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problem forwarding port to desktop

Posted on 2015-02-11
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Last Modified: 2016-08-02
I was asked to forward 2 ports, 50501 to a server and 50502 to a desktop.  I created the rules in the router and setup the rules in windows firewall.  It worked fine for the server, but the desktop doesn't respond.  

Crazy thing is I disabled the rule on the router for the desktop, I checked on canyouseeme.org, it was able to detect the open port.  When I enable the rule on router, the port is no longer detected.

The desktop is running windows 7 pro.

Has anyone experienced this before?  What could be wrong?
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Question by:rrincones
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Expert Comment

by:Hypercat (Deb)
ID: 40604338
If the Windows firewall is on at the desktop, you may have to open that port in the Windows firewall settings as well. In that case, it would make sense that when you forward that port, it's seen as closed.
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Author Comment

by:rrincones
ID: 40604391
I created a rule on windows firewall for the port.  its allowed on all networks.  I even tried disabling the firewall.  The desktop was formatted and windows was reinstalled. no other antivirus or firewall is installed at this moment.
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Expert Comment

by:Stephen Berk
ID: 40604414
Check the Nat. I think the cysm port check is probably misleading and not actually getting to the intended desktop. You could post the relevant config info of the router if you want more specific help.
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Author Comment

by:rrincones
ID: 40604462
@Stephen Berk.  Why would it work for the server and not the desktop?
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Expert Comment

by:Stephen Berk
ID: 40604663
I don't know. I never troubleshoot that way, asking why something is happening now when it didn't happen before. I just take the problem and start troubleshooting. You created two nats or forwarding rules. One works and one doesn't. That's your problem definition. You say that when you disabled the port forward on the desktop, it was still forwarding. That doesn't make sense. Your router won't port forward unless you configure it to. So either the website is mistaken, or you have something misconfigured on the router. Let's assume the latter and have a look at the configuration. At least that's what I'd be interested in looking at. Others may have additional suggestions.
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Author Comment

by:rrincones
ID: 40606208
I didn't say it was still forwarding, I stated when I remove the port forwarding rule from the router, the website, canyouseeme.org, states it can see the computer on that port.  When I add it back, the website can no longer detect it.

How do I provide the configuration?  screen shots?
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LVL 38

Expert Comment

by:Hypercat (Deb)
ID: 40606319
Please provide the make/model of your router, and also a screen capture of both of the port forwarding rules that you're using for this purpose (server and workstation).
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Author Comment

by:rrincones
ID: 40606421
netgear r4500

port forwarding rules
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Accepted Solution

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rrincones earned 0 total points
ID: 41733240
Never received a solution.  Didn't matter in the end we decided not to use that software.
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Author Closing Comment

by:rrincones
ID: 41738616
never received a solution for the problem.
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Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

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