When logged into the Cisco GUI for one of my 6 Aironet 2600's whenever I attempt to make a change in the Server Manager it redirects to an unavailable web page (HTTP 400). This happens whenever I attempt to Delete a RADIUS server from the server list, change the shared secret for one of the servers. And it also happens when I attempt to make changes to the Default Server Priorities (ie, Priority 1 and 2 for EAP Authentication)
I have tried this is Chrome, Firefox, Edge, and IE11. All fail with their own respective error pages.
Below is an example of what happens when I attempt to delete one of the Servers off the Server list.