| 1. General Results, most used to calculate the result |
| A | name "alfa-system.pl" is domain, public suffix is ".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: 1990 (complete: 263653)
|
| A | Good: All ip addresses are public addresses
|
| Warning: Only one ip address found: alfa-system.pl has only one ip address.
|
| Warning: Only one ip address found: www.alfa-system.pl 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: alfa-system.pl has no ipv6 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: www.alfa-system.pl has no ipv6 address.
|
| A | Good: No asked Authoritative Name Server had a timeout
|
| A | https://alfa-system.pl/ 91.231.70.57
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 1 (SPKI, SubjectPublicKeyInfo), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: a8ed4b78bd0cbb1b86aadddac62d3968595745b11628cf5fdea869eb672391d0 confirms the Certificate with the same value
|
| A | https://alfa-system.pl/ 91.231.70.57
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 2 (SHA2-512, 512 bit hash by SHA2), CertificateAssociationData: 074721697a327bc4f4f7241bfe3117a02f2963a2dd4516517d9f9a9e0dd9898d16f6bb9ad39feb962e43c60a5beb4695feed9d4bef4725c9b6f192171a3a9bf1 confirms the Certificate with the same value
|
| A | https://alfa-system.pl/ 91.231.70.57
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: 680fc45062e65328097018e68ad458006fa47f54b61b2377aeb51fed41535d37 confirms the Certificate with the same value
|
| A | https://alfa-system.pl/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 2 (SHA2-512, 512 bit hash by SHA2), CertificateAssociationData: 074721697a327bc4f4f7241bfe3117a02f2963a2dd4516517d9f9a9e0dd9898d16f6bb9ad39feb962e43c60a5beb4695feed9d4bef4725c9b6f192171a3a9bf1 confirms the Certificate with the same value
|
| A | https://alfa-system.pl/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 1 (SPKI, SubjectPublicKeyInfo), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: a8ed4b78bd0cbb1b86aadddac62d3968595745b11628cf5fdea869eb672391d0 confirms the Certificate with the same value
|
| A | https://alfa-system.pl/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: 680fc45062e65328097018e68ad458006fa47f54b61b2377aeb51fed41535d37 confirms the Certificate with the same value
|
| A | https://91.231.70.57/ 91.231.70.57
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 2 (SHA2-512, 512 bit hash by SHA2), CertificateAssociationData: 074721697a327bc4f4f7241bfe3117a02f2963a2dd4516517d9f9a9e0dd9898d16f6bb9ad39feb962e43c60a5beb4695feed9d4bef4725c9b6f192171a3a9bf1 confirms the Certificate with the same value
|
| A | https://91.231.70.57/ 91.231.70.57
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: 680fc45062e65328097018e68ad458006fa47f54b61b2377aeb51fed41535d37 confirms the Certificate with the same value
|
| A | https://91.231.70.57/ 91.231.70.57
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 1 (SPKI, SubjectPublicKeyInfo), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: a8ed4b78bd0cbb1b86aadddac62d3968595745b11628cf5fdea869eb672391d0 confirms the Certificate with the same value
|
| A | https://mta-sts.alfa-system.pl/.well-known/mta-sts.txt 91.231.70.43
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 2 (SHA2-512, 512 bit hash by SHA2), CertificateAssociationData: 074721697a327bc4f4f7241bfe3117a02f2963a2dd4516517d9f9a9e0dd9898d16f6bb9ad39feb962e43c60a5beb4695feed9d4bef4725c9b6f192171a3a9bf1 confirms the Certificate with the same value
|
| A | https://mta-sts.alfa-system.pl/.well-known/mta-sts.txt 91.231.70.43
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 1 (SPKI, SubjectPublicKeyInfo), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: a8ed4b78bd0cbb1b86aadddac62d3968595745b11628cf5fdea869eb672391d0 confirms the Certificate with the same value
|
| A | https://mta-sts.alfa-system.pl/.well-known/mta-sts.txt 91.231.70.43
|
| Good: Valid DANE - entry found: signed Data _443._tcp.alfa-system.pl: CertUsage 3 (DANE-EE, Domain-issued certificate), Selector 0 (Cert, Full certificate), Matching 1 (SHA2-256, 256 bit hash by SHA2), CertificateAssociationData: 680fc45062e65328097018e68ad458006fa47f54b61b2377aeb51fed41535d37 confirms the Certificate with the same value
|
| 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.
|
| 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.
|
| 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):3 complete Content-Type - header (4 urls)
|
| https://mta-sts.alfa-system.pl/.well-known/mta-sts.txt 91.231.70.43
|
| Url with incomplete Content-Type - header - missing charset
|
| A | http://alfa-system.pl/ 91.231.70.57
| https://alfa-system.pl/
| Correct redirect http - https with the same domain name
|
| A | http://www.alfa-system.pl/ 91.231.70.57
| https://www.alfa-system.pl/
| Correct redirect http - https with the same domain name
|
| B | https://www.alfa-system.pl/ 91.231.70.57
|
| Missing HSTS-Header
|
| B | https://www.alfa-system.pl/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
|
| Missing HSTS-Header
|
| I | https://alfa-system.pl/ 91.231.70.57
|
| Content problems or problems with resources included - http links, files doesn't exist, different Content-Type definitions. Check the Html-Content - Part.
