The error you posted is definitely expected whenever you get the Bind Failure. The bind failure is telling us that we were not able to bind to the port (usually because it is already in use). Since we cannot bind to the port it would be impossible to use this port for communication, thus the "Unable to connect to backend device" error.
If you are using a web browser, make sure you don't have multiple tabs or browsers open to PAM, they will conflict with each other and cause this.
The same is true of the CA PAM Client. Check task manager for extra CA PAM Client processes & kill them. It is possible that there was a problem when closing the client and the process got stuck.
You could also use the netstat utility to see if another process is holding the port open for some reason.
If all else fails, try rebooting your workstation. This should clear any bound ports.
As for the session timeout issue that you are seeing, this is likely a cache problem. When this happens try clearing the cache in the Browser & Java or the PAM Client.
-Christian