Why is port closed after port forwarding?

vojtimanek · Aug 31, 2015

Hello, i have set up my port forwarding for ports 27015, 27016, 27017, but it says, that they are still closed, i don't know what should i do or what iam doing wrong...
I bound them to my internal ip (of the server) and using page yougetsignal.com to find out if they are open through my public ip.
Please help ASAP!

Someone Somewhere · Aug 31, 2015

It's possible you're behind a CG-NAT connection. Try this test: https://ip.bieringer.de/cgn-test.html

See if the public IPv4 address reported by that tool and by your router are the same. If not, you're behind CG-NAT.

If you're behind CG-NAT, you'll need to ask your ISP for a public IP address. There may be a fee of a few $ per month.

vojtimanek · Aug 31, 2015

I already pay for public IP address 5$/month.
How you use that test?

Someone Somewhere · Aug 31, 2015

Hit the 'test supported protocols' button, 'start initial test', then 'start normal test'. If there's no yellow or red dots, you should be OK.

If you're paying for a public IP, there shouldn't be a problem, though.

vojtimanek · Aug 31, 2015

Is it really so slow?

Someone Somewhere · Aug 31, 2015

Shouldn't take more than ~15s.

vojtimanek · Aug 31, 2015

Oh i have to use firefox... sorry

vojtimanek · Aug 31, 2015

Warnings:
During execution, browser window is blocked for at least shown estimated time
Unexpected behavior may occur when used via proxy or from a mobile device

orominio9 · Aug 31, 2015

Do you have the following set up:
Modem>>Router>>Server
or
Modem/Router>>Server ?

Keep in mind that in order to test Ports you need to have a Service waiting or listening to the port, if you dont have a Service behind the ports then its gonna show that the ports are closed.
1.Make sure your server IP is static
2.Enabled the service you want
3.Asign a Port for the service
4.Fordware the port on the Router to the Server and the Modem to the router(if your using scenario 1).
5.Try checking for the open port one a online portchecker website.

Let me know if that solve your problems.

LeKeiser · Aug 31, 2015

Hello,
A port is closed if the application that's using that port isn't launched and using it...
If I'm not mistaken, ports 270XX are used by Stream. Launch it and ports will then be opened.

vojtimanek · Sep 8, 2015

OK,
so i've got new modem/router today its Zyxel VMG1312-B30B.... Before i had Huawei hg622u, which could setup port forwarding but couldn't apply it...
This one should be able to handle it ok...
But i have no idea how should i set it up...
BTW: Yes my IP is static.
Modem/router -> switch -> server.
Using other port than 270XX didn't help, app was running while checking port...
TY, i was out for week, sorry...

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Why is port closed after port forwarding?

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