|
| M | https://91.231.70.57/ 91.231.70.57
|
| Misconfiguration - main pages should never send http status 400 - 499
|
| N | https://91.231.70.57/ 91.231.70.57
|
| Error - Certificate isn't trusted, RemoteCertificateNameMismatch
|
| X | Fatal error: Nameserver doesn't support TCP connection: dns.alfa-system.pl / 2001:470:71:391::2: Timeout
|
| X | Fatal error: Nameserver doesn't support TCP connection: dns2.alfa-system.pl / 2001:470:71:69e::2: Timeout
|
| 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 alfa-system.pl, 1 ip addresses, 1 different http results.
|
| 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 www.alfa-system.pl, 1 ip addresses, 1 different http results.
|
| A | Good: _mta-sts TXT record found (mta-sts: Mail Transfer Agent Strict Transport Security - see RFC 8461). Domainname: _mta-sts.alfa-system.pl
|
| A | Good: _mta-sts TXT record is valid.
|
| A | Good: Subdomain mta-sts found: Subdomain-name: mta-sts.alfa-system.pl, ip : 91.231.70.43
|
| A | Good: Certificate of subdomain is valid. mta-sts.alfa-system.pl, ip : 91.231.70.43
|
| A | Good: /.well-known/mta-sts.txt with http status 200 found. Complete path: https://mta-sts.alfa-system.pl/.well-known/mta-sts.txt - ip : 91.231.70.43
|
| A | Good: mta-sts.txt has the required names "version", "mode", "max_age". mta-sts.alfa-system.pl, ip : 91.231.70.43
|
| A | Good: Minimal one mx definition found. mta-sts.alfa-system.pl, ip : 91.231.70.43
|
| A | Excellent: Complete and valid MTA-STS found!
|
| 2. Header-Checks |
| A | alfa-system.pl 91.231.70.57
| X-Content-Type-Options
| Ok: Header without syntax errors found: nosniff
|
| A |
| X-Frame-Options
| Ok: Header without syntax errors found: DENY
|
| B |
|
| Info: Header is deprecated. May not longer work in modern browsers. DENY. 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 |
| 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 | alfa-system.pl 91.231.70.57
| Content-Security-Policy
| Critical: Missing Header:
|
| F | alfa-system.pl 91.231.70.57
| Referrer-Policy
| Critical: Missing Header:
|
| F | alfa-system.pl 91.231.70.57
| Permissions-Policy
| Critical: Missing Header:
|
| B | alfa-system.pl 91.231.70.57
| Cross-Origin-Embedder-Policy
| Info: Missing Header
|
| B | alfa-system.pl 91.231.70.57
| Cross-Origin-Opener-Policy
| Info: Missing Header
|
| B | alfa-system.pl 91.231.70.57
| Cross-Origin-Resource-Policy
| Info: Missing Header
|
| 3. DNS- and NameServer - Checks |
| A | Info:: 3 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 5 Name Servers.
|
| A | Info:: 3 Queries complete, 3 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.dns.alfa-system.pl (2001:470:71:391::2, 91.231.70.37), fns2.42.pl (2001:41d0:701:1100::66c, 51.38.99.90), dns2.alfa-system.pl (2001:470:71:69e::2, 91.231.70.58), fns1.42.pl (79.98.145.34), ns2.3s.pl (85.14.85.2)
|
| A | Good (1 - 3.0):: An average of 0.6 queries per domain name server required to find all ip addresses of all name servers.
|
| A | Info:: 5 different Name Servers found: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl, ns2.3s.pl, 4 Name Servers included in Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, 4 Name Servers included in 1 Zone definitions: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl, 1 Name Servers listed in SOA.Primary: dns.alfa-system.pl.
|
| A | Good: Only one SOA.Primary Name Server found.: dns.alfa-system.pl.
|
| A | Good: SOA.Primary Name Server included in the delegation set.: dns.alfa-system.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns.alfa-system.pl (91.231.70.37): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns.alfa-system.pl (2001:470:71:391::2): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns2.alfa-system.pl (91.231.70.58): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: dns2.alfa-system.pl (2001:470:71:69e::2): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: fns1.42.pl (79.98.145.34): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: fns2.42.pl (51.38.99.90): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: fns2.42.pl (2001:41d0:701:1100::66c): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.3s.pl (85.14.85.2): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| X | Fatal: Inconsistency 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. Read https://www.iana.org/help/nameserver-requirements and send it to your Name Server Hoster.: ns2.3s.pl (2a00:13a0:3001::5353): Delegation: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, ns2.3s.pl, Zone: dns.alfa-system.pl, dns2.alfa-system.pl, fns1.42.pl, fns2.42.pl. Name Servers defined in Delegation, missing in Zone: ns2.3s.pl.Name Servers defined in Zone, missing in Delegation: fns2.42.pl.
