I have 2 team city instances installed in the same box. One team city instance listens on port 8111 and the other one on 8112. Each instance works ok separately but when I open both instances at the same time in the same browser and I log on in one instance then I get logged off in the other one. I have no problems if I use different browsers though (e.g. explorer & firefox). I imagine there is a problem with cookies/sessions but I can not understand why as every team city instance is running on its own tomcat instance. Any thoughs??