Your session has expired due to inactivity. You will be redirected to the login page where you can enter your username and password" on Internet Explorer while logging into Administration Console

Cause
This issue occurs due to underscores in the hostname.
Solution
To resolve this issue, do any of the following:
•Use the physical IP address.
•Use a different browser, like Mozilla Firefox, Chrome, or Safari.
•Make DNS entry changes on the server side.