SSL-Tools

SSL check results of gwdg.de

NEW You can also bulk check multiple servers.

Discover if the mail servers for gwdg.de can be reached through a secure connection.

To establish a secure connection a mail server has to offer STARTTLS (SSL), a trustworthy SSL certificate, support for the Diffie-Hellman-Algorithm to guarantee Perfect Forward Secrecy and must not be vulnerable against the Heartbleed attack. Futhermore we recommend using end-to-end encryption with GnuPG.

Summary

JSON Refresh

Report created Mon, 07 Jun 2021 07:41:07 +0000

No connection to the mailservers of gwdg.de could be established.

Servers

Incoming Mails

These servers are responsible for incoming mails to @gwdg.de addresses.

Hostname / IP address Priority STARTTLS Certificates Protocol
c1234.mx.srv.dfn.de
194.95.238.102
Results incomplete
50
supported
not checked
DANE
errors
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
a1234.mx.srv.dfn.de
194.95.232.102
Results incomplete
50
supported
not checked
DANE
errors
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s
b1234.mx.srv.dfn.de
194.95.234.102
Results incomplete
50
supported
not checked
DANE
errors
PFS
supported
Heartbleed
not vulnerable
Weak ciphers
not found
  • TLSv1.2
  • SSLv3
1 s

Outgoing Mails

We have received emails from these servers with @gwdg.de sender addresses. Test mail delivery

Host TLS Version & Cipher
gmailer.gwdg.de (134.76.11.17)
TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384
imailer.gwdg.de (134.76.11.19)
TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384

Certificates

No Certificates found

DANE

DNS-based Authentication of Named Entities (DANE) is a protocol to allow X.509 certificates to be bound to DNS using TLSA records and DNSSEC.

Name Options DNSSEC Matches
_25._tcp.c1234.mx.srv.dfn.de
  • DANE-EE: Domain Issued Certificate
  • Use full certificate
  • SHA-256 Hash
valid
—
_25._tcp.a1234.mx.srv.dfn.de
  • DANE-EE: Domain Issued Certificate
  • Use full certificate
  • SHA-256 Hash
valid
—
_25._tcp.b1234.mx.srv.dfn.de
  • DANE-EE: Domain Issued Certificate
  • Use full certificate
  • SHA-256 Hash
valid
—