SASL Authentication Problem

[Timotheus Pokorra]

what springs to my mind is this:
> 2015-08-25 12:01:02,059 pykolab.auth DEBUG [1293]: Section example.com has
> no option 'auth_mechanism'
> 2015-08-25 12:01:02,060 pykolab.auth DEBUG [1293]: Starting LDAP...
> 2015-08-25 12:01:02,060 pykolab.auth DEBUG [1293]: Connecting to LDAP...
> 2015-08-25 12:01:02,061 pykolab.auth DEBUG [1293]: Attempting to use LDAP

in my setup, I have:
2015-08-25 18:28:58,881 pykolab.auth DEBUG [5941]: Called for domain
'example.org'
2015-08-25 18:28:58,882 pykolab.auth DEBUG [5941]: Called for domain None
2015-08-25 18:28:58,882 pykolab.auth DEBUG [5941]: Using section
example.org and domain example.org
2015-08-25 18:28:58,883 pykolab.auth DEBUG [5941]: Using section
example.org and domain example.org
2015-08-25 18:28:58,883 pykolab.auth DEBUG [5941]: Connecting to
Authentication backend for domain example.org
2015-08-25 18:28:58,883 pykolab.auth DEBUG [5941]: Section kolab has
auth_mechanism: 'ldap'
2015-08-25 18:28:58,883 pykolab.auth DEBUG [5941]: Starting LDAP...
2015-08-25 18:28:58,883 pykolab.auth DEBUG [5941]: Connecting to LDAP...

How does your kolab.conf look like?
I don't have a section for each domain, and auth_mechanism = ldap from
section [kolab] is used.
You might need to add that line to your domain section, if you want to
have a section for each domain.

hope this helps,
  Timotheus