Check DNS, Urls + Redirects, Certificates and Content of your Website


Info: Problems with 3.048.289 Letsencrypt certificates (378.325 accounts). They must be revoked (revocation starts 2020-03-04 20:00 UTC) - see Revoking certain certificates on March 4. Update 2020-03-07: Good news: Mass-revocation is canceled.

This tool: A check (SerialNumber) is added. Letsencrypt has published a list of critical SerialNumbers, this list is checked. See the part "9. Certificates". If there is a warning, renew that certificate and replace the current certificate.




S

Server error

Checked:
11.02.2020 21:44:02


Older results

No older results found


1. IP-Addresses

HostTIP-Addressis auth.∑ Queries∑ Timeout
mail.clt.dk
A
158.248.202.74
Holstebro/Central Jutland/Denmark (DK) - Altibox Danmark
Hostname: 74.158-248-202.customer.lyse.net
yes
1
0

AAAA

yes


www.mail.clt.dk

Name Error
yes
1
0


2. DNSSEC

Zone (*)DNSSEC - Informations (beta)

Zone: (root)
(root)
1 DS RR published



Status: Valid because published



2 DNSKEY RR found



Public Key with Algorithm 8, KeyTag 20326, Flags 257 (SEP = Secure Entry Point)



Public Key with Algorithm 8, KeyTag 33853, Flags 256



1 RRSIG RR to validate DNSKEY RR found



Algorithm: 8, 0 Labels, original TTL: 172800 sec, Signature-expiration: 02.03.2020, 00:00:00, Signature-Inception: 10.02.2020, 00:00:00, KeyTag 20326, Signer-Name: (root)



Status: Good - Algorithmus 8 and DNSKEY with KeyTag 20326 used to validate the DNSKEY RRSet



Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 20326, DigestType 2 and Digest "4G1EuAuPHTmpXAsNfGXQhFjogECbvGg0VxBCN8f47I0=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone

Zone: dk
dk
1 DS RR in the parent zone found



1 RRSIG RR to validate DS RR found



Algorithm: 8, 1 Labels, original TTL: 86400 sec, Signature-expiration: 24.02.2020, 17:00:00, Signature-Inception: 11.02.2020, 16:00:00, KeyTag 33853, Signer-Name: (root)



Status: Good - Algorithmus 8 and DNSKEY with KeyTag 33853 used to validate the DS RRSet in the parent zone



2 DNSKEY RR found



Public Key with Algorithm 8, KeyTag 24435, Flags 256



Public Key with Algorithm 8, KeyTag 32195, Flags 257 (SEP = Secure Entry Point)



1 RRSIG RR to validate DNSKEY RR found



Algorithm: 8, 1 Labels, original TTL: 86400 sec, Signature-expiration: 10.03.2020, 13:06:02, Signature-Inception: 11.02.2020, 11:36:02, KeyTag 32195, Signer-Name: dk



Status: Good - Algorithmus 8 and DNSKEY with KeyTag 32195 used to validate the DNSKEY RRSet



Status: Valid Chain of trust. Parent-DS with Algorithm 8, KeyTag 32195, DigestType 2 and Digest "FnyzZSBI9HgiLpWNHK2QfX7LKOelRd4BuFka0p6sZEQ=" validates local Key with the same values, Key ist Secure Entry Point (SEP) of the zone

Zone: clt.dk
clt.dk
0 DS RR in the parent zone found



DS-Query in the parent zone has a valid NSEC3 RR as result with the hashed domain name between the hashed NSEC3-owner and the hashed NextOwner. So the parent zone confirmes the non-existence of a DS RR.Bitmap: NS, DS, RRSIG



0 DNSKEY RR found





Zone: mail.clt.dk
mail.clt.dk
0 DS RR in the parent zone found



0 DNSKEY RR found





Zone: www.mail.clt.dk
www.mail.clt.dk
0 DS RR in the parent zone found


3. Name Servers

DomainNameserverNS-IP
www.mail.clt.dk
  ns1.gratisdns.dk

mail.clt.dk
  ns1.gratisdns.dk
217.61.111.93
Frankfurt am Main/Hesse/Germany (DE) - Aruba GmbH Cloud Network DC05

clt.dk
  ns1.gratisdns.dk


  ns2.gratisdns.dk


  ns3.gratisdns.dk


  ns4.gratisdns.dk


  ns5.gratisdns.dk

dk
  a.nic.dk


  b.nic.dk


  c.nic.dk / LHR1


  l.nic.dk / l.nic.dk


  p.nic.dk / 3.fra.pch


  s.nic.dk / ns-ext1a.sidn.nl


4. SOA-Entries


Domain:dk
Primary:b.nic.dk
Mail:tech.dk-hostmaster.dk
Serial:1581453601
Refresh:600
Retry:300
Expire:1814400
TTL:300
num Entries:1


