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Problem

You attempt to start an SSL channel with mutual authentification (receiver has SSLCAUTH(REQUIRED)) and you get this error message.


Cause

This may happen when the SSL certificates do not have the correct Key Usage attributes.


Resolution

If you change SSLCAUTH to OPTIONAL the channel starts!

Then the Key Usage must be:

  - Either blank, OR

  - If not blank, it must include HANDSHAKE

For instance, a certificate with this Key Usage will not work: Key Usage: DATAENCRYPT

This will work: Key Usage: HANDSHAKE, DATAENCRYPT


More info here.

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