server 2003

i have 11 server 2003 computers in a lab environment all on the same network…while we can all ping each other using the ip address, i cannot connect to any of the boxes remotely from any other…after selecting a server from the browse list and trying to open it, the log on window pops up asking for the logon…the username/password for all of the boxes is the same but access/log on is denied…what should we do…thanks…