Running two firewalls at the same time ?

[[Mystik_Cool]]

I have the SuSE 8.0 linux version, with their SuSE-firewall2. I configured it (for those who know SuSE, I simply configured it with yast2, saying if I wanted the http, telnet, ... ports to be open or not).
But when I run a nmap on my system, I see that some ports are still open (like telnet !), and I don't want it to. I first tried to re-configure the SuSE firewall, being very carefull, and I didn't check the "telnet" option to stay open (I checked only the ssh), but the telnet port is still opened. And others, like finger, printer,... are still there, and I didn't see any option in the SuSE firewall configuration tool to close them.

So I'm planning to install another firewall (guarddog) for example. Is there any problem in running the two firewalls at the same time ?
And, about the SuSE firewall2, did anyone meet same problems ?

Many thanx !

[Radar]

Running two is not necessary. Read the security NHFs on this site to see about stopping unnecessary services.

Also, how did you scan your box? You should be scanning from outside the network.

[neondog]

Radar is right about stress testing the firewall from another machine (untrusted). You will get false positives if you test it locally.

[[Mystik_Cool]]

Ok I'll test it from the outside as soon as I can. I know it's useless to run two FW at the same time, but the question was, could it cause any problem ? But up to now, it seems that everything is fine.

Thanx !