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Re: firewall problems



On Sun, 16 Sep 2001, yaniv almog wrote:

> I have recently installed Red-Hat 7.1 at work. My computer is connected th
> the network via eth0. The problem is that my maschine no longeraccept
> telnet, ftp, or e-mail. I tried to disable the firewall: by the gnome-lokkit
> utility, by editing manually the ipchains script, by diabling the ipchains
> and iptables servieces, an finally by reinstalling the OS from scratch with
> the no-firewall option - with no success at all.

there are several reasons why your machine may not be accepting
connections:

* because they are blocked at the firewall level (check with 'iptables
-L' to see the firewall rules).
* because they are blocked at the inetd level, by tcpwrappers (possible.
check out your /etc/hosts.allow and /etc/hosts.deny)
* because the servers aren't running (check your /etc/inetd.conf or
/etc/xinetd.conf)
* because the servers aren't allowing the connection - this has to be
debugged on a per server basis.

based on your description, i would guess that it's inetd's fault,
whether on the tcp wrappers level or inetd leval. check the inetd
configuration file - on redhat 6.2 it's /etc/inetd.conf, but i think
inetd is called 'xinetd' in redhat 7.x.

also, 'man inetd' or 'man xinetd' should give you a lot of useful
information.

> Another problem, which is probably related to the above is that when I open
> linuxconf, I no longer see any mail configuration option, though sendmail is
> definitely running and I can send e-mail from my workstation.

sorry, this one i have no idea about.
-- 
mulix

http://www.advogato.com/person/mulix
http://www.sf.net/projects/syscalltrack



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