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Router won't forward ports

post #1 of 10
Thread Starter 
I'm using a Buffalo N300 Airstation (WHR-HP-G300N, DD-WRT) and I've tried forwarding ports but whenever I check them they come up as closed. Anyone have any ideas on what's wrong?
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post #2 of 10
Your ISP might be blocking your ports, try checking your external IP and the one assigned to your router/modem, then maybe contact or research if the ISP blocks ports. Mine has me on a sub network and blocks all ports which makes routing impossible.
Edited by gerickjohn - 5/17/13 at 11:31am
   
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post #3 of 10
Thread Starter 
Seems like my ISP, Optimum, only blocks port 80 and I have the option to enable it. Doesn't explain everything else; I'm trying to open 27000 through 27030
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post #4 of 10
can you see them open on your local network?
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post #5 of 10
Thread Starter 
How do you test ports on LAN?
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post #6 of 10
get a copy of nmap from
http://nmap.org/download.html

pop in the intenral IP address of the computer you want to scan (preferably from another pc tongue.gif) and click start, itll tell you if the ports open or closed or firewalled
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post #7 of 10
Thread Starter 
Quote:
Originally Posted by Ulquiorra View Post

get a copy of nmap from
http://nmap.org/download.html

pop in the intenral IP address of the computer you want to scan (preferably from another pc tongue.gif) and click start, itll tell you if the ports open or closed or firewalled

Didn't try this yet but... I've been told Buffalo routers have problems with opening ports. Is this true? Anyone else with a buffalo router have problems? Maybe I should try updating to the latest version of DD-WRT

It seems there are no newer builds of DD-WRT for my router
Edited by geoxile - 5/17/13 at 6:50pm
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post #8 of 10
Thread Starter 
Tried nmap, it starts up a cmd prompt and then immediately closes. Still can't get these ports open...
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post #9 of 10
Usually it's a software firewall on the server type of issue.
Quote:
Originally Posted by Ulquiorra View Post

get a copy of nmap from
http://nmap.org/download.html

pop in the intenral IP address of the computer you want to scan (preferably from another pc tongue.gif) and click start, itll tell you if the ports open or closed or firewalled

This is kind of a short-sighted approach. A lot of default configurations will accept traffic from source IPs that are in your LAN subnet, but nothing else. Since you're trying to set up a service viewable from the WAN (external IP) this would likely be denied by default.

For testing you can disable the software firewall. If it makes a difference, then you need to adjust your firewall rules for origination traffic.
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post #10 of 10
But then he can see if its actully up and running, start from the server n work back, confirm its on, conrim no firewall issues , confrim correct forward and youll have a working service

also it should have downlaoded "zenmap" (its just a gui)
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