1. General Results, most used to calculate the result A name "crimsonx.online" is domain, public suffix is "online", top-level-domain-type is "generic", tld-manager is "DotOnline Inc." A good: All ip addresses are public addresses A Good: Minimal 2 ip addresses per domain name found: crimsonx.online has 4 different ip addresses (authoritative). A Good: Minimal 2 ip addresses per domain name found: www.crimsonx.online has 4 different ip addresses (authoritative). 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: crimsonx.online 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.crimsonx.online has no ipv6 address. A good: No asked Authoritative Name Server had a timeout 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):8 complete Content-Type - header (16 urls) http://crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.197 Url with incomplete Content-Type - header - missing charset http://crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.198 Url with incomplete Content-Type - header - missing charset http://crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.199 Url with incomplete Content-Type - header - missing charset http://crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.200 Url with incomplete Content-Type - header - missing charset http://www.crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.197 Url with incomplete Content-Type - header - missing charset http://www.crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.198 Url with incomplete Content-Type - header - missing charset http://www.crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.199 Url with incomplete Content-Type - header - missing charset http://www.crimsonx.online/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 198.54.117.200 Url with incomplete Content-Type - header - missing charset 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. H fatal error: No https - result with http-status 200, no encryption 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. V https://crimsonx.online/ 198.54.117.197 connect failure - perhaps firewall V https://crimsonx.online/ 198.54.117.198 connect failure - perhaps firewall V https://crimsonx.online/ 198.54.117.199 connect failure - perhaps firewall V https://crimsonx.online/ 198.54.117.200 connect failure - perhaps firewall V https://www.crimsonx.online/ 198.54.117.197 connect failure - perhaps firewall V https://www.crimsonx.online/ 198.54.117.198 connect failure - perhaps firewall V https://www.crimsonx.online/ 198.54.117.199 connect failure - perhaps firewall V https://www.crimsonx.online/ 198.54.117.200 connect failure - perhaps firewall V https://198.54.117.197/ 198.54.117.197 connect failure - perhaps firewall V https://198.54.117.198/ 198.54.117.198 connect failure - perhaps firewall V https://198.54.117.199/ 198.54.117.199 connect failure - perhaps firewall V https://198.54.117.200/ 198.54.117.200 connect failure - perhaps firewall 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 crimsonx.online, 4 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.crimsonx.online, 4 ip addresses. 2. DNS- and NameServer - Checks A Info:: 37 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 2 Name Servers. A Info:: 37 Queries complete, 37 with IPv6, 0 with IPv4. A Good: All DNS Queries done via IPv6. Bad (greater 8):: An average of 18.5 queries per domain name server required to find all ip addresses of all name servers. A Info:: 2 different Name Servers found: dns101.registrar-servers.com, dns102.registrar-servers.com, 2 Name Servers included in Delegation: dns101.registrar-servers.com, dns102.registrar-servers.com, 2 Name Servers included in 1 Zone definitions: dns101.registrar-servers.com, dns102.registrar-servers.com, 1 Name Servers listed in SOA.Primary: dns101.registrar-servers.com. A Good: Only one SOA.Primary Name Server found.: dns101.registrar-servers.com. A Good: SOA.Primary Name Server included in the delegation set.: dns101.registrar-servers.com. A Good: Consistency 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. Ordered list of name servers: dns101.registrar-servers.com, dns102.registrar-servers.com A Good: All Name Server Domain Names have a Public Suffix. A Good: Minimal 2 different name servers (public suffix and public ip address) found: 2 different Name Servers found Warning: No Name Server IPv6 address found. IPv6 is the future, so your name servers should be visible via IPv6.: 2 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.: 2 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: registrar-servers.com Warning: All Name Servers from the same Country / IP location.: 2 Name Servers, 1 Countries: US A A Good: Nameserver supports TCP connections: 2 good Nameserver A Good: Nameserver supports Echo Capitalization: 2 good Nameserver A Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 2 good Nameserver Nameserver doesn't pass all EDNS-Checks: d.nic.online: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found (hivecast-2-defra.as15135.net Radix-D). COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: dns101.registrar-servers.com: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: dns101.registrar-servers.com / 198.54.117.253: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: dns102.registrar-servers.com: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: dns102.registrar-servers.com / 198.54.117.254: OP100: ok. FLAGS: ok. V1: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. V1OP100: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found, no OPT100 expected, no OPT100 found. V1FLAGS: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. DNSSEC: ok. V1DNSSEC: SOA NOT expected, but found, BADVER expected, NOERR found, Version 0 expectend and found. NSID: ok. COOKIE: ok. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: ns0.centralnic.net: 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. 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. 3. 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 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: 86230 milliseconds, 86.230 seconds