Ok, a small update. another admin told me that it could be a timing issue. meaning that the response of the server Is sometimes too slow and therefore the system won´t login. (networktraffic etc.)
could that be possible? and if yes, how can I change the timing on the client?
As we have a really old network that can´t be changed I need a solution on apple side.
Interesting one, Ryback. It really looks like network when you mention bringing another known good workstation into the lab and it then exhibits the same/similar prolbem. How did you rule out the HP Switch? How do forward and reverse DNS lookups performed with Network Utility work in this room? Are they ok? What does the Console log look like immediately following a failed login?
I presume users that work in this lab have no problem when logging into their accounts from workstations at locations other than this lab...is that correct?