1. General Results, most used to calculate the result A name "vbo2.mkb.ru" is subdomain, public suffix is ".ru", top-level-domain is ".ru", top-level-domain-type is "country-code", Country is Russian Federation (the), tld-manager is "Coordination Center for TLD RU", num .ru-domains preloaded: 2310 (complete: 210599) A Good: All ip addresses are public addresses Warning: Only one ip address found: vbo2.mkb.ru 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: vbo2.mkb.ru has no ipv6 address. A Good: No asked Authoritative Name Server had a timeout A DNS: "Name Error" means: No www-dns-entry defined. This isn't a problem 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. 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://vbo2.mkb.ru/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de Url with incomplete Content-Type - header - missing charset A http://vbo2.mkb.ru/ 195.191.77.240 https://vbo2.mkb.ru/ Correct redirect http - https with the same domain name B https://vbo2.mkb.ru/ 195.191.77.240 max-age=31536000; Critical: HSTS-Header has Parse-Errors. Empty entry, remove the semicolon at the end., Unknown directive found. Only max-age (with value), includeSubdomains or preload allowed. B https://vbo2.mkb.ru/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de max-age=31536000; Critical: HSTS-Header has Parse-Errors. Empty entry, remove the semicolon at the end., Unknown directive found. Only max-age (with value), includeSubdomains or preload allowed. B https://vbo2.mkb.ru/ 195.191.77.240 ASP.NET_SessionId=dt1zo51pjif0lsf2bsv0kukb; path=/; HttpOnly Cookie sent via https, but not marked as secure B https://vbo2.mkb.ru/ 195.191.77.240 dtCookie=v_4_srv_1_sn_43B9D79DE52762A09A54968EFD354C4C_perc_100000_ol_0_mul_1_app-3A6d41801dfa97b9bc_1; Path=/; Domain=.mkb.ru Cookie sent via https, but not marked as secure B https://vbo2.mkb.ru/ 195.191.77.240 dbo_uid=6dad41ba-515f-4696-a0bb-dfaf70445939; expires=Thu, 23-Nov-2023 21:00:00 GMT; path=/; secure; HttpOnly Cookie without a SameSite-Attribute. Possible values are: Strict/Lax/None. Cookie may not work as expected, if "None" is wanted, but browsers use "Lax" as default value. B https://vbo2.mkb.ru/ 195.191.77.240 ASP.NET_SessionId=dt1zo51pjif0lsf2bsv0kukb; path=/; HttpOnly Cookie without a SameSite-Attribute. Possible values are: Strict/Lax/None. Cookie may not work as expected, if "None" is wanted, but browsers use "Lax" as default value. B https://vbo2.mkb.ru/ 195.191.77.240 dtCookie=v_4_srv_1_sn_43B9D79DE52762A09A54968EFD354C4C_perc_100000_ol_0_mul_1_app-3A6d41801dfa97b9bc_1; Path=/; Domain=.mkb.ru Cookie without a SameSite-Attribute. Possible values are: Strict/Lax/None. Cookie may not work as expected, if "None" is wanted, but browsers use "Lax" as default value. N https://195.191.77.240/ 195.191.77.240 Error - Certificate isn't trusted, RemoteCertificateNameMismatch, RemoteCertificateChainErrors X Fatal error: Nameserver doesn't support TCP connection: ns1.as50464.net / 195.191.77.251: 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 different. So that domain requires Server Name Indication (SNI), so the server is able to select the correct certificate.: Domain vbo2.mkb.ru, 1 ip addresses. 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.vbo2.mkb.ru 2. Header-Checks A vbo2.mkb.ru 195.191.77.240 X-Content-Type-Options Ok: Header without syntax errors found: nosniff F vbo2.mkb.ru 195.191.77.240 Content-Security-Policy Critical: Missing Header: F vbo2.mkb.ru 195.191.77.240 Referrer-Policy Critical: Missing Header: F vbo2.mkb.ru 195.191.77.240 Permissions-Policy Critical: Missing Header: 3. DNS- and NameServer - Checks A Info:: 2 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 4 Name Servers. A Info:: 2 Queries complete, 2 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.ns2.as50464.net (195.191.77.252), ns3.as50464.net (178.248.233.248), ns4.as50464.net (178.248.237.45), ns5.as50464.net (178.248.238.223) A Good (1 - 3.0):: An average of 0.5 queries per domain name server required to find all ip addresses of all name servers. A Info:: 5 different Name Servers found: ns1.as50464.net, ns2.as50464.net, ns3.as50464.net, ns4.as50464.net, ns5.as50464.net, 4 Name Servers included in Delegation: ns2.as50464.net, ns3.as50464.net, ns4.as50464.net, ns5.as50464.net, 4 Name Servers included in 2 Zone definitions: ns2.as50464.net, ns3.as50464.net, ns4.as50464.net, ns5.as50464.net, 1 Name Servers listed in SOA.Primary: ns1.as50464.net. A Good: Only one SOA.Primary Name Server found.: ns1.as50464.net. Error: SOA.Primary Name Server not included in the delegation set.: ns1.as50464.net. A Good: All Name Server Domain Names have a