If a connector remains in the installed state for a long period of time, then might not be running or might be unable to communicate with the Message Queue.
On the machine where the connector is installed, look in the audit and error logs for potential errors. For example, if the connector can not connect to the Message Queue, then that error log will report the problem. If the connector can not connect to the Message Queue, see Troubleshooting the Message Queue Component for possible causes.
If the most recent messages in the audit log are old, then the connector may not be running. See Troubleshooting the Watchdog Process and Core Components for information about starting the connector.