VPN client agent was unable to create the interprocess communication depot

I am getting an error while trying to establish a connection to the secure gateway; AnyConnect VPN client was not able to establish a connection to the specified secure gateway. Please try connecting again.
I have tried to connect again many times, I have also tried with rebooting the machine and but still connected to VPN was not established. The problem seems to be intermittent though, because it did connect, it has been just fine over the past few days. Can anyone assist?
I am running VPN version 2.5.0217 on windows Vista.

Cisco AnyConnect VPN Client
The VPN client agent was unable to create the interprocess
communication depot.