Domain:dk
Primary:b.nic.dk
Mail:tech.dk-hostmaster.dk
Serial:1581453721
Refresh:600
Retry:300
Expire:1814400
TTL:300
num Entries:5


Domain:clt.dk
Primary:ns1.gratisdns.dk
Mail:hostmaster.gratisdns.dk
Serial:2019121201
Refresh:14400
Retry:3600
Expire:2419000
TTL:43200
num Entries:5


Domain:mail.clt.dk
Primary:ns1.gratisdns.dk
Mail:hostmaster.gratisdns.dk
Serial:2019121201
Refresh:14400
Retry:3600
Expire:2419000
TTL:43200
num Entries:1


5. Screenshots (Beta)

Startaddress: https://mail.clt.dk, address used: https://mail.clt.dk/, Screenshot created 2020-02-15 00:02:35 +00:0 url is insecure, certificate invalid

Mobil (412px x 732px)

436 milliseconds

Screenshot mobile - https://mail.clt.dk/
Screen (1280px x 1680px)

744 milliseconds

Screenshot Desktop - https://mail.clt.dk/
Mobil + Landscape (732px x 412px)

464 milliseconds

Screenshot mobile landscape - https://mail.clt.dk/

Mobile- and other Chrome-Checks

widthheight
visual Viewport396732
content Size396803

Good: No horizontal scrollbar. Content-size width = visual Viewport width.

Chrome-Connection: secure. secure connection settings. The connection to this site is encrypted and authenticated using TLS 1.2, ECDHE_RSA with P-256, and AES_128_GCM.

Chrome-Resources : secure. all served securely. All resources on this page are served securely.

6. Url-Checks


:

:
Domainname Http-StatusredirectSec.G
• http://mail.clt.dk/
158.248.202.74 GZip used - 3256 / 11510 - 71.71 %
200

Html is minified: 211.19 %
0.076
H
Date: Tue, 11 Feb 2020 20:44:43 GMT
Server: Apache/2.4.7 (Ubuntu)
Last-Modified: Sat, 11 Apr 2015 20:06:35 GMT
ETag: "2cf6-513786af99cb2-gzip"
Accept-Ranges: bytes
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 3256
Connection: close
Content-Type: text/html

• https://mail.clt.dk/
158.248.202.74
503

Html is minified: 107.65 %
2.470
N
Service Temporarily Unavailable
Certificate error: RemoteCertificateNameMismatch, RemoteCertificateChainErrors
Server: nginx/1.17.5
Date: Tue, 11 Feb 2020 20:44:43 GMT
Content-Type: text/html
Content-Length: 197
Connection: close

• http://mail.clt.dk/.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de
158.248.202.74
Inline-JavaScript (∑/total): 0/0 Inline-CSS (∑/total): 0/0
404

Html is minified: 100.00 %
0.076
A
Not Found
Visible Content: Not Found The requested URL /.well-known/acme-challenge/check-your-website-dot-server-daten-dot-de was not found on this server. Apache/2.4.7 (Ubuntu) Server at mail.clt.dk Port 80
Date: Tue, 11 Feb 2020 20:44:46 GMT
Server: Apache/2.4.7 (Ubuntu)
Content-Length: 343
Connection: close
Content-Type: text/html; charset=iso-8859-1

7. Comments

Aname "mail.clt.dk" is subdomain, public suffix is "dk", top-level-domain-type is "country-code", Country is Denmark, tld-manager is "Dansk Internet Forum"
Agood: All ip addresses are public addresses
Agood: No asked Authoritative Name Server had a timeout
ADNS: "Name Error" means: No www-dns-entry defined. This isn't a problem
Agood - only one version with Http-Status 200
AGood: Some urls with http status 200/404 have a complete Content-Type header (MediaType / MediaSubType + correct charset):1 complete Content-Type - header (2 urls)
http://mail.clt.dk/ 158.248.202.74


