Problem to login

I now login as "postgres" user to the Cent OS 6.5 server but I've got the attached problem

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HuaMin ChenProblem resolverAsked:
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Gary PattersonVP Technology / Senior Consultant Commented:
Nothing attached.
HuaMin ChenProblem resolverAuthor Commented:
Please see this
Gary PattersonVP Technology / Senior Consultant Commented:
Looks like a common problem.  

Several troubleshooting options for this popped up with a quick search.  Did you try just doing a Google search on the error message?  

That's often a great first troubleshooting step.

The issue seems to be related to security, but there seem to be a variety of different fixes.  These threads have a lot of narrative on the problem and possible resolutions - too much to reproduce here.  I suggest you review them, try the most common, and let us know what you've tried.  I combed through the top search responses and selected these, which seem to contain the most valuable troubleshooting information.  I hope you find it useful.

- Gary
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Gerwin Jansen, EE MVETopic Advisor Commented:
Try deleting that file as root or move it as root to something else:

#mv /var/lib/pgsql/.ICEauthority /var/tmp

The relogin as postgres
Joseph OLoughlinIT Support SpecialistCommented:
You should not normally be logging into a service account
HuaMin ChenProblem resolverAuthor Commented:
Thanks all.
does it mean it is of no meaning to login as user "postgres"?
Joseph OLoughlinIT Support SpecialistCommented:
You will have administrative/root rights to the postgres database

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