|
| A | Good: All Name Server Domain Names have a Public Suffix.
|
| A | Good: All Name Server Domain Names ending with a Public Suffix have minimal one IPv4- or IPv6 address.
|
| A | Good: All Name Server ip addresses are public.
|
| A | Good: Minimal 2 different name servers (public suffix and public ip address) found: 5 different Name Servers found
|
| A | Good: Some Name Servers have IPv6 addresses: 4 Name Servers with IPv6 found (1 Name Servers without IPv6)
|
| 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.: 5 Name Servers, 1 Top Level Domain: pl
|
| A | Good: Name Servers with different domain names found.: 3 different Domains found
|
| A | Good: Name servers with different Country locations found: 5 Name Servers, 2 Countries: DE, PL
|
| A | Info: Ipv4-Subnet-list: 5 Name Servers, 4 different subnets (first Byte): 51., 79., 85., 91., 4 different subnets (first two Bytes): 51.38., 79.98., 85.14., 91.231., 4 different subnets (first three Bytes): 51.38.99., 79.98.145., 85.14.85., 91.231.70.
|
| A | Good: Name Server IPv4-addresses from different subnet found:
|
| A | Info: IPv6-Subnet-list: 4 Name Servers with IPv6, 2 different subnets (first block): 2001:, 2a00:, 3 different subnets (first two blocks): 2001:0470:, 2001:41d0:, 2a00:13a0:, 3 different subnets (first three blocks): 2001:0470:0071:, 2001:41d0:0701:, 2a00:13a0:3001:, 4 different subnets (first four blocks): 2001:0470:0071:0391:, 2001:0470:0071:069e:, 2001:41d0:0701:1100:, 2a00:13a0:3001:0000:
|
| A | Good: Name Server IPv6 addresses from different subnets found.
|
| A | Info: Nameserver mit different domain names found. May be a problem with DNS-Updates
|
| X | Nameserver Timeout checking Echo Capitalization: dns.alfa-system.pl / 2001:470:71:391::2
|
| X | Nameserver Timeout checking Echo Capitalization: dns2.alfa-system.pl / 2001:470:71:69e::2
|
| X | Nameserver Timeout checking EDNS512: dns.alfa-system.pl / 2001:470:71:391::2
|
| X | Nameserver Timeout checking EDNS512: dns2.alfa-system.pl / 2001:470:71:69e::2
|
| Nameserver doesn't pass all EDNS-Checks: dns.alfa-system.pl / 2001:470:71:391::2: 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: dns2.alfa-system.pl / 2001:470:71:69e::2: 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
|
| A | Good: CAA entries found, creating certificate is limited: certum.pl 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: Every https result with status 200 and greater 1024 Bytes is compressed (gzip, deflate, br checked).
|
| https://alfa-system.pl/ 91.231.70.57
|
| Warning: Https + http status 200 + Inline CSS / JavaScript found. Don't use inline CSS / JavaScript. These are compiled and re-used ressources, save these with a long Cache-Control max-age - header.
|
| https://alfa-system.pl/ 91.231.70.57
|
| 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://mta-sts.alfa-system.pl/.well-known/mta-sts.txt 91.231.70.43
|
| 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://alfa-system.pl/ 91.231.70.57
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| 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.
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| A | Good: All CSS / JavaScript files are sent compressed (gzip, deflate, br checked). That reduces the content of the files. 13 external CSS / JavaScript files found
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| Warning: Images with internal compression and Compression found. Images (.png, .jpg, .jpeg, .webp, .gif) are already compressed, so additional Compression isn't helpful. Don't send these images with gzip/deflate/br. 7 images (type image/png, image/jpg, image/jpeg, image/webp, image/gif) found with additional Compression. Compression is not required, these images are already compressed. 0 images (type image/png, image/jpg, image/jpeg, image/webp, image/gif) without Compression found. 7 images (type image/png, image/jpg, image/jpeg, image/webp, image/gif) complete.
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| 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, 12 with Cache-Control max-age too short (minimum 7 days), 1 with Cache-Control long enough, 13 complete.
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| Warning: Images with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 6 image files without Cache-Control-Header, 0 with Cache-Control, but no max-age, 1 with Cache-Control max-age too short (minimum 7 days), 0 with Cache-Control long enough, 7 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.: 7 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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| https://alfa-system.pl/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
| 2.470 seconds
| Warning: 404 needs more then one second
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| https://91.231.70.57/ 91.231.70.57
| 2.374 seconds
| Warning: 404 needs more then one second
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| A | Info: Different Server-Headers found
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| A | Duration: 323300 milliseconds, 323.300 seconds
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