Url with incomplete Content-Type - header - missing charset
Hfatal error: No https - result with http-status 200, no encryption
HFatal error: http result with http-status 200, no encryption. Add a redirect http ⇒ https, so every connection is secure. 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.
Nhttps://mail.clt.dk/ 158.248.202.74
503

Error - Certificate isn't trusted, RemoteCertificateNameMismatch, RemoteCertificateChainErrors
AGood: Nameserver supports TCP connections: 1 good Nameserver
AGood: Nameserver supports Echo Capitalization: 1 good Nameserver
AGood: Nameserver supports EDNS with max. 512 Byte Udp payload, message is smaller: 1 good Nameserver
AGood: 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: ns1.gratisdns.dk: 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.
AGood: All SOA have the same Serial Number
Agood: CAA entries found, creating certificate is limited: letsencrypt.org is allowed to create certificates
AGood: 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.
AInfo: No img element found, no alt attribute checked
AGood: 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
AInfo: Different Server-Headers found
ADuration: 68716 milliseconds, 68.716 seconds


8. Connections

DomainIPPortCert.ProtocolKeyExchangeStrengthCipherStrengthHashAlgorithmOCSP stapling
Domain/KeyExchangeIP/StrengthPort/CipherCert./StrengthProtocol/HashAlgorithmOCSP stapling
mail.clt.dk
158.248.202.74
443
Certificate/chain invalid and wrong name
Tls12
ECDH Ephermal
255
Aes256
256
Sha384
error checking OCSP stapling
ok
mail.clt.dk
158.248.202.74
443
Certificate/chain invalid and wrong name
Tls12

ECDH Ephermal
255
Aes256
256
Sha384
error checking OCSP stapling
ok
http/2 via ALPN supported  Tls.1.2
no Tls.1.1
no Tls.1.0
http/2 via ALPN supported Tls.1.2
no Tls.1.1
no Tls.1.0
Self signed certificate
1CN=letsencrypt-nginx-proxy-companion


9. Certificates

1.
1.
CN=letsencrypt-nginx-proxy-companion
11.02.2020
10.02.2021
expires in 315 days

1.
1.
CN=letsencrypt-nginx-proxy-companion
11.02.2020

10.02.2021
expires in 315 days


KeyalgorithmRSA encryption (4096 bit)
Signatur:SHA256 With RSA-Encryption
Serial Number:5B9EFC14DE67D7058D287876936CCC78B0D99D9A
Thumbprint:8E9512053B4EA5A4074801D48A0830A0AE637F67
SHA256 / Certificate:+n/3UiqxK1tfGWXiVw0sejjA5YBq0Fg8ZgR6pBuwlrE=
SHA256 hex / Cert (DANE * 0 1):e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
SHA256 hex / PublicKey (DANE * 1 1):06429c0051dbf23b34fbd4487077e7bc69b657d2ef9e85b17e31b249aed0e7d5
SHA256 hex / Subject Public Key Information (SPKI):40ea4acfddceea1d4a60d3df111da1c633f2791edcfb8fde6feb5128029b2cb5
SPKI checked via https://v1.pwnedkeys.com/spki-hash:Good: Key isn't compromised
OCSP - Url:
OCSP - must staple:no
Certificate Transparency:no

UntrustedRoot: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.


10. Last Certificates - Certificate Transparency Log Check

1. Source CertSpotter - active certificates (one check per day)

Issuerlast 7 daysactivenum Certs
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
0
2
2

CertSpotter-IdIssuernot beforenot afterDomain namesLE-Duplicatenext LE
1430380465
leaf cert
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2020-02-13 22:21:07
2020-05-13 22:21:07
autoconfig.claustoft.dk, autoconfig.clt.dk, autodiscover.claustoft.dk, autodiscover.clt.dk, mail.clt.dk - 5 entries


1429313129
leaf cert
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2020-02-13 09:40:37
2020-05-13 09:40:37
autoconfig.claustoft.dk, autodiscover.claustoft.dk, mail.clt.dk - 3 entries



2. Source crt.sh - old and new certificates, sometimes very slow (Update 2020-01-11: Should now work again - code updated. Old message: currently no newer certificates - read Crt.sh has stopped - Letsencrypt-forum - may work next week again - 2019-12-02 - but I must check the code).

