Pop-up Blocker
If Popup Blocker is turned on then you will not be able to view the system pops for Invalid Password, Change password when the password expires and when you are forcefully logged out.
Procedure to enable system pop - ups for users having Windows XP Service Pack 2 installed on their machine
Step I :  Click on the Tools Menu of the IE browser window >> Pop-up Blocker >>Turn On Pop-up Blocker
Step II : Similarly, click on the Pop-up Blocker settings and add the system URL's to the Allow list of the Pop-up Blocker Settings as shown below to allow the system pop-ups to appear.
For e.g. Add the URL "http://www.olfb.com" in the field 'Address of Web site to allow:' and click on Add to allow system pop-ups.