I need to reboot an active app server in my farm. It has active sessions. I don't need to do it immediately but want to do it soon. Is the best method to do this simply to disable ICA protocol so no further sessions can connect and wait until users finish their active sessions? I have app 2 servers in the farm where all apps are published, will disabling ICA on one cause them to get any type of error when they try to connect or will they simply hit the other server until I re-enable ICA connections?