| 1. General Results, most used to calculate the result |
| A | name "tws.ssup.cz" is subdomain, public suffix is ".cz", top-level-domain is ".cz", top-level-domain-type is "country-code", Country is Czechia, tld-manager is "CZ.NIC, z.s.p.o", num .cz-domains preloaded: 1925 (complete: 245733)
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| Warning: Only one ip address found: tws.ssup.cz has only one ip address.
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| Warning: Only one ip address found: www.tws.ssup.cz 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: tws.ssup.cz 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.tws.ssup.cz has no ipv6 address.
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| A | Good: No asked Authoritative Name Server had a timeout
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| A | Good: destination is https
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| A | Good: No cookie sent via http.
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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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| A | http://tws.ssup.cz/ 46.229.122.100
| https://tws.ssup.cz/
| Correct redirect http - https with the same domain name
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| B | https://tws.ssup.cz/ 46.229.122.100
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| Missing HSTS-Header
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| B | https://www.tws.ssup.cz/ 46.229.122.100
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| Missing HSTS-Header
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| C | Error - no preferred version www or non-www. Select one version as preferred version, then add a redirect https + not-preferred version to https + preferred version. Perhaps in your port 443 vHost something like "RewriteEngine on" + "RewriteCond %{SERVER_NAME} = example.com" + "ReWriteRule ^ https://www.example.com%{REQUEST_URI} [END,QSA,R=permanent]" (three rows, without the "). That should create a redirect https + example.com ⇒ https + www.example.com. Or switch both values to use the non-www version as your preferred version.
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| C | Error - more then one version with Http-Status 200. After all redirects, all users (and search engines) should see the same https url: Non-www or www, but not both with http status 200.
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| E | http://www.tws.ssup.cz/ 46.229.122.100
| https://tws.ssup.cz/
| Wrong redirect one domain http to other domain https. First redirect to https without new dns query, 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.
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| N | https://tws.ssup.cz/ 46.229.122.100
|
| Error - Certificate isn't trusted, RemoteCertificateChainErrors
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| N | https://www.tws.ssup.cz/ 46.229.122.100
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| Error - Certificate isn't trusted, RemoteCertificateNameMismatch, RemoteCertificateChainErrors
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| N | https://46.229.122.100/ 46.229.122.100
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| Error - Certificate isn't trusted, RemoteCertificateNameMismatch, RemoteCertificateChainErrors
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| R | http://tws.ssup.cz/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 46.229.122.100
| https://tws.ssup.cz.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
| Redirect to not existing domain
|
| R | http://www.tws.ssup.cz/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 46.229.122.100
| https://tws.ssup.cz.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
| Redirect to not existing domain
|
| Y | tws.ssup.cz
| fe80::210:5aff:febe:302d
| Warning: Private ip address found. No connection possible. There are two types of ip addresses: Worldwide unique, global addresses and private addresses. If you want that other users connect your domain, your domain must have minimal one A- (ipv4) or AAAA- (ipv6) entry with a global ip address. Check https://en.wikipedia.org/wiki/Private_network to understand the details: fe80:0000:0000:0000:0000:0000:0000:0000 to fe80:ffff:ffff:ffff:ffff:ffff:ffff:ffff: Link-local address
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| Y | www.tws.ssup.cz
| fe80::210:5aff:febe:302d
| Warning: Private ip address found. No connection possible. There are two types of ip addresses: Worldwide unique, global addresses and private addresses. If you want that other users connect your domain, your domain must have minimal one A- (ipv4) or AAAA- (ipv6) entry with a global ip address. Check https://en.wikipedia.org/wiki/Private_network to understand the details: fe80:0000:0000:0000:0000:0000:0000:0000 to fe80:ffff:ffff:ffff:ffff:ffff:ffff:ffff: Link-local address
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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 the same. So that domain doesn't require Server Name Indication (SNI), it's the primary certificate of that set of ip addresses.: Domain tws.ssup.cz, 1 ip addresses, 1 different http results.
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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 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.tws.ssup.cz, 1 ip addresses, 1 different http results.
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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.tws.ssup.cz
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| 2. Header-Checks |
| F | tws.ssup.cz 46.229.122.100
| Content-Security-Policy
| Critical: Missing Header:
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| F | tws.ssup.cz 46.229.122.100
| X-Content-Type-Options
| Critical: Missing Header:
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| F | tws.ssup.cz 46.229.122.100
| Referrer-Policy
| Critical: Missing Header:
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| F | tws.ssup.cz 46.229.122.100
| Permissions-Policy
| Critical: Missing Header:
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| B | tws.ssup.cz 46.229.122.100
| Cross-Origin-Embedder-Policy
| Info: Missing Header
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| B | tws.ssup.cz 46.229.122.100
| Cross-Origin-Opener-Policy
| Info: Missing Header
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| B | tws.ssup.cz 46.229.122.100
| Cross-Origin-Resource-Policy
| Info: Missing Header
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| F | www.tws.ssup.cz 46.229.122.100
| Content-Security-Policy
| Critical: Missing Header:
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| F | www.tws.ssup.cz 46.229.122.100
| X-Content-Type-Options
| Critical: Missing Header:
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| F | www.tws.ssup.cz 46.229.122.100
| Referrer-Policy
| Critical: Missing Header:
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| F | www.tws.ssup.cz 46.229.122.100
| Permissions-Policy
| Critical: Missing Header:
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| B | www.tws.ssup.cz 46.229.122.100
| Cross-Origin-Embedder-Policy
| Info: Missing Header
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| B | www.tws.ssup.cz 46.229.122.100
| Cross-Origin-Opener-Policy
| Info: Missing Header
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| B | www.tws.ssup.cz 46.229.122.100
| Cross-Origin-Resource-Policy
| Info: Missing Header
|
| 3. DNS- and NameServer - Checks |
| A | Info:: 4 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 3 Name Servers.
