When editing a Listen Port via Policy Manager, the following error may be encountered upon saving the changes to the Listen Port:
Unable to modify the listen port for the current admin connection
This error occurs because the port is in use for the current administrative connection via Policy Manager. Changes cannot be saved to a Listen Port when it is currently open for the active Policy Manager session. For example: if connecting on port 8443 via Policy Manager, then changes cannot be made to Listen Port 8443.
To resolve the issue, perform the following steps: