1) Close all CA PAM sessions (both browser & CA PAM Client) and open a new one.
2) If the system has a firewall enabled, ensure that the port(s) in question are not blocked.
3) Is the port in use? It is possible to find out using basic networking commands:
The commands below will output all open ports along with the PID of the process that is using them. The PID can then be used to determine which process is holding the ports. If the process is not important or is hung then it can be killed which should release the port for use. If it turns out to be an important process or it is found that this message is seen often with a specific port then changing the TCP/UDP Service settings may be the best option.
Linux: # netstat -p
Mac: # lsof -Pnl +M -i4
Windows: > netstat -ao
On Lunix & Mac the PIDs of currently running processes can be found using the ps command: # ps -elf
On Windows the PIDs of currently running processes can be found using the tasklist command: > tasklist
4) Change any ports under 1024 to a number higher than 1024.