SSL VPN only allowing one tunnel at a time...

Hello, when I try to access my VPN tunnel on one machine, it works flawlessly. When attempt to log in with a second machine, the user name and password prompt keeps coming up. The activity log says:

Mon Apr 09 19:38:47 2012 [*********X] Peer Connection Initiated with *********X
Mon Apr 09 19:38:50 2012 SENT CONTROL [************X]: 'PUSH_REQUEST' (status=1)
Mon Apr 09 19:38:50 2012 AUTH: Received AUTH_FAILED control message
Mon Apr 09 19:38:50 2012 TCP/UDP: Closing socket
Mon Apr 09 19:38:50 2012 SIGTERM[soft,auth-failure] received, process exiting
Mon Apr 09 19:38:50 2012 OpenVPN 2.1.1 i686-pc-cygwin [SSL] [LZO2] built on May 7 2010

I don't understand what is happening. Any clues?