1. General Results, most used to calculate the result A name "vdrblaubart.dynvpn.de" is domain, public suffix is ".dynvpn.de", top-level-domain is ".de", top-level-domain-type is "country-code", Country is Germany, tld-manager is "DENIC eG", num .de-domains preloaded: 8467 (complete: 210599) A Good: All ip addresses are public addresses A https://vdrblaubart.dynvpn.de/ 5.100.142.142 https://vdrblaubart.dynvpn.de/login Correct redirect https to https A Good: destination is https A Good - only one version with Http-Status 200 A Good: one preferred version: non-www is preferred A Good: No cookie sent via http. A Good: every cookie sent via https is marked as secure A Good: Every cookie has a SameSite Attribute with a correct value Strict/Lax/None 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 (2 urls) https://vdrblaubart.dynvpn.de/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Url with incomplete Content-Type - header - missing charset A http://vdrblaubart.dynvpn.de/ 5.100.142.142 https://vdrblaubart.dynvpn.de/ Correct redirect http - https with the same domain name B Warning: HSTS max-age is too short - minimum 31536000 = 365 days required, 15768000 seconds = 182 days found B https://vdrblaubart.dynvpn.de/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Missing HSTS-Header B https://vdrblaubart.dynvpn.de/ 5.100.142.142 max-age=15768000; includeSubDomains; preload; Critical: HSTS-Header has Parse-Errors. Empty entry, remove the semicolon at the end., Value of max-age is too small. Should be minimal one year = 31536000., Unknown directive found. Only max-age (with value), includeSubdomains or preload allowed. B https://vdrblaubart.dynvpn.de/login max-age=15768000; includeSubDomains; preload; Critical: HSTS-Header has Parse-Errors. Empty entry, remove the semicolon at the end., Value of max-age is too small. Should be minimal one year = 31536000., Unknown directive found. Only max-age (with value), includeSubdomains or preload allowed. M https://5.100.142.142/ 5.100.142.142 Misconfiguration - main pages should never send http status 400 - 499 N https://vdrblaubart.dynvpn.de/ 5.100.142.142 https://vdrblaubart.dynvpn.de/login Error - Certificate isn't trusted, RemoteCertificateChainErrors N https://vdrblaubart.dynvpn.de/login Error - Certificate isn't trusted, RemoteCertificateChainErrors N https://vdrblaubart.dynvpn.de/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Error - Certificate isn't trusted, RemoteCertificateChainErrors N https://5.100.142.142/ 5.100.142.142 Error - Certificate isn't trusted, RemoteCertificateNameMismatch, RemoteCertificateChainErrors X Fatal error: Nameserver doesn't support TCP connection: h2-045.net.crns.de / 83.246.77.45: Timeout 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.vdrblaubart.dynvpn.de 2. Header-Checks A vdrblaubart.dynvpn.de Content-Security-Policy Ok: Header without syntax errors found: default-src 'none';base-uri 'none';manifest-src 'self';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;font-src 'self' data:;connect-src 'self';media-src 'self';frame-src 'self';frame-ancestors 'self';worker-src 'self' blob:;form-action 'self' A Good: default-src directive only with 'none' or 'self', additional sources are blocked. A Good: default-src without 'unsafe-inline' or 'unsave-eval'. A Good: form-action directive found. That reduces the risk sending data to unwanted domains. form-action is a navigation-directive, so default-src isn't used. A Good: frame-ancestors directive found. That limits pages who are allowed to use this page in a frame / iframe / object / embed / applet. frame-ancestors is a navigation-directive, so default-src isn't used. A Good: base-uri directive found. That limits the URLs which can be used in a document's <base> element. Because it's a document directive, default-src isn't used, so an own directive is required. A Good: No object-src found, but the default-src used as fallback is defined and restricted. A Good: script-src without 'unsafe-inline' and 'unsafe-eval' found. That's the recommended configuration. A Good: script-src without * and