I can not enable or disable a port for PoE. When I try to save changes I get a popup error that says "Data is Invalid" and it will not save the changes. All of the ports are setup the exact same. I have Ports 1-19 enabled and working, I need to enable 20,21,22.
Not sure what other type of information is needed to help narrow to an answer. I have not had trouble with this before as I have enabled a port just a few months ago and I have not made any configuration changes to the router in a few years.