Intruder lockout issues - GMS2.1


End of June we had a password change . 2 month's later we have several users which lockout on a regulary basis.

We have to unlock them and then they can work. Some hours or a day later it locks again.

-Firefox / IE cleaned pw 's
-Upgrade novell client to version SP4

The users which have the issue also have a blackberry smartphone which is connected to GMS 2.1 system.

If we see the lockout screen the address is : 12#00000
Our loadbalanced ldap address.

Can we see somewhere which application or ip block's the user? Please a better way then the lockout screen ...

Our SR engineer is thinking about the GMS who is locking the accounts ..:
See following TID

Can somebody help?