ns2.serverstack.com. Name Servers defined in Delegation, missing in Zone: ns3.serverstack.com, ns4.serverstack.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.: ns4.serverstack.com (141.0.173.125): Delegation: ns1.serverstack.com, ns2.serverstack.com, ns3.serverstack.com, ns4.serverstack.com, Zone: ns1.serverstack.com, ns2.serverstack.com. Name Servers defined in Delegation, missing in Zone: ns3.serverstack.com, ns4.serverstack.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: No Name Server IPv6 address found. IPv6 is the future, so your name servers should be visible via IPv6.: 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 Warning: All Name Servers have the same domain name. If there is a problem with that domain name (or with the name servers of that domain name), your domain may be affected. Better: Use Name Servers with different domain names / different top level domains.: Only one domain name used: serverstack.com Warning: All Name Servers from the same Country / IP location.: 4 Name Servers, 1 Countries: NL A Info: Ipv4-Subnet-list: 4 Name Servers, 1 different subnets (first Byte): 141., 1 different subnets (first two Bytes): 141.0., 2 different subnets (first three Bytes): 141.0.168., 141.0.173. A Good: Name Server IPv4-addresses from different subnet found: A Good: Nameserver supports Echo Capitalization: 4 good Nameserver A Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 4 good Nameserver 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 A Good: All checks /.well-known/acme-challenge/random-filename without redirects answer with the expected http status 404 - Not Found. Creating a Letsencrypt certificate via http-01 challenge should work. If it doesn't work: Check your vHost configuration (apachectl -S, httpd -S, nginx -T). Every combination of port and ServerName / ServerAlias (Apache) or Server (Nginx) must be unique. Merge duplicated entries in one vHost. If you use an IIS, extensionless files must be allowed in the /.well-known/acme-challenge subdirectory. Create a web.config in that directory. Content: <configuration><system.webServer><staticContent><mimeMap fileExtension="." mimeType="text/plain" /></staticContent></system.webServer></configuration>. If you have a redirect http ⇒ https, that's ok, Letsencrypt follows such redirects to port 80 / 443 (same or other server). There must be a certificate. But the certificate may be expired, self signed or with a not matching domain name. Checking the validation file Letsencrypt ignores such certificate errors. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask. A Good: Every https result with status 200 supports GZip. https://xnxx.net/ 141.0.173.168 Warning: Https result with status 200 found, Html-Content is too big. Should be max. 110 %. May contain inline CSS / JavaScript, too much comments or white space. Re-used ressources - create files with a long Cache-Control max-age header. Remove comments and white space. https://www.xnxx.net/ 141.0.173.168 Warning: Https result with status 200 found, Html-Content is too big. Should be max. 110 %. May contain inline CSS / JavaScript, too much comments or white space. Re-used ressources - create files with a long Cache-Control max-age header. Remove comments and white space. A Good: Every https connection via port 443 supports the http/2 protocol via ALPN. 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 https://xnxx.net/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 2.793 seconds Warning: 404 needs more then one second https://www.xnxx.net/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 2.677 seconds Warning: 404 needs more then one second A Info: Different Server-Headers found A Duration: 552614 milliseconds, 552.614 seconds