Hi,

I am using centos 6.5. if i try to access or login via static ip ,root password changes automatically after some time.And i am not able to login. kindly help me to solve this issue.how can my root password changes automatically?

First, you should not have remote root access enabled at all. It would be very good to turn that off completely. It is asking for trouble to have it on.

Second, how are you connecting to the remote machine? If the answer is FTP or Telnet instead of SFTP or SSH then pull the network cable out, you are overdue for wiping the hard drive and doing a clean installation.

Please say more about how you are connecting to the computer and how the problem is manifesting. What relevant entries are in /var/log/secure and the other logs?

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I am curious as to how you know the root password is changing and then how are you resolving the issue to know what the new password is?

Also, everything Turbocapitalist said

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The simple answer is that it should not be able to change automatically, and likely this is not happening.

Is this a shared access machine? Perhaps the root password changes because you're not supposed to be using it and an admin for that machine is detecting that you are logging in. Not trying to be accusatory here, I come from a very long time past where we had Vax and HP Ux mainframes and people really were logging in to the system with various credentials, and sometimes the ones they were not supposed to be using. But hey, ... if we could get the administrative logins, all being engineers, we "knew" what we were doing, we'd prefer to use those. In a large environment like that, invariably, a friend of a friend would eventually get the privileged passwords, slowly everyone would learn them and they'd start using them more and more; and then the real admin would detect it and change the password. Thus resetting the circle of life. For a few days.

Also many machines block root access unless you are at a physical, and local, console for that machine. This does not seem to be the case here, however in my opinion, it should be.