Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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I have got access to a remote linux box, where I need to install my application. My app listens on certain TCP port expecting connections from outside world. I have started my app successfully and it has bound to a port and listening. Connection from localhost are ok. But I can not connect from outside world. I have tried different ports and I have found that port 8080-8082 are working, but not other random ports. It is like ports are block but I do not know where? iptables has no rules in it. netstat looks ok two.
I have not been given any additional information on how that remote box is connected to the internet. As far as I can tell it is a dedicated server at some hosting provider and it has a static ip. traceroute shows that there is another ip address in the same subnet, which connection goes through. I guess that could be a gate or a router but I have no access for it. Do you think ports could be blocked by the hosting provider's router?
Actually, I was asking about your connection to the remote Linux box. I was assuming that, by "remote" you had implied that your route was passing through some type of hardware connecting to a leased cable or similar infrastructure. My point was that the lease vendor often installs a hardware firewall on the connection that wouldn't necessarily be visible in the traceroute output. Actually, such a firewall could be at either end of your connection or internal to any switch through which your signal is passed (although, of course, switches - by definition - are supposed to pass every routable datagram). Some "switches" are internal to things like modems, and modems often do provide firewalls.
My box connection probably does not matter, since I have checked ports using third party public service like http://www.yougetsignal.com/tools/open-ports/ and they are seams to be blocked two.
Bu t I see your point. Bottomline, I would need to talk to hosting support first about this remote box connection specifics.