Inconsistent keys on the access device and the portal server
Symptom
When a user is forced to access the portal server, the portal server displays a blank webpage, rather than the portal authentication page or an error message.
Analysis
The keys on the access device and those on the portal server are not configured consistently, causing CHAP message exchange failure. As a result, the portal server does not display the authentication page.
Solution
Use the display portal server command to display the key for the portal server on the access device and view the key for the access device on the portal server.
Use the portal server command to modify the key on the access device or modify the key for the access device on the portal server to make sure that the keys are consistent.