Apache Free Radius module error

Hi, For one of my projects I have to set up two factor authentication. I have used Apache Free Radius module which acts as a client to Radius server. This setup is already been done and 2FA is working fine. But, I'm having an issue. If I get authenticated, it will stay authenticated (forever apparently) in both FF and IE browser, also if I supply invalid username or password, I get a "Authorization Required" response (that apparently stays forever too). But, In Chrome I didn't notice this behavior. Whenever I refresh the page, it apparently prompts for the username and password. Can someone please suggest on this. Thanks in advance. -- Thanks and Regards, Jeevan Mithyantha