Hey Santosh,
Instead of corp\sgandra_con, just use sgandra_con and see if that works.
FYI:
Fully Qualified Domain Name (FQDN) - of a user, is a user name including the domain name. E.g. In your case it would be sgandra_con@corp.<domainname>.com (That domainname can be your companyname.
Similarly FQDN is also used for Server names as SHE-CICSQLP1.corp.<domainname>.com
Thanks,
Mahboob Mohammed