Issuerlast 7 daysactivenum Certs
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
0 /0 new
2
3

CRT-IdIssuernot beforenot afterDomain namesLE-Duplicatenext LE
2459271263
precert
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2020-02-13 21:21:07
2020-05-13 20:21:07
autoconfig.claustoft.dk, autoconfig.clt.dk, autodiscover.claustoft.dk, autodiscover.clt.dk, mail.clt.dk
5 entries


2457268020
leaf cert
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2020-02-13 08:40:37
2020-05-13 07:40:37
autoconfig.claustoft.dk, autodiscover.claustoft.dk, mail.clt.dk
3 entries


1128840530
leaf cert
CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
2019-01-20 20:07:55
2019-04-20 19:07:55
imap.clt.dk, mail.clt.dk, smtp.clt.dk, webmail.clt.dk
4 entries



11. Html-Content - Entries

No Html-Content entries found. Only checked if https + status 200/401/403/404


12. CAA - Entries

DomainnameflagNameValue∑ Queries∑ Timeout
mail.clt.dk
32773
issue
letsencrypt.org
1
0
clt.dk
0

no CAA entry found
1
0
dk
0

no CAA entry found
1
0


13. TXT - Entries

DomainnameTXT EntryStatus∑ Queries∑ Timeout
clt.dk
v=spf1 ip4:158.248.202.74 ~all
ok
1
0
mail.clt.dk

ok
1
0
_acme-challenge.mail.clt.dk

Name Error - The domain name does not exist
1
0
_acme-challenge.mail.clt.dk.clt.dk

Name Error - The domain name does not exist
1
0
_acme-challenge.mail.clt.dk.mail.clt.dk

Name Error - The domain name does not exist
1
0


14. Portchecks

Domain or IPPortDescriptionResultAnswer
mail.clt.dk
21
FTP



mail.clt.dk
21
FTP



mail.clt.dk
22
SSH



mail.clt.dk
22
SSH



mail.clt.dk
25
SMTP
open
220-mail.clt.dk ESMTP Postcow 220 mail.clt.dk ESMTP Postcow

mail.clt.dk
25
SMTP
open
220-mail.clt.dk ESMTP Postcow 220 mail.clt.dk ESMTP Postcow

mail.clt.dk
53
DNS



mail.clt.dk
53
DNS



mail.clt.dk
110
POP3



mail.clt.dk
110
POP3



mail.clt.dk
143
IMAP



mail.clt.dk
143
IMAP



mail.clt.dk
465
SMTP (encrypted)



mail.clt.dk
465
SMTP (encrypted)



mail.clt.dk
587
SMTP (encrypted, submission)
open
220 mail.clt.dk ESMTP Postcow

mail.clt.dk
587
SMTP (encrypted, submission)
open
220 mail.clt.dk ESMTP Postcow

mail.clt.dk
993
IMAP (encrypted)



mail.clt.dk
993
IMAP (encrypted)



mail.clt.dk
995
POP3 (encrypted)



mail.clt.dk
995
POP3 (encrypted)



mail.clt.dk
1433
MS SQL



mail.clt.dk
1433
MS SQL



mail.clt.dk
2082
cPanel (http)



mail.clt.dk
2082
cPanel (http)



mail.clt.dk
2083
cPanel (https)



mail.clt.dk
2083
cPanel (https)



mail.clt.dk
2086
WHM (http)



mail.clt.dk
2086
WHM (http)



mail.clt.dk
2087
WHM (https)



mail.clt.dk
2087
WHM (https)



mail.clt.dk
2089
cPanel Licensing



mail.clt.dk
2089
cPanel Licensing



mail.clt.dk
2095
cPanel Webmail (http)



mail.clt.dk
2095
cPanel Webmail (http)



mail.clt.dk
2096
cPanel Webmail (https)



mail.clt.dk
2096
cPanel Webmail (https)



mail.clt.dk
2222
DirectAdmin (http)



mail.clt.dk
2222
DirectAdmin (http)



mail.clt.dk
2222
DirectAdmin (https)



mail.clt.dk
2222
DirectAdmin (https)



mail.clt.dk
3306
mySql



mail.clt.dk
3306
mySql



mail.clt.dk
5224
Plesk Licensing



mail.clt.dk
5224
Plesk Licensing



mail.clt.dk
5432
PostgreSQL



mail.clt.dk
5432
PostgreSQL



mail.clt.dk
8080
Ookla Speedtest (http)



