We have a number of users who are getting "tree or server cannot be found" when they try to login. The version on the client on their PC is 4.91.x. Before now, they have been able to log onto their PCs with no problem. In order to get some of the users logged in we had to click on advanced, remove the tree, select the right context and put in the IP address of the server. Does anyone have any ideas as to what could be causing this? The workstations are Windows XP SP2.