I never heard of this word rsh and also received a check list from Security pro that we have to disable rsh.
Can someone please tell me what is this rsh and how to disable it.
Base OS : RHEL 5.5 and 5.6
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rsh is remote shell and it is unencrypted, that's why you should disable it.
I don't know which OS you are talking about, but for RHEL (like sr_ already stated) edit
/etc/xinetd.d/rsh and set
disable = yes.
After that restart
xinetd and you're done.
Though I think, rsh should be disabled by default. Instead of rsh use ssh.
For more information on rsh read the man page.