When we try to remote login into Windows servers, sometimes we get a message saying maximum number of users/connections reached. To avoid this message and able to login; we can remote connect as as admin. Below commands when run through command prompt helps in remote login as admin
Windows 7/2008 Server:
mstsc.exe /admin /v:<yourservername>
Windows 2003 Server:
mstsc.exe /admin /v:<yourservername>
Once you login, from task manager you can check the Users tab and log off/disconnect the inactive users.