Help me please

Hi friends, thank for various suggestions. pls i'm having problem with Sun App Server 8.1 and 8.2. I installed Portal 7 on Red Hat Enterprise Linux 3 and also Sun Portal 6 on Suse Linux 9. The problem is that App server keep giving Login exception after using them for a while. The details is given below:

after typing ./asadmin start-domain --user admin domain1. Instead of it to give me the password prompt, it threw the following exception:

INFO: SEC5046: Audit: Authentication refused for [admin]

Login Failed javax.security. auth.login.LoginException: Failed file for login admin

CL1156 could not start the domain domain1.

I always login to the O/S as root.

Any suggestion will be highly appreciated. Thanks

[756 byte] By [tolunike] at [2007-11-26 8:46:48]