Package review of the new tcsh617 package including a patch for this bz was successful. See bug 688166.
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: On a local machine, tcsh set the "REMOTEHOST" environment variable to an empty string, even though this variable should only have been set on a remote machine. This error has been fixed and REMOTEHOST is no longer set on a local machine.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-1072.html