This happened after some time while the session was in progress.
The ics_dyn log on the LAG showed the following at around that time:
Created new IAUser
At that time the session tight to the injection of the credentials was lost causing the request for credentials to show.
Once this was configured correctly this was no longer seen.
There is a check for source IP address when the cookie is set and at the time a new request within the same session comes in via a different source address this will cause a new IAuser to be created causing the problems seen.
A way to disable the IP address check is the following:
Create the following touch file.
lagDisableAuthIPCheck Located in the /etc directory on the LAG.
Enabling this touch file switches off the proxy authentication cookie binding to client IP.
Creating the File
To create a file, use the following command as a root user:
For Example, touch /etc/lagDisableAuthIPCheck