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Hi Yoori, re: > I followed your guideline. After I type "/etc/init.d/iptables restart", I > got the below message. > > [root@nopp root]# /etc/init.d/iptables restart > Flushing all current rules and user defined chains: [ OK ] > Clearing all current rules and user defined chains: [ OK ] > Applying iptables firewall rules: Bad argument `-' > Try `iptables-restore -h' or 'iptables-restore --help' for more information. > [FAILED] > [root@nopp root]# Hmm... I'll take a look. As soon as I saw your email, I logged onto your machine as 'ldm'. I immediately became 'root' and commented out the EXTERNAL action in /etc/sysconfig/iptabes and then turned the firewall back on. I will look into the iptables setting needed to allow SSH access by machines in the unidata.ucar.edu domain after I address the original issue. More later... Cheers, Tom **************************************************************************** Unidata User Support UCAR Unidata Program (303) 497-8642 P.O. Box 3000 address@hidden Boulder, CO 80307 ---------------------------------------------------------------------------- Unidata HomePage http://www.unidata.ucar.edu **************************************************************************** Ticket Details =================== Ticket ID: IXG-702275 Department: Support LDM Priority: Normal Status: Closed