a scheme found. A Good: script-src without data: schema found. Why is this important? The data: schema allows hidden code injection. Insert <script src='data:application/javascript;base64,YWxlcnQoJ1hTUycpOw=='></script> in your page and see what happens. A Good: frame-src without data: defined or frame-src missing and the default-src used as fallback not allows the data: schema. That blocks hidden code injection. Insert <iframe src="data:text/html;charset=utf-8;base64,PCFET0NUWVBFIGh0bWw+PGh0bWw+PGJvZHk+PHA+YmVmb3JlPHNjcmlwdCB0eXBlPSJ0ZXh0L2phdmFzY3JpcHQiPmFsZXJ0KCdYU1MnKTwvc2NyaXB0PjxwPmFmdGVyPC9ib2R5PjwvaHRtbD4="></iframe> in your page and see what happens. A X-Content-Type-Options Ok: Header without syntax errors found: nosniff A Referrer-Policy Ok: Header without syntax errors found: no-referrer A Feature-Policy Ok: Header without syntax errors found: autoplay 'self';camera 'none';fullscreen 'self';geolocation 'none';microphone 'none';payment 'none' B Info: Header is deprecated. May not longer work in modern browsers. autoplay 'self';camera 'none';fullscreen 'self';geolocation 'none';microphone 'none';payment 'none' A X-Xss-Protection Ok: Header without syntax errors found: 1; mode=block B Info: Header is deprecated. May not longer work in modern browsers. 1; mode=block F vdrblaubart.dynvpn.de Permissions-Policy Critical: Missing Header: 3. DNS- and NameServer - Checks A A A Info:: 6 different Name Servers found: a.nic.de, f.nic.de, l.de.net, n.de.net, s.de.net, z.nic.de, 6 Name Servers included in Delegation: a.nic.de, f.nic.de, l.de.net, n.de.net, s.de.net, z.nic.de, 6 Name Servers included in 1 Zone definitions: a.nic.de, f.nic.de, l.de.net, n.de.net, s.de.net, z.nic.de, 1 Name Servers listed in SOA.Primary: f.nic.de. A Good: Only one SOA.Primary Name Server found.: f.nic.de. A Good: SOA.Primary Name Server included in the delegation set.: f.nic.de. A Good: All Name Server Domain Names have a Public Suffix. A X Nameserver Timeout checking Echo Capitalization: h2-045.net.crns.de / 83.246.77.45 X Nameserver Timeout checking Echo Capitalization: ns2.crns.de / 83.246.76.144 X Nameserver Timeout checking EDNS512: h2-045.net.crns.de / 83.246.77.45 X Nameserver Timeout checking EDNS512: ns2.crns.de / 83.246.76.144 Nameserver doesn't pass all EDNS-Checks: h2-045.net.crns.de / 83.246.77.45: OP100: fatal timeout. FLAGS: fatal timeout. V1: fatal timeout. V1OP100: fatal timeout. V1FLAGS: fatal timeout. DNSSEC: fatal timeout. V1DNSSEC: fatal timeout. NSID: fatal timeout. COOKIE: fatal timeout. CLIENTSUBNET: fatal timeout. Nameserver doesn't pass all EDNS-Checks: n.de.net: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: fatal timeout. V1DNSSEC: ok. NSID: ok (s3.sof). COOKIE: fatal timeout. CLIENTSUBNET: ok. Nameserver doesn't pass all EDNS-Checks: ns2.crns.de / 83.246.76.144: OP100: fatal timeout. FLAGS: fatal timeout. V1: fatal timeout. V1OP100: fatal timeout. V1FLAGS: fatal timeout. DNSSEC: fatal timeout. V1DNSSEC: fatal timeout. NSID: fatal timeout. COOKIE: fatal timeout. CLIENTSUBNET: fatal timeout. 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. 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 %. A Good: Every https connection via port 443 supports the http/2 protocol via ALPN. 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. 2 external CSS / JavaScript files without GZip found - 17 with GZip, 19 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, 1 with Cache-Control, but no max-age, 1 with Cache-Control max-age too short (minimum 7 days), 17 with Cache-Control long enough, 19 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://vdrblaubart.dynvpn.de/ 5.100.142.142 Strict-Transport-Security: max-age=15768000; includeSubDomains; preload; Parse Error - Header can't be parsed https://vdrblaubart.dynvpn.de/login Strict-Transport-Security: max-age=15768000; includeSubDomains; preload; Parse Error - Header can't be parsed https://vdrblaubart.dynvpn.de/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 2.633 seconds Warning: 404 needs more then one second A Duration: 145546 milliseconds, 145.546 seconds