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| A | Info:: 4 Queries complete, 4 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.alfa.ns.active24.cz (2a02:4a8:ac24:100::96:2, 81.95.96.2), gama.ns.active24.sk (185.71.158.30, 2a00:1968:0:1002:185:71:158:30), beta.ns.active24.cz (185.111.90.94, 2a00:4b40:1000:590:185:111:90:94)
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| A | Good (1 - 3.0):: An average of 1.3 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: alfa.ns.active24.cz, beta.ns.active24.cz, gama.ns.active24.sk, 3 Name Servers included in Delegation: alfa.ns.active24.cz, beta.ns.active24.cz, gama.ns.active24.sk, 3 Name Servers included in 1 Zone definitions: alfa.ns.active24.cz, beta.ns.active24.cz, gama.ns.active24.sk, 1 Name Servers listed in SOA.Primary: alfa.ns.active24.cz.
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| A | Good: Only one SOA.Primary Name Server found.: alfa.ns.active24.cz.
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| A | Good: SOA.Primary Name Server included in the delegation set.: alfa.ns.active24.cz.
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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: alfa.ns.active24.cz, beta.ns.active24.cz, gama.ns.active24.sk
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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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| A | Good: Name servers with different Top Level Domains / Public Suffix List entries found: 3 Name Servers, 2 Top Level Domains: sk, cz
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| A | Good: Name Servers with different domain names found.: 2 different Domains found
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| A | Good: Name servers with different Country locations found: 3 Name Servers, 3 Countries: CZ, SE, SK
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| A | Info: Ipv4-Subnet-list: 3 Name Servers, 2 different subnets (first Byte): 185., 81., 3 different subnets (first two Bytes): 185.111., 185.71., 81.95., 3 different subnets (first three Bytes): 185.111.90., 185.71.158., 81.95.96.
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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, 2 different subnets (first block): 2a00:, 2a02:, 3 different subnets (first two blocks): 2a00:1968:, 2a00:4b40:, 2a02:04a8:, 3 different subnets (first three blocks): 2a00:1968:0000:, 2a00:4b40:1000:, 2a02:04a8:ac24:, 3 different subnets (first four blocks): 2a00:1968:0000:1002:, 2a00:4b40:1000:0590:, 2a02:04a8:ac24:0100:
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| A | Good: Name Server IPv6 addresses from different subnets found.
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| A | Good: Nameserver supports TCP connections: 2 good Nameserver
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| A | Good: Nameserver supports Echo Capitalization: 2 good Nameserver
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| X | Nameserver Timeout checking Echo Capitalization: b.ns.nic.cz
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| X | Nameserver Timeout checking Echo Capitalization: d.ns.nic.cz
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| A | Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 2 good Nameserver
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| X | Nameserver Timeout checking EDNS512: b.ns.nic.cz
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| A | Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 2 good Nameserver
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| Nameserver doesn't pass all EDNS-Checks: b.ns.nic.cz: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: fatal timeout. DNSSEC: ok. V1DNSSEC: ok. NSID: ok (dns-sgix-01.nic.cz). COOKIE: ok. CLIENTSUBNET: ok.
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| Nameserver doesn't pass all EDNS-Checks: d.ns.nic.cz: OP100: fatal timeout. FLAGS: fatal timeout. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok (dns-sgix-02.nic.cz). COOKIE: ok. 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 |
| https://tws.ssup.cz.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
|
| Fatal: Check of /.well-known/acme-challenge/random-filename redirects to not-existing domain. Creating a Letsencrypt certificate via http-01 challenge can't work. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask.
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| https://tws.ssup.cz/ 46.229.122.100
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| Warning: https result with status 200 and size greater then 1024 Bytes without Compression found. Add Compression support (gzip, deflate, br - these are checked) so the html content is compressed.
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| https://www.tws.ssup.cz/ 46.229.122.100
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| Warning: https result with status 200 and size greater then 1024 Bytes without Compression found. Add Compression support (gzip, deflate, br - these are checked) so the html content is compressed.
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| https://46.229.122.100/ 46.229.122.100
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| Warning: https result with status 200 and size greater then 1024 Bytes without Compression found. Add Compression support (gzip, deflate, br - these are checked) so the html content is compressed.
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| https://tws.ssup.cz/ 46.229.122.100
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| 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.
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| https://www.tws.ssup.cz/ 46.229.122.100
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| 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.
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| https://46.229.122.100/ 46.229.122.100
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| 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.
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| https://tws.ssup.cz/ 46.229.122.100
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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://www.tws.ssup.cz/ 46.229.122.100
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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://46.229.122.100/ 46.229.122.100
|
| 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://tws.ssup.cz/ 46.229.122.100
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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://www.tws.ssup.cz/ 46.229.122.100
|
| 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://46.229.122.100/ 46.229.122.100
|
| 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://tws.ssup.cz/ 46.229.122.100
|
| 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.: 2 script elements without defer/async.
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| https://www.tws.ssup.cz/ 46.229.122.100
|
| 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.: 2 script elements without defer/async.
|
| https://46.229.122.100/ 46.229.122.100
|
| 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.: 2 script elements without defer/async.
|
| Warning: CSS / JavaScript found without Compression. Compress these ressources, gzip, deflate, br are checked. 4 external CSS / JavaScript files without GZip found - 2 with GZip, 6 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. 9 external CSS / JavaScript 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, 9 complete.
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| A | Good: All checked attribute values are enclosed in quotation marks (" or ').
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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: 318744 milliseconds, 318.744 seconds
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