Alright. Connected via SSH (didnt think of that before) and "racadm racreset" and the session disappeared.
Hi, i have a DRAC4 inside a PowerEdge 850, and me and a colleague logged into it and tried to start Virtual Media Sessions from different remote computers. Now i have the situation that i cannot mount virtual media anymore, because i always get the error that another session is already active. "Unable to connect . Another Virtual Media session has already been established by another GUI sessions or VM-CLI command line tool."  I can see that session in session information, and i waited a couple hours for a timeout, but it does not go away. Even deleting the user who (supposedly) has the open session does not kill the session. So somehow it has not been closed correctly when my colleague tried to use different browser versions (Iceweasel / Firefox / etc) to get the media plugin working, and now it sits there forever. How can i kill that session, or reset the module, or something else so i can mount virtual media again?   Thanks
DRAC4: How to kill a virtual media session