mail.clt.dk
8080
Ookla Speedtest (http)



mail.clt.dk
8080
Ookla Speedtest (https)



mail.clt.dk
8080
Ookla Speedtest (https)



mail.clt.dk
8083
VestaCP http



mail.clt.dk
8083
VestaCP http



mail.clt.dk
8083
VestaCP https



mail.clt.dk
8083
VestaCP https



mail.clt.dk
8443
Plesk Administration (https)



mail.clt.dk
8443
Plesk Administration (https)



mail.clt.dk
8447
Plesk Installer + Updates



mail.clt.dk
8447
Plesk Installer + Updates



mail.clt.dk
8880
Plesk Administration (http)



mail.clt.dk
8880
Plesk Administration (http)



mail.clt.dk
10000
Webmin (http)



mail.clt.dk
10000
Webmin (http)



mail.clt.dk
10000
Webmin (https)



mail.clt.dk
10000
Webmin (https)



158.248.202.74
21
FTP



158.248.202.74
21
FTP



158.248.202.74
22
SSH



158.248.202.74
22
SSH



158.248.202.74
25
SMTP
open
220-mail.clt.dk ESMTP Postcow 220 mail.clt.dk ESMTP Postcow

158.248.202.74
25
SMTP
open
220-mail.clt.dk ESMTP Postcow 220 mail.clt.dk ESMTP Postcow

158.248.202.74
53
DNS



158.248.202.74
53
DNS



158.248.202.74
110
POP3



158.248.202.74
110
POP3



158.248.202.74
143
IMAP



158.248.202.74
143
IMAP



158.248.202.74
465
SMTP (encrypted)



158.248.202.74
465
SMTP (encrypted)



158.248.202.74
587
SMTP (encrypted, submission)
open
220 mail.clt.dk ESMTP Postcow

158.248.202.74
587
SMTP (encrypted, submission)
open
220 mail.clt.dk ESMTP Postcow

158.248.202.74
993
IMAP (encrypted)



158.248.202.74
993
IMAP (encrypted)



158.248.202.74
995
POP3 (encrypted)



158.248.202.74
995
POP3 (encrypted)



158.248.202.74
1433
MS SQL



158.248.202.74
1433
MS SQL



158.248.202.74
2082
cPanel (http)



158.248.202.74
2082
cPanel (http)



158.248.202.74
2083
cPanel (https)



158.248.202.74
2083
cPanel (https)



158.248.202.74
2086
WHM (http)



158.248.202.74
2086
WHM (http)



158.248.202.74
2087
WHM (https)



158.248.202.74
2087
WHM (https)



158.248.202.74
2089
cPanel Licensing



158.248.202.74
2089
cPanel Licensing



158.248.202.74
2095
cPanel Webmail (http)



158.248.202.74
2095
cPanel Webmail (http)



158.248.202.74
2096
cPanel Webmail (https)



158.248.202.74
2096
cPanel Webmail (https)



158.248.202.74
2222
DirectAdmin (http)



158.248.202.74
2222
DirectAdmin (http)



158.248.202.74
2222
DirectAdmin (https)



158.248.202.74
2222
DirectAdmin (https)



158.248.202.74
3306
mySql



158.248.202.74
3306
mySql



158.248.202.74
5224
Plesk Licensing



158.248.202.74
5224
Plesk Licensing



158.248.202.74
5432
PostgreSQL



158.248.202.74
5432
PostgreSQL



158.248.202.74
8080
Ookla Speedtest (http)



158.248.202.74
8080
Ookla Speedtest (http)



158.248.202.74
8080
Ookla Speedtest (https)



158.248.202.74
8080
Ookla Speedtest (https)



158.248.202.74
8083
VestaCP http



158.248.202.74
8083
VestaCP http



158.248.202.74
8083
VestaCP https



158.248.202.74
8083
VestaCP https



158.248.202.74
8443
Plesk Administration (https)



158.248.202.74
8443
Plesk Administration (https)



158.248.202.74
8447
Plesk Installer + Updates



158.248.202.74
8447
Plesk Installer + Updates



158.248.202.74
8880
Plesk Administration (http)



158.248.202.74
8880
Plesk Administration (http)



158.248.202.74
10000
Webmin (http)



158.248.202.74
10000
Webmin (http)



158.248.202.74
10000
Webmin (https)



158.248.202.74
10000
Webmin (https)





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