users sporadically can´t login in to useraccounts
today I come up with a strange problem.
my infrastructure
10.6 server (actual with all updates)
running services: afp, softwareupdate, ical, open directory
50 macs (pros, macminis imac, books etc.)
400 users
the problem
Since december 2012 all systems including the server where on 10.5.6.
Because of necessary software that don´t run under 10.5 I had to upgrade the clients and therefore I upgraded the server also.
Now I have a strange problem. There is one room with 15 Macpros - our main teachingroom. In this room, and it´s only there, sometimes user can´t login. They get the message that there is a problem with there account and therefore they can´t login. Than the user takes another machine in the room and there he/she can´t login but don´t get a message, the login-process just hangs, than the user tries another machine and there he/she can login. Sometimes the user needs two tries, sometimes five and sometimes it works without the problem???
It´s not depending on the user or the machine and I have absolutely no idea where the problem lies.
But it´s only in this room. My first idea was the managed hp switch in this room, but it´s not the problem.
Maybe it is about an correspondending application that is disturbing the login-process. But I´m not sure if this is possible.
As usual the Apple suport can´t help. Restart & install new are the commom solutions. hahah.
So it´s up to the community. Any suggestions? Ask me anything you need for other ideas. I don´t know what to do and my students are really upset about this problem. But I have no solution till now.