| 1. General Results, most used to calculate the result |
| A | name "ubuntu.man.lodz.pl" is subdomain, public suffix is ".lodz.pl", top-level-domain is ".pl", top-level-domain-type is "country-code", Country is Poland, tld-manager is "Research and Academic Computer Network", num .pl-domains preloaded: 2145 (complete: 276475)
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| A | Good: All ip addresses are public addresses
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| Warning: Only one ip address found: ubuntu.man.lodz.pl 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: ubuntu.man.lodz.pl has no ipv6 address.
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| A | Good: No asked Authoritative Name Server had a timeout
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| A | DNS: "Name Error" means: No www-dns-entry defined. This isn't a problem
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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, 63072000 seconds = 730 days
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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: Some urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset):3 complete Content-Type - header (4 urls)
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| https://212.191.2.18/ 212.191.2.18
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| Url with incomplete Content-Type - header - missing charset
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| 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.
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| N | https://212.191.2.18/ 212.191.2.18
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| Error - Certificate isn't trusted, RemoteCertificateNameMismatch
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| X | Fatal error: Nameserver doesn't support TCP connection: dns2.man.lodz.pl / 212.51.192.5: Fatal error (-14). Details: Unable to read data from the transport connection: Ein Verbindungsversuch ist fehlgeschlagen, da die Gegenstelle nach einer bestimmten Zeitspanne nicht richtig reagiert hat, oder die hergestellte Verbindung war fehlerhaft, da der verbundene Host nicht reagiert hat.. - Ein Verbindungsversuch ist fehlgeschlagen, da die Gegenstelle nach einer bestimmten Zeitspanne nicht richtig reagiert hat, oder die hergestellte Verbindung war fehlerhaft, da der verbundene Host nicht reagiert hat
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| X | Fatal error: Nameserver doesn't support TCP connection: j-dns.pl: Fatal error (-14). Details: Unable to read data from the transport connection: Eine vorhandene Verbindung wurde vom Remotehost geschlossen.. - Eine vorhandene Verbindung wurde vom Remotehost geschlossen.
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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 ubuntu.man.lodz.pl, 1 ip addresses.
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| 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.ubuntu.man.lodz.pl
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| 2. Header-Checks |
| F | ubuntu.man.lodz.pl 212.191.2.18
| Content-Security-Policy
| Critical: Missing Header:
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| F | ubuntu.man.lodz.pl 212.191.2.18
| X-Content-Type-Options
| Critical: Missing Header:
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| F | ubuntu.man.lodz.pl 212.191.2.18
| Referrer-Policy
| Critical: Missing Header:
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| F | ubuntu.man.lodz.pl 212.191.2.18
| Permissions-Policy
| Critical: Missing Header:
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| B | ubuntu.man.lodz.pl 212.191.2.18
| Cross-Origin-Embedder-Policy
| Info: Missing Header
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| B | ubuntu.man.lodz.pl 212.191.2.18
| Cross-Origin-Opener-Policy
| Info: Missing Header
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| B | ubuntu.man.lodz.pl 212.191.2.18
| Cross-Origin-Resource-Policy
| Info: Missing Header
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| 3. DNS- and NameServer - Checks |
| A | Info:: 17 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 4 Name Servers.
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| A | Info:: 17 Queries complete, 9 with IPv6, 8 with IPv4.
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| Warning: Only some DNS Queries done via ipv6. IPv6 is the future, so the name servers of your name servers should have ipv6 addresses.
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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.dns.man.lodz.pl (212.51.192.2), dns.man.lodz.pl (212.51.192.2), dns2.man.lodz.pl (212.51.192.5), ns1.task.gda.pl (153.19.250.101)
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| Ok (4 - 8):: An average of 4.3 queries per domain name server required to find all ip addresses of all name servers.
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| A | Info:: 5 different Name Servers found: dns.man.lodz.pl, dns1.p.lodz.pl, dns2.man.lodz.pl, ns1.task.gda.pl, ns1.tpnet.pl, 5 Name Servers included in Delegation: dns.man.lodz.pl, dns1.p.lodz.pl, dns2.man.lodz.pl, ns1.task.gda.pl, ns1.tpnet.pl, 5 Name Servers included in 1 Zone definitions: dns.man.lodz.pl, dns1.p.lodz.pl, dns2.man.lodz.pl, ns1.task.gda.pl, ns1.tpnet.pl, 1 Name Servers listed in SOA.Primary: dns2.man.lodz.pl.
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| A | Good: Only one SOA.Primary Name Server found.: dns2.man.lodz.pl.
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| A | Good: SOA.Primary Name Server included in the delegation set.: dns2.man.lodz.pl.
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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 | Info: Ipv4-Subnet-list: 5 Name Servers, 3 different subnets (first Byte): 153., 212., 80., 3 different subnets (first two Bytes): 153.19., 212.51., 80.50., 4 different subnets (first three Bytes): 153.19.250., 212.51.192., 212.51.207., 80.50.50.
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| A | Good: Name Server IPv4-addresses from different subnet found:
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| A | Info: IPv6-Subnet-list: 2 Name Servers with IPv6, 2 different subnets (first block): 2001:, 2a01:, 2 different subnets (first two blocks): 2001:4070:, 2a01:1700:, 2 different subnets (first three blocks): 2001:4070:0001:, 2a01:1700:0002:, 2 different subnets (first four blocks): 2001:4070:0001:0250:, 2a01:1700:0002:0001:
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| A | Excellent: Every Name Server IPv6-address starts with an unique Hex-block
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| A | Good: Nameserver supports Echo Capitalization: 14 good Nameserver
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| A | Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 14 good Nameserver
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| A | Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 14 good Nameserver
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| Nameserver doesn't pass all EDNS-Checks: d-dns.pl: 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 (LHR3). COOKIE: fatal timeout. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: dns2.man.lodz.pl: 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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| Nameserver doesn't pass all EDNS-Checks: h-dns.pl: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok (FRA2). COOKIE: SOA expected, but NOT found, NOERR expectend and NOERR found, Version 0 expectend and found. CLIENTSUBNET: ok.
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| A | Good: All SOA have the same Serial Number
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| 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.
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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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| A | Good: No https + http status 200 with inline CSS / JavaScript found
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| https://212.191.2.18/ 212.191.2.18
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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://ubuntu.man.lodz.pl/ 212.191.2.18
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| 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.
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| https://212.191.2.18/ 212.191.2.18
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| 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.
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| A | Good: All images with internal compression not compressed. Some Images (.png, .jpg, .jpeg, .webp, .gif) are already compressed, so an additional compression isn't helpful. 4 images (type image/png, image/jpg, image/jpeg, image/webp, image/gif) found without additional Compression. Not required because these images are already compressed
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| Warning: Images with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 4 image files without Cache-Control-Header, 0 with Cache-Control, but no max-age, 0 with Cache-Control max-age too short (minimum 7 days), 0 with Cache-Control long enough, 4 complete.
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| A | Good: All checked attribute values are enclosed in quotation marks (" or ').
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| A | Good: All img-elements have a valid alt-attribute.: 4 img-elements found.
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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: 189826 milliseconds, 189.826 seconds
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