| 1. General Results, most used to calculate the result |
| A | name "changelog.so" is domain, public suffix is ".so", top-level-domain is ".so", top-level-domain-type is "country-code", Country is Somalia, tld-manager is "Ministry of Post and Telecommunications", num .so-domains preloaded: 19 (complete: 151507)
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| A | Good: All ip addresses are public addresses
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| Warning: Only one ip address found: changelog.so has only one ip address.
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| Warning: Only one ip address found: www.changelog.so has only one ip address.
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| 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: changelog.so has no ipv6 address.
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| 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.changelog.so has no ipv6 address.
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| A | Good: No asked Authoritative Name Server had a timeout
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| A | https://76.76.21.21/ 76.76.21.21
| https://vercel.com/
| Correct redirect https to https
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| A | Good: destination is https
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| A | Good - only one version with Http-Status 200
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| A | Good: one preferred version: non-www is preferred
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| A | Good: No cookie sent via http.
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| A | Good: every https has a Strict Transport Security Header
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| A | Good: HSTS max-age is long enough, 31536000 seconds = 365 days
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| Warning: HSTS preload sent, but not in Preload-List. Never send a preload directive if you don't know what preload means. Check https://hstspreload.org/ to learn the basics about the Google-Preload list. If you send a preload directive, you should **immediately** add your domain to the HSTS preload list via https://hstspreload.org/ . If Google accepts the domain, so the status is "pending": Note that new entries are hardcoded into the Chrome source code and can take several months before they reach the stable version. So you will see this message some months. If you don't want that or if you don't understand "preload", but if you send a preload directive and if you have correct A-redirects, everybody can add your domain to that list. Then you may have problems, it's not easy to undo that. So if you don't want your domain preloaded, remove the preload directive.
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| HSTS-Preload-Status: unknown. Domain never included in the Preload-list. Check https://hstspreload.org/ to learn some basics about the Google-Preload-List.
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| A | Good: All urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset)
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| http://changelog.so/ 76.76.21.21
| 0;url=https://changelog.so/
| Info: Non-standard Header "Refresh" found.
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| http://www.changelog.so/ 76.76.21.21
| 0;url=https://www.changelog.so/
| Info: Non-standard Header "Refresh" found.
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| https://www.changelog.so/ 76.76.21.21
| 0;url=https://changelog.so/
| Info: Non-standard Header "Refresh" found.
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| https://76.76.21.21/ 76.76.21.21
| 0;url=https://vercel.com/
| Info: Non-standard Header "Refresh" found.
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| A | http://changelog.so/ 76.76.21.21
| https://changelog.so/
| Correct redirect http - https with the same domain name
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| A | http://www.changelog.so/ 76.76.21.21
| https://www.changelog.so/
| Correct redirect http - https with the same domain name
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| N | https://76.76.21.21/ 76.76.21.21
| https://vercel.com/
| Error - Certificate isn't trusted, RemoteCertificateNameMismatch, RemoteCertificateChainErrors
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| 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 different. So that domain requires Server Name Indication (SNI), so the server is able to select the correct certificate.: Domain changelog.so, 1 ip addresses.
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| 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 different. So that domain requires Server Name Indication (SNI), so the server is able to select the correct certificate.: Domain www.changelog.so, 1 ip addresses.
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| 2. Header-Checks |
| 3. DNS- and NameServer - Checks |
| A | Info:: 5 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 3 Name Servers.
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| A | Info:: 5 Queries complete, 5 with IPv6, 0 with IPv4.
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| A | Good: All DNS Queries done via IPv6.
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| 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.ns1.vercel-dns.com (2600:180a:1001::1, 96.45.80.1), ns11.constellix.com (2600:180a:1001::1, 96.45.80.1), ns2.vercel-dns.com (2600:180b:2001::1, 46.31.236.1)
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| A | Good (1 - 3.0):: An average of 1.7 queries per domain name server required to find all ip addresses of all name servers.
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| A | Info:: 3 different Name Servers found: ns1.vercel-dns.com, ns11.constellix.com, ns2.vercel-dns.com, 2 Name Servers included in Delegation: ns1.vercel-dns.com, ns2.vercel-dns.com, 2 Name Servers included in 1 Zone definitions: ns1.vercel-dns.com, ns2.vercel-dns.com, 1 Name Servers listed in SOA.Primary: ns11.constellix.com.
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| A | Good: Only one SOA.Primary Name Server found.: ns11.constellix.com.
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| Error: SOA.Primary Name Server not included in the delegation set.: ns11.constellix.com.
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| 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.vercel-dns.com, ns2.vercel-dns.com
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| A | Good: All Name Server Domain Names have a Public Suffix.
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| A | Good: All Name Server Domain Names ending with a Public Suffix have minimal one IPv4- or IPv6 address.
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| A | Good: All Name Server ip addresses are public.
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| A | Good: Minimal 2 different name servers (public suffix and public ip address) found: 3 different Name Servers found
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| A | Good: All name servers have ipv4- and ipv6-addresses.: 3 different Name Servers found
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| 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.: 3 Name Servers, 1 Top Level Domain: com
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| A | Good: Name Servers with different domain names found.: 2 different Domains found
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| Warning: All Name Servers from the same Country / IP location.: 3 Name Servers, 1 Countries: US
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| A | Info: Ipv4-Subnet-list: 3 Name Servers, 2 different subnets (first Byte): 46., 96., 2 different subnets (first two Bytes): 46.31., 96.45., 2 different subnets (first three Bytes): 46.31.236., 96.45.80.
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| A | Good: Name Server IPv4-addresses from different subnet found:
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| A | Info: IPv6-Subnet-list: 3 Name Servers with IPv6, 1 different subnets (first block): 2600:, 2 different subnets (first two blocks): 2600:180a:, 2600:180b:, 2 different subnets (first three blocks): 2600:180a:1001:, 2600:180b:2001:, 2 different subnets (first four blocks): 2600:180a:1001:0000:, 2600:180b:2001:0000:
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| A | Good: Name Server IPv6 addresses from different subnets found.
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| A | Good: Nameserver supports TCP connections: 6 good Nameserver
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| A | Info: Nameserver mit different domain names found. May be a problem with DNS-Updates
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| A | Good: Nameserver supports Echo Capitalization: 6 good Nameserver
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| A | Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 6 good Nameserver
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| A | Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 6 good Nameserver
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| Nameserver doesn't pass all EDNS-Checks: ns11.constellix.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.
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| A | Good: All SOA have the same Serial Number
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| A | Good: CAA entries found, creating certificate is limited: letsencrypt.org is allowed to create certificates
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| 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.
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| A | Good: Every https result with status 200 and greater 1024 Bytes is compressed (gzip, deflate, br checked).
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| https://changelog.so/ 76.76.21.21
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| 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.
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| https://vercel.com/
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| 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.
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| A | Good: Every https connection via port 443 supports the http/2 protocol via ALPN.
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| A | Info: No img element found, no alt attribute checked
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| 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
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| A | Duration: 103124 milliseconds, 103.124 seconds
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