Am 21.12.2014 um 20:03 schrieb Evgeniy Berdnikov:
  The first step in debugging should be cleaning up the configuration.
  If you have doubts, separate your private key and certificates,
  placing them into different files.

After testing some more, I've come to the following conclusions:

* Putting key and certificate in one file is fine.

* A key length of 4096 bit is fine.

* A certificate hash with SHA-512 is not fine. I need to use SHA-256
  instead.

Both Thunderbird and 'openssl s_client' work fine with a new certificate with a shorter hash size. Okay. It wasn't really necessary to use such paranoid settings, but I wanted to know what works. Now it seems that GnuTLS is limiting this while OpenSSL and other libraries can handle it. That's interesting.

--
Yves Goergen
http://unclassified.de
http://dev.unclassified.de

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