1. General Results, most used to calculate the result A name "map.vodaplay.vn" is subdomain, public suffix is ".vn", top-level-domain is ".vn", top-level-domain-type is "country-code", Country is Viet Nam, tld-manager is "Ministry of Information and Communications of Socialist Republic of Viet Nam", num .vn-domains preloaded: 321 (complete: 231048) A Good: All ip addresses are public addresses A Good: No asked Authoritative Name Server had a timeout A Good: one preferred version: non-www is preferred 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):0 complete Content-Type - header (4 urls) http://map.vodaplay.vn/ 103.9.159.82 Url with incomplete Content-Type - header - missing charset https://map.vodaplay.vn/ 103.9.159.82 Url with incomplete Content-Type - header - missing charset http://map.vodaplay.vn/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 103.9.159.82 Url with incomplete Content-Type - header - missing charset https://103.9.159.82/ 103.9.159.82 Url with incomplete Content-Type - header - missing charset B https://map.vodaplay.vn/ 103.9.159.82 Missing HSTS-Header H Fatal error: http result with http-status 200, no encryption. Add a redirect http ⇒ https, so every connection is secure. Perhaps in your port 80 vHost something like "RewriteEngine on" + "RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,QSA,R=permanent]" (two rows, without the "). Don't add this in your port 443 vHost, that would create a loop. N https://map.vodaplay.vn/ 103.9.159.82 Error - Certificate isn't trusted, RemoteCertificateNameMismatch N https://103.9.159.82/ 103.9.159.82 Error - Certificate isn't trusted, RemoteCertificateNameMismatch X Fatal error: Nameserver doesn't support TCP connection: e.dns-servers.vn: Timeout X Fatal error: Nameserver doesn't support TCP connection: ns1.vnso.vn / 103.9.156.250: Refused X Fatal error: Nameserver doesn't support TCP connection: ns2.vnso.vn / 103.98.152.209: Refused X Fatal error: Nameserver doesn't support TCP connection: ns4.zonedns.vn / 103.28.39.159: Fatal error (-14). Details: Unable to read data from the transport connection: Ein Verbindungsversuch ist fehlgeschlagen, da die Gegenstelle nach einer bestimmten Zeitspanne nicht richtig reagiert hat, oder die hergestellte Verbindung war fehlerhaft, da der verbundene Host nicht reagiert hat. - Ein Verbindungsversuch ist fehlgeschlagen, da die Gegenstelle nach einer bestimmten Zeitspanne nicht richtig reagiert hat, oder die hergestellte Verbindung war fehlerhaft, da der verbundene Host nicht reagiert hat 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.map.vodaplay.vn 2. Header-Checks F map.vodaplay.vn 103.9.159.82 Content-Security-Policy Critical: Missing Header: F map.vodaplay.vn 103.9.159.82 X-Content-Type-Options Critical: Missing Header: F map.vodaplay.vn 103.9.159.82 Referrer-Policy Critical: Missing Header: F map.vodaplay.vn 103.9.159.82 Permissions-Policy Critical: Missing Header: 3. DNS- and NameServer - Checks A Info:: 26 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 6 Name Servers. A Info:: 26 Queries complete, 18 with IPv6, 8 with IPv4. Warning: Only some DNS Queries done via ipv6. IPv6 is the future, so the name servers of your name servers should have ipv6 addresses. Ok (4 - 8):: An average of 4.3 queries per domain name server required to find all ip addresses of all name servers. A Info:: 6 different Name Servers found: ns1.vnso.vn, ns1.zonedns.vn, ns2.vnso.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn, 4 Name Servers included in Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, 4 Name Servers included in 2 Zone definitions: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn, 1 Name Servers listed in SOA.Primary: ns1.zonedns.vn. A Good: Only one SOA.Primary Name Server found.: ns1.zonedns.vn. Error: SOA.Primary Name Server not included in the delegation set.: ns1.zonedns.vn. 