[Zope] zope username /password problem on our portal

[shyam]

we are running  a web portal using Zope created by
our previous administrator who doesn't work with us anymore.


The portal is up and running.

The problem:

After logging in as one of the portal users
when trying to access any information, it is now gives a pop-up
as Enter Username and Password for Zope.

The site has been working for about a year now without problems.

I don't know anything on Zope but am a another system admin.

Any help would be very appreciated.

thanks,  shyam