1. General Results, most used to calculate the result A name "cdn.giftcardsea.com" is subdomain, public suffix is ".com", top-level-domain is ".com", top-level-domain-type is "generic", tld-manager is "VeriSign Global Registry Services", num .com-domains preloaded: 85538 (complete: 220007) A Good: All ip addresses are public addresses A Good: Minimal 2 ip addresses per domain name found: cdn.giftcardsea.com has 4 different ip addresses (authoritative). A Good: Ipv4 and Ipv6 addresses per domain name found: cdn.giftcardsea.com has 2 ipv4, 2 ipv6 addresses 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):4 complete Content-Type - header (5 urls) https://cdn.giftcardsea.com/404.shtml Url with incomplete Content-Type - header - missing charset A http://cdn.giftcardsea.com/ 104.21.94.153 https://cdn.giftcardsea.com/ Correct redirect http - https with the same domain name A http://cdn.giftcardsea.com/ 172.67.137.200 https://cdn.giftcardsea.com/ Correct redirect http - https with the same domain name A http://cdn.giftcardsea.com/ 2606:4700:3035::ac43:89c8 https://cdn.giftcardsea.com/ Correct redirect http - https with the same domain name A http://cdn.giftcardsea.com/ 2606:4700:3036::6815:5e99 https://cdn.giftcardsea.com/ Correct redirect http - https with the same domain name B https://cdn.giftcardsea.com/ 104.21.94.153 Missing HSTS-Header B https://cdn.giftcardsea.com/ 172.67.137.200 Missing HSTS-Header B https://cdn.giftcardsea.com/ 2606:4700:3035::ac43:89c8 Missing HSTS-Header B https://cdn.giftcardsea.com/ 2606:4700:3036::6815:5e99 Missing HSTS-Header B https://cdn.giftcardsea.com/404.shtml Missing HSTS-Header P https://104.21.94.153/ 104.21.94.153 Error creating a TLS-Connection: No more details available. P https://172.67.137.200/ 172.67.137.200 Error creating a TLS-Connection: No more details available. P https://[2606:4700:3035:0000:0000:0000:ac43:89c8]/ 2606:4700:3035::ac43:89c8 Error creating a TLS-Connection: No more details available. P https://[2606:4700:3036:0000:0000:0000:6815:5e99]/ 2606:4700:3036::6815:5e99 Error creating a TLS-Connection: No more details available. A Good: More then one ip address per domain name found, checking all ip addresses the same http status and the same certificate found: Domain cdn.giftcardsea.com, 4 ip addresses. Info: Checking the ip addresses of that domain name not exact one certificate found. So it's impossible to check if that domain requires Server Name Indication (SNI).: Domain cdn.giftcardsea.com, 4 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.cdn.giftcardsea.com 2. Header-Checks (alpha, started 2022-10-23, may be buggy / incomplete) A cdn.giftcardsea.com 104.21.94.153 report-to Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=w%2FPSTA2RZYv%2FU4gnKmI5P9GIIi6iLSXU6fQnzfvNEq7eAky7p5nPnZFrXXNIlLoRN8XelANIjTpEBErPDOUqklJ6ZNXv62%2FCyzU2WuzSPHzp9VDy513qtsZfGSGEj2WwUEL0M8xV"}],"group":"cf-nel","max_age":604800} A Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=w%2FPSTA2RZYv%2FU4gnKmI5P9GIIi6iLSXU6fQnzfvNEq7eAky7p5nPnZFrXXNIlLoRN8XelANIjTpEBErPDOUqklJ6ZNXv62%2FCyzU2WuzSPHzp9VDy513qtsZfGSGEj2WwUEL0M8xV"}],"group":"cf-nel","max_age":604800} A cdn.giftcardsea.com 172.67.137.200 report-to Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=SFl7H5%2FkKcxmDeNRns0FneSl%2Fu3ftNwn1%2B3p%2BChSI1rfGsiS0o0H5NmvIFf1CfKPf%2B4z%2BhwW4gEpJ0f1E2Vfbd019fLPZN%2B9wHzLiudf%2FmH06nq6sPjnbkur8DeBwHLZPNGrykN3"}],"group":"cf-nel","max_age":604800} A Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=SFl7H5%2FkKcxmDeNRns0FneSl%2Fu3ftNwn1%2B3p%2BChSI1rfGsiS0o0H5NmvIFf1CfKPf%2B4z%2BhwW4gEpJ0f1E2Vfbd019fLPZN%2B9wHzLiudf%2FmH06nq6sPjnbkur8DeBwHLZPNGrykN3"}],"group":"cf-nel","max_age":604800} A cdn.giftcardsea.com 2606:4700:3035::ac43:89c8 report-to Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=1M5aydCAMALe4WFCGu%2BZD1sKErWlEZe%2FLz4XKCMobh2lMa3d5iVRKvxyGK1X2FqjE1eDDqFENhzDZh%2Fnp0MShH6uEdoyTnYLatMlGDoTXucl3BLNjZgBu50bCCH%2FDCptK%2F02ta1MEw4G6bVxwEa9t02M"}],"group":"cf-nel","max_age":604800} A Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=1M5aydCAMALe4WFCGu%2BZD1sKErWlEZe%2FLz4XKCMobh2lMa3d5iVRKvxyGK1X2FqjE1eDDqFENhzDZh%2Fnp0MShH6uEdoyTnYLatMlGDoTXucl3BLNjZgBu50bCCH%2FDCptK%2F02ta1MEw4G6bVxwEa9t02M"}],"group":"cf-nel","max_age":604800} A cdn.giftcardsea.com 2606:4700:3036::6815:5e99 report-to Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=Hur7gB3jJ7U0UxNmHir6%2FcmQyUI7Mq0KsVyFdLFsAQC%2FhcaLc5%2BSxeWzMLCD7fA4wPmmUA4A25rU%2FdpglWXoKkNVIAqT%2BjGj%2FsFE5XsnI4T4aeaM3xcaLXMQIT6k24bhdCDFULXqXq%2FYXNofWhBQLiYA"}],"group":"cf-nel","max_age":604800} A Ok: Header without syntax errors found: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=Hur7gB3jJ7U0UxNmHir6%2FcmQyUI7Mq0KsVyFdLFsAQC%2FhcaLc5%2BSxeWzMLCD7fA4wPmmUA4A25rU%2FdpglWXoKkNVIAqT%2BjGj%2FsFE5XsnI4T4aeaM3xcaLXMQIT6k24bhdCDFULXqXq%2FYXNofWhBQLiYA"}],"group":"cf-nel","max_age":604800} F