1. General Results, most used to calculate the result A name "arbitrarysolutions.com" is domain, public suffix is "com", top-level-domain-type is "generic", tld-manager is "VeriSign Global Registry Services" A good: All ip addresses are public addresses 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. http://arbitrarysolutions.com/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 156.67.222.225 Url with incomplete Content-Type - header - missing charset http://www.arbitrarysolutions.com/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 156.67.222.225 Url with incomplete Content-Type - header - missing charset C Error - no version with Http-Status 200 H fatal error: No https - result with http-status 200, no encryption J Fatal: BitNinja.io found. That tool blocks "check your website". So a complete check isn't possible. Deactivate or remove BitNinja if you want to check your domain. Ask BitNinja why this helpful tool is blocked. Your domain is now 28 days blocked. M http://arbitrarysolutions.com/ 156.67.222.225 Misconfiguration - main pages should never send http status 400 - 499 M http://www.arbitrarysolutions.com/ 156.67.222.225 Misconfiguration - main pages should never send http status 400 - 499 V https://arbitrarysolutions.com/ 156.67.222.225 connect failure - perhaps firewall V https://www.arbitrarysolutions.com/ 156.67.222.225 connect failure - perhaps firewall 2. DNS- and NameServer - Checks 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: ns1.dns-parking.com,ns2.dns-parking.com A Good: Nameserver supports TCP connections: 4 good Nameserver A Good: Nameserver supports Echo Capitalization: 4 good Nameserver X Nameserver Timeout checking Echo Capitalization: e.gtld-servers.net A Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 4 good Nameserver A Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 4 good Nameserver Nameserver doesn't pass all EDNS-Checks: k.gtld-servers.net: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: fatal timeout. CLIENTSUBNET: ok. A Good: All SOA have the same Serial Number A good: CAA entries found, creating certificate is limited: comodoca.com is allowed to create certificates A good: CAA entries found, creating certificate is limited: digicert.com is allowed to create certificates A good: CAA entries found, creating certificate is limited: globalsign.com is allowed to create certificates A good: CAA entries found, creating certificate is limited: letsencrypt.org is allowed to create certificates A good: CAA entries found, creating certificate is limited: comodoca.com is allowed to create wildcard-certificates A good: CAA entries found, creating certificate is limited: digicert.com is allowed to create wildcard-certificates A good: CAA entries found, creating certificate is limited: globalsign.com is allowed to create wildcard-certificates A good: CAA entries found, creating certificate is limited: letsencrypt.org is allowed to create wildcard-certificates 3. Content- and Performance-critical Checks http://arbitrarysolutions.com/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 156.67.222.225 Fatal: Check of /.well-known/acme-challenge/random-filename has a http status 401 / 403 Not Allowed / Forbidden. A http status 404 - Not Found - is expected. Creating a Letsencrypt certificate via http-01 challenge may not work. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask. http://www.arbitrarysolutions.com/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 156.67.222.225 Fatal: Check of /.well-known/acme-challenge/random-filename has a http status 401 / 403 Not Allowed / Forbidden. A http status 404 - Not Found - is expected. Creating a Letsencrypt certificate via http-01 challenge may not work. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask. 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: 42357 milliseconds, 42.357 seconds