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I recently fixed up an old PowerEdge 1850 at my workplace. I did a clean install of Ubuntu 14.04LTS Server, using XFCE4 as the desktop environment for remote access.


Accessing it via it's local IP while I'm on the network is no problem. I can access SSH and the Apache webpage just fine. The problem is, I cant access anything about it via it's public IP.


I've opened a port (9500) for it in my router (Draytek Vigor 2925n). When I try to access it through:

1) a browser (chrome) I get ERR_CONNECTION_REFUSED.

2) putty gives Network error: Connection refused.

3) Running sudo netcat -l 9500 then trying to access xx.xxx.xxx.xx:9500 through putty shows I'm reaching the server:

SSH-2.0-PuTTY_Release_0.65

through chrome gives:

GET / HTTP/1.1
Host: xx.xxx.xxx.xx:9500
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-GB,en-US;q=0.8,en;q=0.6

4) sudo telnet xx.xxx.xxx.xx 9500 gives Unable to connect to remote host: Connection refused. It works for port 22, but I still can't SSH into the server.

5) sudo ssh -vvvv root@xx.xxx.xxx.xx asks for a password I don't have. Same with the username I use for local IP SSH "babar". However, I believe that is the SSH for the router, seeing as I don't give a port.

6) sudo nmap -p 9500 xx.xxx.xxx.xx gives 9500/tcp closed ismserver. This has me confused. If I open the ports on the router, nmap shows closed. If I don't open, the nmap shows filtered.


I'm quite sure this is a router problem as this is with a clean install and should be relatively straightforward. But any help troubleshooting and getting to the bottom of this would help.

Mykola
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Babar Shariff
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  • Nothing is listening. – user9517 Nov 10 '15 at 18:09
  • What do you mean nothing is listening? Do you mean the server itself isn't listening to the port? If so What command makes it listen. EDIT: I saw the similar question. I'll try that tomorrow and update if necessary. – Babar Shariff Nov 10 '15 at 18:38
  • I went full retard. In my router port redirection wasn't working so I opened ports instead. Today I realized I was redirecting to 198.xxx.x.xx instead of 192.xxx.x.xx. Everything is fine there are no problems... – Babar Shariff Nov 11 '15 at 10:44

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