Public Suffix. Error: Name Server Domain Names with Public Suffix and without ip address found.: 1 Name Servers without ipv4 and ipv6: 1 A Info: Ipv4-Subnet-list: 4 Name Servers, 2 different subnets (first Byte): 178., 195., 2 different subnets (first two Bytes): 178.248., 195.191., 4 different subnets (first three Bytes): 178.248.233., 178.248.237., 178.248.238., 195.191.77. A Good: Name Server IPv4-addresses from different subnet found: X Nameserver Timeout checking Echo Capitalization: ns1.as50464.net / 195.191.77.251 X Nameserver Timeout checking EDNS512: ns1.as50464.net / 195.191.77.251 Nameserver doesn't pass all EDNS-Checks: ns1.as50464.net: 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. Nameserver doesn't pass all EDNS-Checks: ns1.as50464.net: 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. Nameserver doesn't pass all EDNS-Checks: ns1.as50464.net / 195.191.77.251: 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: comodoca.com is allowed to create certificates A Good: CAA entries found, creating certificate is limited: digicert.com is allowed to create certificates A Good: CAA entries found, creating certificate is limited: globalsign.com is allowed to create certificates A Good: CAA entries found, creating certificate is limited: letsencrypt.org is allowed to create certificates A Good: CAA entries found, creating certificate is limited: sectigo.com is allowed to create certificates A Good: CAA entries found, creating certificate is limited: thawte.com is allowed to create certificates A Good: CAA entries found, creating certificate is limited: visa.com is allowed to create certificates A Good: CAA entries found, creating certificate is limited: globalsign.com is allowed to create wildcard-certificates Warning: Unknown CAA found: visa.com isn't defined. Unknown entry. May be wrong written, may be not longer valid. May be a missing entry in this tool. 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 supports GZip. https://vbo2.mkb.ru/ 195.191.77.240 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://vbo2.mkb.ru/ 195.191.77.240 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. A Good: Every https connection via port 443 supports the http/2 protocol via ALPN. A Good: Some script Elements (type text/javascript) with a src-Attribute have a defer / async - Attribute. So loading and executing these JavaScripts doesn't block parsing and rendering the Html-Output. https://vbo2.mkb.ru/ 195.191.77.240 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.: 12 script elements without defer/async. Warning: CSS / JavaScript found without GZip support. Send these ressources with GZip. 13 external CSS / JavaScript files without GZip found - 1 with GZip, 14 complete A Good: All images with internal compression not sent via GZip. Images (.png, .jpg) are already compressed, so an additional GZip isn't helpful. 3 images (type image/png, image/jpg) found without additional GZip. Not required because these images are already compressed 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, 13 with Cache-Control, but no max-age, 0 with Cache-Control max-age too short (minimum 7 days), 1 with Cache-Control long enough, 14 complete. Warning: Images with a missing or too short Cache-Control header found. Browsers should cache and re-use these files. 0 image files without Cache-Control-Header, 4 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. A Good: All checked attribute values are enclosed in quotation marks (" or '). A Good: Some img-elements have a valid alt-attribute.: 5 img-elements found, 1 img-elements with correct alt-attributes (defined, not an empty value). Wrong: img-elements without alt-attribute or empty alt-attribute found. The alt-attribute ("alternative") is required and should describe the img. So Screenreader and search engines are able to use these informations.: 4 img-elements without alt-attribute, 0 img-elements with empty alt-attribute found. 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 http://vbo2.mkb.ru/ 195.191.77.240 Strict-Transport-Security: max-age=31536000; Parse Error - Header can't be parsed https://vbo2.mkb.ru/ 195.191.77.240 Strict-Transport-Security: max-age=31536000; Parse Error - Header can't be parsed http://vbo2.mkb.ru/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 195.191.77.240 Strict-Transport-Security: max-age=31536000; Parse Error - Header can't be parsed http://vbo2.mkb.ru/ 195.191.77.240 Warning: HSTS header sent via http has no effect https://vbo2.mkb.ru/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de 2.333 seconds Warning: 404 needs more then one second A Duration: 238657 milliseconds, 238.657 seconds