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I've been out of the linux admin game for at least 5 years and I could use some help. I've been asked to check on why the control software on a new windows machine can't talk to a device that is running SUSE Linux Enterprise Server 9. At first it's just that there wasn't a route to the subnet that the windows machine was on. I managed to fix that, but now the SUSE server is refusing connections on the ports that the windows server is trying to talk over. As near as I can tell, it's just that nothing is listening on the ports that the software is trying to connect to. I don't think the SUSE server is running any firewall software, but how do I confirm?
I had tried the telnet to the port before posting, and it didn't work. Now I find out that they gave me the wrong port number *d'oh*. A telnet to the correct port number works, but the software still doesn't. Sounds like a software issue to me...
That firewall is pretty restrictive, only allowing communications on ports 80,443,591. If you can safely stop the firewall, do so. This would be a quick and easy way to tell if its causing your issues. Or add the port manually to iptables (iptables -A INPUT -p tcp --dport <portNum> -j ACCEPT) to see if that also solvs the problem. May also have to add the udp protocol.
Also try netstat -l (lowercase L) and see if your port you need is listed.
Last edited by josh.engelbrecht; 11-24-2010 at 02:44 PM.
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