cdn.giftcardsea.com 104.21.94.153 Content-Security-Policy Critical: Missing Header: F cdn.giftcardsea.com 104.21.94.153 X-Content-Type-Options Critical: Missing Header: F cdn.giftcardsea.com 104.21.94.153 Referrer-Policy Critical: Missing Header: F cdn.giftcardsea.com 104.21.94.153 Permissions-Policy Critical: Missing Header: F cdn.giftcardsea.com 172.67.137.200 Content-Security-Policy Critical: Missing Header: F cdn.giftcardsea.com 172.67.137.200 X-Content-Type-Options Critical: Missing Header: F cdn.giftcardsea.com 172.67.137.200 Referrer-Policy Critical: Missing Header: F cdn.giftcardsea.com 172.67.137.200 Permissions-Policy Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3035::ac43:89c8 Content-Security-Policy Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3035::ac43:89c8 X-Content-Type-Options Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3035::ac43:89c8 Referrer-Policy Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3035::ac43:89c8 Permissions-Policy Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3036::6815:5e99 Content-Security-Policy Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3036::6815:5e99 X-Content-Type-Options Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3036::6815:5e99 Referrer-Policy Critical: Missing Header: F cdn.giftcardsea.com 2606:4700:3036::6815:5e99 Permissions-Policy Critical: Missing Header: 3. DNS- and NameServer - Checks A Info:: 7 Root-climbing DNS Queries required to find all IPv4- and IPv6-Addresses of 2 Name Servers. A Info:: 7 Queries complete, 7 with IPv6, 0 with IPv4. A Good: All DNS Queries done via IPv6. Ok (4 - 8):: An average of 3.5 queries per domain name server required to find all ip addresses of all name servers. A Info:: 2 different Name Servers found: brett.ns.cloudflare.com, nola.ns.cloudflare.com, 2 Name Servers included in Delegation: brett.ns.cloudflare.com, nola.ns.cloudflare.com, 2 Name Servers included in 1 Zone definitions: brett.ns.cloudflare.com, nola.ns.cloudflare.com, 1 Name Servers listed in SOA.Primary: brett.ns.cloudflare.com. A Good: Only one SOA.Primary Name Server found.: brett.ns.cloudflare.com. A Good: SOA.Primary Name Server included in the delegation set.: brett.ns.cloudflare.com. 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: brett.ns.cloudflare.com, nola.ns.cloudflare.com 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 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: com Warning: All Name Servers have the same domain name. If there is a problem with that domain name (or with the name servers of that domain name), your domain may be affected. Better: Use Name Servers with different domain names / different top level domains.: Only one domain name used: cloudflare.com A Good: Name servers with different Country locations found: 2 Name Servers, 3 Countries: CA, CR, GB A Info: Ipv4-Subnet-list: 6 Name Servers, 3 different subnets (first Byte): 108., 172., 173., 3 different subnets (first two Bytes): 108.162., 172.64., 173.245., 6 different subnets (first three Bytes): 108.162.192., 108.162.193., 172.64.32., 172.64.33., 173.245.58., 173.245.59. A Good: Name Server IPv4-addresses from different subnet found: A Info: IPv6-Subnet-list: 6 Name Servers with IPv6, 3 different subnets (first block): 2606:, 2803:, 2a06:, 3 different subnets (first two blocks): 2606:4700:, 2803:f800:, 2a06:98c1:, 4 different subnets (first three blocks): 2606:4700:0050:, 2606:4700:0058:, 2803:f800:0050:, 2a06:98c1:0050:, 4 different subnets (first four blocks): 2606:4700:0050:0000:, 2606:4700:0058:0000:, 2803:f800:0050:0000:, 2a06:98c1:0050:0000: A Good: Name Server IPv6 addresses from different subnets found. A Good: Nameserver supports TCP connections: 6 good Nameserver A Good: Nameserver supports Echo Capitalization: 6 good Nameserver A Good: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 6 good Nameserver A Good: Nameserver has passed 10 EDNS-Checks (OP100, FLAGS, V1, V1OP100, V1FLAGS, DNSSEC, V1DNSSEC, NSID, COOKIE, CLIENTSUBNET): 6 good Nameserver Nameserver doesn't pass all EDNS-Checks: brett.ns.cloudflare.com: 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 https://cdn.giftcardsea.com/404.shtml Fatal: Check of /.well-known/acme-challenge/random-filename has a http status 500 - 599, Server Error. Creating a Letsencrypt certificate via http-01 challenge can't work. Trouble creating a certificate? Use https://community.letsencrypt.org/ to ask. A Good: Every https result with status 200 has a minified Html-Content with a quota lower then 110 %. A Good: Every https connection via port 443 supports the http/2 protocol via ALPN. 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 A Duration: 112223 milliseconds, 112.223 seconds