On Mon, 6 Jan 2003, Hailong Li wrote:
> Hi there,
> My computer --- computer 1 is redhat 7.2. I can ssh from computer 1 to another
> linux computer --- computer 2. But I can not ssh from computer 2 to computer
> 1. I checked computer 1, sshd is on. When I installed Redhat 7.2 on computer
> 1, for Firewall, I selected "Default". Was there anything wrong about it?
First of all, test if the ssh problem is caused by the firewall.
Temporarily shut it down and see if ssh to computer 1 works again. Then
turn it back on. If you're running ipchains, "service ipchains stop" and
"service ipchains start" brings your firewall down and back up. If
"ipchains -L" shows something, ipchains is running.
I don't know what "Default" did during installation, but there
probably was something wrong with it. You can replace your current
firewall by running "gnome-lokkit", and in the course of answering its
questions, enable access to the ssh service. I believe it will install an
ipchains firewall. After you've used gnome-lokkit, which is designed for
beginners in linux, you may want to consider learning how to build
firewalls for yourself. Start with "man iptables" because by 7.2 ipchains
was becoming obsolete. Then look on the web for iptables documentation --
for example
http://www.netfilter.org/documentation/tutorials/blueflux/iptables-tutorial.html
--
Steven Yellin
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