One hour After my login at tty1, I am kicked off and the screen shows:

..--------------------------------------------------.
| tux, you have been on for 60 min. |
| You'll be logged off in 120 sec. so finish up. |
`--------------------------------------------------'

If i login again, then i am kicked again after several minutes:

..--------------------------------------------------.
| tux, you have just been kicked off. |
| Make off, don't try it again, today. |
`--------------------------------------------------'

and i get the following mail:

>From root Sat Dec 10 16:02:20 2005

To: tux
Subject: ++WARNING - LOG-OFF ++

Your session-limit will be reached soon.
tux: You've been on for 60 min.
You'll be logged off in 120 sec.
So finish up, please.

>From root Sat Dec 10 16:04:43 2005

To: tux
Subject: Logged off, you were idle

Subject: Excess Idle Time

Logged off - tux - Sat Dec 10 16:04:43 2005

- excess idle time -
on tty = tty1

>From root Sat Dec 10 16:08:48 2005

To: tux
Subject: Logged off, you were idle

Subject: Excess Idle Time

Logged off - tux - Sat Dec 10 16:08:48 2005

- excess idle time -
on tty = tty1

>From root Sat Dec 10 16:11:24 2005

To: tux
Subject: Logged off, you were idle

Subject: Excess Idle Time

Logged off - tux - Sat Dec 10 16:11:24 2005

- excess idle time -
on tty = tty1

Anyone has an idea? //bow

Pan