Forum users marked as Guests

Hi

I am having a strange issue in SAP Forums Application.

my Netweaver 7.31 Portal is configured for Multidomain LDAP.

there are two domain.

domain_1 and domain_2.

while users from domain_1 can access the contents of Forums, Users of Domain_2 are not able to access the Forums and are being termed as Guests.

Another thing which i observed is:

if i add permission to users from domain_1 in Forum Admin, the users show in the permissions grid.

whereas if i add permission to users from domain_2 in Forum Admin, the users does not show in the permissions grid and automatically the permissions for registered users are enabled.

How to solve this?

Any one faced such issue?

Regards

Rajendra