I'm using Load balancer to re-direct to userapplication login page. I'm able to get login page using http://LBipaddressort/IDMProv

But after entering the credential, i'm getting the following error.

An error occurred while attempting to contact the authentication service.

Please let me know what i'm doing wrong, it was working fine when i working fine and I was able to login when I was using localhost instead of LB.