What is Blocking My Ports???

Microsoft Windows vista home premium - 3...
August 16, 2010 at 10:37:41
Specs: Microsoft Windows 7, 2.72 GHz / 2045 MB
For some reason, i cannot successfully forward a port on my router...I tried uninstalling my virus scan and spyware scanner, but it hasn't helped at all. I can pick ANY port, but it will still appear to be blocked. How can i tell what program is responsible?

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August 16, 2010 at 11:29:02
Does your pc have a static ip?
How are you determining the ports are blocked at the pc?
What specifically are you trying to forward and why?

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August 16, 2010 at 13:10:14
Yes, i have a static IP. I'm trying to set up an FTP program, but every port try to forward through from the router says it's blocked. I also use a torrent program to get podcasts, but that says the port i forwarded for it is blocked too. I'm just trying to figure out how i can determine which program is blocking it.

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August 16, 2010 at 14:58:24
"but every port try to forward through from the router says it's blocked"

What exactly says this? Where are you getting this message from?

In any case, FTP requires at least two ports to operate. You know that, right?

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August 16, 2010 at 15:06:26
Gee that was my second question; how are you determining this?

The way you phrase the words BNeLLi531 makes me wonder. You do understand that forwarding is not from your pc outward but from the internet to your pc?

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August 16, 2010 at 16:20:48
Gee, guess I'll just let you handle this, then :p

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August 16, 2010 at 16:40:50
I understand the concept of port forwarding and have been forwarding ports through my router since prior to wireless internet...I'm glad you guys are trying to rule out the "user error" portion of my question, but you still haven't answered the one thing i've been asking. Is there a way for me to tell which program is blocking the port???

I can tell my port is blocked because my torrent client says "Listen Port of TCP: 63569 (blocked by Firewall/Router). Yet, i have that port forwarded in the router setup. I have done this many times before and never had this problem with it.

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August 16, 2010 at 17:27:57
Can't provide an answer without information to base it on.

Your conclusion is its software on your pc. The obvious start is windows firewall but you don't mention any software firewall programs anywhere in your posts.

What does netstat say about your 63569 port?

Go to Shields UP! and do a port scan of that port. What is the response?

Do you have any ports forewarded now that are working?
Have you considered just opening the port vs forwarding the port?

hey larrynotcableguy didn't mean to run you off. More the merrier as far as I am concerned.

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December 23, 2010 at 11:32:19
lol, the question is SIMPLE. Is there a way to detect something that's blocking a port.

Likewise i havn't seen a program, cmd line, or any other way that's widley known to accomplish what you're asking for OP, other than hit & miss.

I too have ports that i need to open, however, it's not firewalls, service provider, or other obvious software that's blocking these ports.

It's likely something from the computer that's blocking these ports.

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March 12, 2011 at 08:11:26
Most ftp programs like my favorite - filezilla, use port 21 (or leave the area blank for the program to find an open port)for all connections. Port 21 is usually already opened for such applications as these.

Don't forget - using port forwarding on a router with crappy programming can actually block ports (I've had this happen). Make sure when you're troubleshooting, you turn port forwarding off at some point, and test other things.

But before all that, try port 21, and if that doesn't work, leave the area blank so the program can find the port itself (input this into the FTP program). Don't use port forwarding to do this.

Xamire Networks

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