1. General Results, most used to calculate the result A name "c.apple.com" is subdomain, public suffix is ".com", top-level-domain is ".com", top-level-domain-type is "generic", tld-manager is "VeriSign Global Registry Services", num .com-domains preloaded: 85538 (complete: 220007) A Good: All ip addresses are public addresses Warning: Only one ip address found: c.apple.com 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: c.apple.com has no ipv6 address. A Good: No asked Authoritative Name Server had a timeout A DNS: "Name Error" means: No www-dns-entry defined. This isn't a problem A Good: one preferred version: non-www is preferred 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):1 complete Content-Type - header (7 urls) http://c.apple.com/ 17.171.49.147 Url with incomplete Content-Type - header - missing charset http://c.apple.com/ 17.179.240.53 Url with incomplete Content-Type - header - missing charset https://c.apple.com/ 17.171.49.147 Url with incomplete Content-Type - header - missing charset https://c.apple.com/ 17.179.240.53 Url with incomplete Content-Type - header - missing charset https://17.171.49.147/ 17.171.49.147 Url with incomplete Content-Type - header - missing charset https://17.179.240.53/ 17.179.240.53 Url with incomplete Content-Type - header - missing charset B https://c.apple.com/ 17.171.49.147 Missing HSTS-Header B https://c.apple.com/ 17.179.240.53 Missing HSTS-Header http://www.apple.com/error geo=DE; path=/; domain=.apple.com Fatal: Cookie sent via http. Never send Cookies / Session-Cookies via http. If a user uses an insecure WLan and if the same cookie is used to managed the authenticated session, it's possible to hack that user. Same with HttpOnly - without https that's only decorative. B https://www.apple.com/error geo=DE; path=/; domain=.apple.com Cookie sent via https, but not marked as secure B http://www.apple.com/error geo=DE; path=/; domain=.apple.com Cookie without a SameSite-Attribute. Possible values are: Strict/Lax/None. Cookie may not work as expected, if "None" is wanted, but browsers use "Lax" as default value. B https://www.apple.com/error geo=DE; path=/; domain=.apple.com Cookie without a SameSite-Attribute. Possible values are: Strict/Lax/None. Cookie may not work as expected, if "None" is wanted, but browsers use "Lax" as default value. D http://c.apple.com/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 17.171.49.147 http://www.apple.com/error Wrong redirect one domain http to other domain http. First redirect to https without changing the domain, so no new dns query is required. So the server can send the HSTS header. That's fundamental using HSTS (Http Strict Transport Security). First step: Add correct redirects http ⇒ https. 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. Then recheck your domain, should be Grade C. There is the rule to select one https version as preferred version. D http://c.apple.com/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 17.179.240.53 http://www.apple.com/error Wrong redirect one domain http to other domain http. First redirect to https without changing the domain, so no new dns query is required. So the server can send the HSTS header. That's fundamental using HSTS (Http Strict Transport Security). First step: Add correct redirects http ⇒ https. 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. Then recheck your domain, should be Grade C. There is the rule to select one https version as preferred version. 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. I https://c.apple.com/ 17.171.49.147 Content problems or problems with resources included - http links, files doesn't exist, different Content-Type definitions. Check the Html-Content - Part. I https://c.apple.com/ 17.179.240.53 Content problems or problems with resources included - http links, files doesn't exist, different Content-Type definitions. Check the Html-Content - Part. I https://www.apple.com/error Content problems or problems with resources included - http links, files doesn't exist, different Content-Type definitions. Check the Html-Content - Part. M https://17.171.49.147/ 17.171.49.147 Misconfiguration - main pages should never send http status 400 - 499 M https://17.179.240.53/ 17.179.240.53 Misconfiguration - main pages should never send http status 400 - 499 N https://17.171.49.147/ 17.171.49.147 Error - Certificate isn't trusted, RemoteCertificateNameMismatch N https://17.179.240.53/ 17.179.240.53 Error - Certificate isn't trusted, RemoteCertificateNameMismatch O c.apple.com / 17.171.49.147 / 443 Old connection: Cipher Suites without Forward Secrecy (FS) found. Remove all of these Cipher Suites, use only Cipher Suites with Forward Secrecy: Starting with ECDHE- or DHE - the last "E" says: "ephemeral". Or use Tls.1.3, then all Cipher Suites use FS. 10 Cipher Suites without Forward Secrecy found Info: Checking all ip addresses of that domain without sending the hostname only one certificate found. Checking all ip addresses and sending the hostname only one certificate found. Both certificates are the same. So that domain doesn't require Server Name Indication (SNI), it's the primary certificate of that set of ip addresses.: Domain c.apple.com, 1 ip addresses, 1 different http results. 