saslauth (only) on port 25 failed

[SST Berlin]

Hi member !

KOLAB is running more than 1 year on my server, but first time I found an
error in my logs:

[...]
<debug> saslauthd[10150]: ldap_simple_bind() failed -1 (Can't contact LDAP
server).
<info> saslauthd[10150]: Retrying authentication
[...]

Problem: If user connects from Internet to SMTP Port 25 and try to
authenticate via sasl, this error happens.

LDAP is running, authentication on POP/IMAP works propper, no problems.
Nothing changed in confguration.

How can I find out whats the problem ?

Thank's to all !

--
regards
Dieter Soost
Soost Software Technology
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