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It is possible to have jobs that are pending in the queue or the device is receiving network traffic, so disconnect from the network and delete any pending jobs.
Thanks for the response. There are no pending jobs and I disconnected the network cable. This did not resolve the issue.
When I try to make a change via the web interface I get this message when I try to make a General change:
The requested operation cannot be processed.Possible causes are: A job is in progress
The web interface shows that the machine is ready. Is there another way to kill jobs for sure?
I found the problem. The fax line connected to the machine was being held in an unkown state by an upstream modem. Resetting the modem solved the issue and allowed my to access the settings on the front panel and via the web interface.
Thanks for your help!