The server has reached the maximum number of connections it supports.
Any action to correct the problem should be performed on that computer. The server is supporting the maximum number of connections.
To make another connection to the server, first end a current connection. If you have no connections that you can end, try your command again later. You will be able to make your connection once another user's connection is ended. Also, see your network administrator. Your administrator may want to increase the value of the MAXCONNECTIONS entry of the server's configuration file.