Hi Swetha,
Please answer below queries:
1)What is the version of your SAP PI System?
2)Is it a single or dual stack system ?
3)Are you facing similar issue for ID as well?
Also check if there is some issue with your Java Web Start and try to troubleshoot as mentioned in below link.
Troubleshooting PI ESR and Integration Builder Logon Issues - Process Integration - SCN Wiki
Regards
VJ