| 1. General Results, most used to calculate the result |
| A | name "krtek.vfu.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: 1593 (complete: 220007)
|
| A | Good: All ip addresses are public addresses
|
| Warning: Only one ip address found: krtek.vfu.cz 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: krtek.vfu.cz has no ipv6 address.
|
| A | DNS: "Name Error" means: No www-dns-entry defined. This isn't a problem
|
| A | https://krtek.vfu.cz/ 195.113.198.70
| https://krtek.vfu.cz/guacamole/
| Correct redirect https to https
|
| A | https://195.113.198.70/ 195.113.198.70
| https://krtek.vfu.cz/guacamole/
| 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 https has a Strict Transport Security Header
|
| A | Good: HSTS max-age is long enough, 63072000 seconds = 730 days
|
| A | Good: HSTS has includeSubdomains - directive
|
| A | Good: HSTS has preload directive
|
| 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):1 complete Content-Type - header (2 urls)
|
| https://krtek.vfu.cz/guacamole/
|
| Url with incomplete Content-Type - header - missing charset
|
| A | http://krtek.vfu.cz/ 195.113.198.70
| https://krtek.vfu.cz/
| Correct redirect http - https with the same domain name
|
| N | https://195.113.198.70/ 195.113.198.70
| https://krtek.vfu.cz/guacamole/
| Error - Certificate isn't trusted, RemoteCertificateNameMismatch
|
| 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 krtek.vfu.cz, 1 ip addresses, 1 different http results.
|
| 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.krtek.vfu.cz
|
| 2. Header-Checks |
| A | krtek.vfu.cz
| Content-Security-Policy
| Ok: Header without syntax errors found: default-src 'self' 'unsafe-inline'
|
| F |
|
| Bad: default-src with 'unsafe-inline' or 'unsave-eval'. That's dangerous, don't use it.
|
| E |
|
| Bad: No form-action directive found. Use one to limit the form - action - destinations. form-action is a navigation-directive, so default-src isn't used.
|
| E |
|
| Bad: No frame-ancestors directive found. Use one to limit the pages allowed to use this page in frame / iframe / object / embed / applet. frame-ancestors is a navigation-directive, so default-src isn't used.
|
| E |
|
| Bad: No base-uri directive found. Use one to limit 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.
|
| E |
|
| Critical: No object-src defined, the default-src used as fallback allows too much. object / embed / applet shouldn't be able to load these resources.
|
| E |
|
| Critical: No script-src defined, the default-src used as fallback allows too much. script-src should always restricted.
|
| 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: strict-origin-when-cross-origin
|
| A |
| Permissions-Policy
| Ok: Header without syntax errors found: accelerometer=(), camera=(), geolocation=(), gyroscope=(), magnetometer=(), microphone=(), payment=(), usb=(), fullscreen=(), sync-xhr=(), autoplay=(), encrypted-media=()
|
| A |
| X-Frame-Options
| Ok: Header without syntax errors found: SAMEORIGIN
|
| B |
|
| Info: Header is deprecated. May not longer work in modern browsers. SAMEORIGIN. 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.
|
| 3. DNS- and NameServer - Checks |
| A | Info:: 18 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 2 Name Servers.
|
| A | Info:: 18 Queries complete, 14 with IPv6, 4 with IPv4.
|
| Warning: Only some DNS Queries done via ipv6. IPv6 is the future, so the name servers of your name servers should have ipv6 addresses.
|
| 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.ns.muni.cz (147.251.4.33, 2001:718:801:404::33), ns1.vetuni.cz (195.113.198.35), ns.muni.cz (147.251.4.33, 2001:718:801:404::33)
|
| Bad (greater 8):: An average of 9.0 queries per domain name server required to find all ip addresses of all name servers.
|
| A | Info:: 2 different Name Servers found: ns.muni.cz, ns1.vetuni.cz, 2 Name Servers included in Delegation: ns.muni.cz, ns1.vetuni.cz, 2 Name Servers included in 1 Zone definitions: ns.muni.cz, ns1.vetuni.cz, 1 Name Servers listed in SOA.Primary: ns1.vetuni.cz.
|
| A | Good: Only one SOA.Primary Name Server found.: ns1.vetuni.cz.
|
| A | Good: SOA.Primary Name Server included in the delegation set.: ns1.vetuni.cz.
|
| 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: ns.muni.cz, ns1.vetuni.cz
|
| 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: 2 different Name Servers found
|
| A | Good: Some Name Servers have IPv6 addresses: 1 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.: 2 Name Servers, 1 Top Level Domain: cz
|
| A | Good: Name Servers with different domain names found.: 2 different Domains found
|
| Warning: All Name Servers from the same Country / IP location.: 2 Name Servers, 1 Countries: CZ
|
| A | Info: Ipv4-Subnet-list: 2 Name Servers, 2 different subnets (first Byte): 147., 195., 2 different subnets (first two Bytes): 147.251., 195.113., 2 different subnets (first three Bytes): 147.251.4., 195.113.198.
|
| A | Excellent: Every Name Server IPv4-address starts with an unique Byte.
|
| A | Info: IPv6-Subnet-list: 1 Name Servers with IPv6, 1 different subnets (first block): 2001:, 1 different subnets (first two blocks): 2001:0718:, 1 different subnets (first three blocks): 2001:0718:0801:, 1 different subnets (first four blocks): 2001:0718:0801:0404:
|
| Fatal: All Name Server IPv6 addresses from the same subnet.
|
| A | Good: Nameserver supports TCP connections: 1 good Nameserver
|
| A | Good: Nameserver supports Echo Capitalization: 1 good Nameserver
|
| A | Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 1 good Nameserver
|
| A | Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 1 good Nameserver
|
| Nameserver doesn't pass all EDNS-Checks: ns.muni.cz / 147.251.4.33: OP100: ok. FLAGS: ok. V1: ok. V1OP100: ok. V1FLAGS: ok. DNSSEC: ok. V1DNSSEC: ok. NSID: ok. COOKIE: fatal timeout. CLIENTSUBNET: ok.
|
| Nameserver doesn't pass all EDNS-Checks: ns1.vetuni.cz: 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.
|
| 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.
|
| https://krtek.vfu.cz/guacamole/
|
| 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.
|
| https://krtek.vfu.cz/guacamole/
|
| 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.
|
| A | Good: Every https result with status 200 has a minified Html-Content with a quota lower then 110 %.
|
| https://krtek.vfu.cz/guacamole/
|
| 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://krtek.vfu.cz/guacamole/
|
| 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.: 10 script elements without defer/async.
|
| Warning: CSS / JavaScript found without Compression. Compress these ressources, gzip, deflate, br are checked. 12 external CSS / JavaScript files without GZip found - 0 with GZip, 12 complete
|
| Warning: CSS / JavaScript files with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 10 external CSS / JavaScript files without Cache-Control-Header, 2 with Cache-Control, but no max-age, 0 with Cache-Control max-age too short (minimum 7 days), 0 with Cache-Control long enough, 12 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://krtek.vfu.cz/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
| 8.797 seconds
| Warning: 404 needs more then one second
|
| A | Duration: 146920 milliseconds, 146.920 seconds
|
%22%20style=%22background-color:rgb(255,255,255)%22%3e%3c/svg%3e)