Simreal,
thanks, for all the answers,
That would have been my solutions, but the box is hundreds of kilometers away from me and my local admin is on holiday.
The procedure you describe in the second post is correct, but only works when you are on the console, or if the system is still in multi-user mode.
when you start CMS from for example the cms or cmssvc user, it will just kick you off with the earlier mentioned message.
But I fixed this issue by doing the following;
It is the one-user issue that got me.
When the system goes into single -user mode it tells evryone they are logged off. One user got 'clever' and logged back in straight away, preventing me from logging in.
The way to 'fix' this is:
Log in as root
do a < who -u >
This will show you all active users.
Then do a <ps -edalf > and find all terminal processes these users have open.
Then just kill them by < kill 'PID#' >
This will alow you to quickly log back in and fix the issue...