If your previous connection failed with an error, you might get this error when you try to reconnect. Select thebutton in the Exit page to log out of the session and reconnect again.
Check to see if thelogs displays the following message:
No Buffer Space Available
This indicates that there is not enough buffer space. You must free memory space by closing some of the applications that are running, or by restarting the machine, then reconnecting to SSL VPN.