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.c.apple.com 2. Header-Checks (alpha, started 2022-10-23, may be buggy / incomplete) A c.apple.com 17.171.49.147 X-Frame-Options Ok: Header without syntax errors found: SAMEORIGIN B Info: Header is deprecated. May not longer work in modern browsers. SAMEORIGIN. Better solution: Use a Content-Security-Policy Header with a frame-ancestors directive. DENY - use 'none', SAMEORIGIN - use 'self'. If you want to allow some domains to frame your page, add these urls. A c.apple.com 17.179.240.53 X-Frame-Options Ok: Header without syntax errors found: SAMEORIGIN B Info: Header is deprecated. May not longer work in modern browsers. SAMEORIGIN. Better solution: Use a Content-Security-Policy Header with a frame-ancestors directive. DENY - use 'none', SAMEORIGIN - use 'self'. If you want to allow some domains to frame your page, add these urls. F c.apple.com 17.171.49.147 Content-Security-Policy Critical: Missing Header: F c.apple.com 17.171.49.147 X-Content-Type-Options Critical: Missing Header: F c.apple.com 17.171.49.147 Referrer-Policy Critical: Missing Header: F c.apple.com 17.171.49.147 Permissions-Policy Critical: Missing Header: F c.apple.com 17.179.240.53 Content-Security-Policy Critical: Missing Header: F c.apple.com 17.179.240.53 X-Content-Type-Options Critical: Missing Header: F c.apple.com 17.179.240.53 Referrer-Policy Critical: Missing Header: F c.apple.com 17.179.240.53 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.a.ns.apple.com (17.253.200.1, 2620:149:ae0::53), b.ns.apple.com (17.253.207.1, 2620:149:ae7::53), c.ns.apple.com (204.19.119.1, 2620:171:800:714::1), d.ns.apple.com (204.26.57.1, 2620:171:801:714::1) 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:: 5 different Name Servers found: a.ns.apple.com, b.ns.apple.com, c.ns.apple.com, d.ns.apple.com, usmsc2-extxfr-001.dns.apple.com, 4 Name Servers included in Delegation: a.ns.apple.com, b.ns.apple.com, c.ns.apple.com, d.ns.apple.com, 4 Name Servers included in 2 Zone definitions: a.ns.apple.com, b.ns.apple.com, c.ns.apple.com, d.ns.apple.com, 1 Name Servers listed in SOA.Primary: usmsc2-extxfr-001.dns.apple.com. A Good: Only one SOA.Primary Name Server found.: usmsc2-extxfr-001.dns.apple.com. Error: SOA.Primary Name Server not included in the delegation set.: usmsc2-extxfr-001.dns.apple.com. A Good: All Name Server Domain Names have a Public Suffix. Error: Name Server Domain Names with Public Suffix and without ip address found.: 1 Name Servers without ipv4 and ipv6: 1 A Info: Ipv4-Subnet-list: 4 Name Servers, 2 different subnets (first Byte): 17., 204., 3 different subnets (first two Bytes): 17.253., 204.19., 204.26., 4 different subnets (first three Bytes): 17.253.200., 17.253.207., 204.19.119., 204.26.57. 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): 2620:, 2 different subnets (first two blocks): 2620:0149:, 2620:0171:, 4 different subnets (first three blocks): 2620:0149:0ae0:, 2620:0149:0ae7:, 2620:0171:0800:, 2620:0171:0801:, 4 different subnets (first four blocks): 2620:0149:0ae0:0000:, 2620:0149:0ae7:0000:, 2620:0171:0800:0714:, 2620:0171:0801:0714: A Good: Name Server IPv6 addresses from different subnets found. A Good: Nameserver supports TCP connections: 16 good Nameserver A Good: Nameserver supports Echo Capitalization: 16 good Nameserver X Nameserver Timeout checking Echo Capitalization: a13-130.akagtm.org / 2.22.230.130 X Nameserver Timeout checking Echo Capitalization: a9-128.akadns.net / 184.85.248.128 A Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 16 good Nameserver Nameserver doesn't pass all EDNS-Checks: a13-130.akagtm.org / 2.22.230.130: 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: a9-128.akadns.net / 184.85.248.128: 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: internal.akadns.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. Nameserver doesn't pass all EDNS-Checks: internal.akadns.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. Nameserver doesn't pass all EDNS-Checks: internal.akadns.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. Nameserver doesn't pass all EDNS-Checks: internal.akadns.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. Nameserver doesn't pass all EDNS-Checks: usmsc2-extxfr-001.dns.apple.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: usmsc2-extxfr-001.dns.apple.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: usmsc2-extxfr-001.dns.apple.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. A Good: All SOA have the same Serial Number A Good: CAA entries found, creating certificate is limited: entrust.net is allowed to create certificates A Good: CAA entries found, creating certificate is limited: pki.apple.com is allowed to create certificates 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 https://c.apple.com/ 17.171.49.147 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://c.apple.com/ 17.179.240.53 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://c.apple.com/ 17.171.49.147 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://c.apple.com/ 17.179.240.53 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.apple.com/error Critical: Some script Elements (type text/javascript) with a src-Attribute don't have a defer / async - Attribute. Loading and executing these JavaScripts blocks parsing and rendering the Html-Output. That's bad if your site is large or the connection is slow / mobile usage. Use "async" if the js file has only functions (so nothing is executed after parsing the file) or is independend. Use "defer" if the order of the scripts is important. All "defer" scripts are executed before the DOMContentLoaded event is fired. Check https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script to see some details.: 7 script elements without defer/async. Warning: CSS / JavaScript found without GZip support. Send these ressources with GZip. 3 external CSS / JavaScript files without GZip found - 10 with GZip, 13 complete Warning: CSS / JavaScript files with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 0 external CSS / JavaScript files without Cache-Control-Header, 0 with Cache-Control, but no max-age, 13 with Cache-Control max-age too short (minimum 7 days), 0 with Cache-Control long enough, 13 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 https://www.apple.com/error 4.054 seconds Warning: 404 needs more then one second A Info: Different Server-Headers found A Duration: 518447 milliseconds, 518.447 seconds