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.zonedns.vn (125.212.225.141): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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.zonedns.vn (2401:5f80:2001:5::a): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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.zonedns.vn (103.176.178.51): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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.zonedns.vn (2401:5f80:2001:5::a): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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.zonedns.vn (103.28.36.30): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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.zonedns.vn (2001:df1:3200::15): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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.zonedns.vn (103.28.39.159): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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.zonedns.vn (2001:df1:3200::15): Delegation: ns1.vnso.vn, ns2.vnso.vn, ns3.zonedns.vn, ns4.zonedns.vn, Zone: ns1.zonedns.vn, ns2.zonedns.vn, ns3.zonedns.vn, ns4.zonedns.vn. Name Servers defined in Delegation, missing in Zone: ns1.vnso.vn, ns2.vnso.vn.Name Servers defined in Zone, missing in Delegation: ns1.zonedns.vn, ns2.zonedns.vn. 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 Info: Ipv4-Subnet-list: 6 Name Servers, 2 different subnets (first Byte): 103., 125., 5 different subnets (first two Bytes): 103.176., 103.28., 103.9., 103.98., 125.212., 6 different subnets (first three Bytes): 103.176.178., 103.28.36., 103.28.39., 103.9.156., 103.98.152., 125.212.225. A Good: Name Server IPv4-addresses from different subnet found: A Info: IPv6-Subnet-list: 4 Name Servers with IPv6, 2 different subnets (first block): 2001:, 2401:, 2 different subnets (first two blocks): 2001:0df1:, 2401:5f80:, 2 different subnets (first three blocks): 2001:0df1:3200:, 2401:5f80:2001:, 2 different subnets (first four blocks): 2001:0df1:3200:0000:, 2401:5f80:2001:0005: A Good: Name Server IPv6 addresses from different subnets found. A Good: Nameserver supports Echo Capitalization: 10 good Nameserver X Nameserver Timeout checking Echo Capitalization: c.dns-servers.vn X Nameserver Timeout checking Echo Capitalization: h.dns-servers.vn A Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 10 good Nameserver X Nameserver Timeout checking EDNS512: c.dns-servers.vn X Nameserver Timeout checking EDNS512: h.dns-servers.vn Nameserver doesn't pass all EDNS-Checks: b.dns-servers.vn: 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: c.dns-servers.vn: 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: dns-master.vnnic.vn: 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: e.dns-servers.vn: OP100: ok. FLAGS: ok. V1: fatal timeout. V1OP100: ok. V1FLAGS: ok. DNSSEC: fatal timeout. V1DNSSEC: ok. NSID: fatal timeout. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: f.dns-servers.vn: OP100: fatal timeout. 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: h.dns-servers.vn: OP100: fatal timeout. 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: ns1.vnso.vn / 103.9.156.250: OP100: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. FLAGS: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. V1DNSSEC: ok. NSID: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. COOKIE: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: ns2.vnso.vn / 103.98.152.209: OP100: fatal timeout. FLAGS: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. V1DNSSEC: fatal timeout. NSID: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. COOKIE: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: ns2.zonedns.vn / 103.176.178.51: OP100: ok. FLAGS: fatal timeout. 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 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: No https + http status 200 with inline CSS / JavaScript found A Good: Every https result with status 200 has a minified Html-Content with a quota lower then 110 %. https://map.vodaplay.vn/ 103.9.159.82 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://103.9.159.82/ 103.9.159.82 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 Good: All script Elements (type text/javascript) and src-Attribute have a defer / async - Attribute. So loading and executing these JavaScripts doesn't block parsing and rendering the Html-Output. Warning: CSS / JavaScript found without GZip support. Send these ressources with GZip. 4 external CSS / JavaScript files without GZip found - 0 with GZip, 4 complete Warning: CSS / JavaScript files with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 8 external CSS / JavaScript files without Cache-Control-Header, 0 with Cache-Control, but no max-age, 0 with Cache-Control max-age too short (minimum 7 days), 0 with Cache-Control long enough, 8 complete. A Good: All checked attribute values are enclosed in quotation marks (" or '). 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: 328664 milliseconds, 328.664 seconds