@ character in username

Arati Desai artipdesai at yahoo.com
Tue May 15 10:56:29 EDT 2007

Hi All,
My user name contains '@' character as I need to host multiple domains on a single box.
I have created a user's principal as username\@domain at REALM. First @' character is escaped with a '\' while creating principal and generating a ticket.
But I am getting 'Invalid user' error when I try to login with this user while the kerb5 authentication succeeds for normal users. (I am using heimdal at the service's end for authentication, while the KDC is from MIT.)
Is '@' character supported in user name? If so, is there any special precaution to be taken while using such user names?

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