Hi there, first the specs:

gw8.02hp2, novell data sync and mobility running on sles11, build is 428.

since today, only on user can sync items (HTC HD2) all other users (even the administrators, like me) can sync any items. The logs always show "failed to authenticate user <userid>", even fresh created testusers can't sync any items on every mobile device i got here (some old windows-mobile ones (worked on monday), samsung galaxy s and www.testexchangeconnectivity.com).
We didnt changed anything on the server itself for like a week or so. Logs on the firewall confirm that every user gets through on port 443, so the error comes from the mobility server himself. We also tried different authentifcation-methods (ldap and groupwise), but no change at all. Same logs and only one user can sync just fine.

I'm like out of ideas...can somebody point me in the right direction?