Windows 7 Forums

Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Windows firewall not blocking port

06 Nov 2010   #1
yonatan748

Windows 7 32bit
 
 
Windows firewall not blocking port

Hi

I need to block a specific UDP port both inbound and outbound. I have tried using Windows 7 firewall for this, but oddly it is not capable of blocking the port. I have been very meticulous with the firewall settings creating an inbound and outbound rule, but still it lets traffic through.

As a comparison I downloaded Comodo firewall, disabled Windows firewall and created the same rule blocking in/out UDP port. Comodo blocks traffic in both directions without an issue!

I know that I could stick with Comodo, but I'm curious if anyone knows why Windows firewall is failing.

Btw I used Wireshark to be certain that traffic was being blocked.

Thanks


My System SpecsSystem Spec
.
06 Nov 2010   #2
Jacee
Microsoft MVP

Windows 7 Ultimate 32bit SP1
 
 

Did you do this? Block a Port in Windows 7
My System SpecsSystem Spec
06 Nov 2010   #3
polarbear

Windows 7 Home Premium 64-bit
 
 

Great info Jacee!
My System SpecsSystem Spec
.

06 Nov 2010   #4
yonatan748

Windows 7 32bit
 
 

Quote   Quote: Originally Posted by Jacee View Post
Did you do this? Block a Port in Windows 7
Hi Jacee

Yes, that is exactly what I have done and the firewall still lets the traffic through. I have even reset the firewall to default and tried multiple times and every time it fails to block.
My System SpecsSystem Spec
06 Nov 2010   #5
Fayla

Windows 7 Professional 64 Bit SP1
 
 

So you added a in-bound and out-bound block for certain UDP port numbers in Windows firewall. However, your computer's installed traffic sniffer still picks it data from those ports?

Whatever port this is, I assume you have a program that uses the port(s) you want blocked? Is this program running and added into the permit list of Windows Firewall? If this is the case, your program's permit rule could be overriding the block rule(s) you added.

Also, for a more accurate picture, run the wire shark tool on a different computer.

Quote   Quote: Originally Posted by yonatan748 View Post
Hi

I need to block a specific UDP port both inbound and outbound. I have tried using Windows 7 firewall for this, but oddly it is not capable of blocking the port. I have been very meticulous with the firewall settings creating an inbound and outbound rule, but still it lets traffic through.

As a comparison I downloaded Comodo firewall, disabled Windows firewall and created the same rule blocking in/out UDP port. Comodo blocks traffic in both directions without an issue!

I know that I could stick with Comodo, but I'm curious if anyone knows why Windows firewall is failing.

Btw I used Wireshark to be certain that traffic was being blocked.

Thanks
My System SpecsSystem Spec
06 Nov 2010   #6
Jacee
Microsoft MVP

Windows 7 Ultimate 32bit SP1
 
 

This is free ... see if it works |MG| Windows 7 Firewall Control 3.5.1.131 Download
My System SpecsSystem Spec
06 Nov 2010   #7
Greg S

Windows 7 Professional 32-bit (6.1, Build 7600)
 
 

Quote   Quote: Originally Posted by Jacee View Post
Did you do this? Block a Port in Windows 7
Quote:
  1. Note: You can prevent outbound traffic by selecting Outbound Rules.
That tutorial is kinda mis-leading for outbound. It's my understanding that Outbound would have to be enabled. One can create as many outbound rules as you'd like but without enabling it means very little with outbound being allowed by default. But, I may be the one mis-understanding,lol.
My System SpecsSystem Spec
06 Nov 2010   #8
yonatan748

Windows 7 32bit
 
 

OK that's for all the suggestions, but I have just tried to block again and used another computer with wireshark and it is still letting traffic through! My opinion on this is that Windows firewall is flawed or not as robust as it should be. I've followed the links that you posted Jacee to make sure that I was doing it right (and I was) and still no go.

I guess I will use Comodo firewall as it behaves properly.

Thanks
My System SpecsSystem Spec
06 Nov 2010   #9
yonatan748

Windows 7 32bit
 
 

Quote   Quote: Originally Posted by Rei Tumult View Post
So you added a in-bound and out-bound block for certain UDP port numbers in Windows firewall. However, your computer's installed traffic sniffer still picks it data from those ports?

Whatever port this is, I assume you have a program that uses the port(s) you want blocked? Is this program running and added into the permit list of Windows Firewall? If this is the case, your program's permit rule could be overriding the block rule(s) you added.

Also, for a more accurate picture, run the wire shark tool on a different computer.
I checked and the program was not checked in the permit list! Regarding wireshark I just tried sniffing from a different computer and applying the firewall on the other one and wireshark still detects the traffic.

Also see my reply above. Thanks
My System SpecsSystem Spec
Reply

 Windows firewall not blocking port




Thread Tools





Similar help and support threads
Thread Forum
Windows firewall blocking .exe file even after firewall is disabled
Hey everyone, This is my first post, and first time I've not been able to solve my problem by searching previous posts...so hopefully someone can help me out. I'm trying to install a downloaded .exe file, and Windows firewall is blocking it regardless of whether the firewall is active or not; the...
System Security
Windows firewall blocking media streaming
Hey there, So I'm using windows 7 64bit and am trying to set up homegroup with my ps3 problem i have is i can't turn on media streaming, network discovery,or file and printer sharing. if i turn network discovery and file sharing on they just reset to off and if i click turn on media streaming...
Network & Sharing
Windows Firewall blocking Fileserve
Hi, l'am having a problem,which is,l can't download anything from file sharing site Fileserve if Windows Firewall is on,if l turn it off the it works fine. And only seems to block Fileserve,Rapidshare,megaupload,Filesonic & depositfiles all work with when Windows Firewall is on. How can I...
System Security
Firewall blocking all windows and MSE updates
Hi, We're using Windows 7 with Windows Firewall and MSE. The firewall isn't allowing either Windows or MSE to automatically update. In order for the updates to take place, we have to disable the firewall off, complete the update and then re-enable the firewall :shock:...not really a good...
System Security
Windows 7 firewall blocking internet.
Hi, I have a fresh install of Windows 7 Home Premium 64bit on a new hard drive. I have only installed 5 programs. CorelDraw, Adobe Creative Suite CS3, Jing (screen capture utility) Webroot Antivirus -Anti-Spyware for Windows 7 and WIDCOMM Bluetooth software for Win 7. I installed Corel and...
System Security
firewall or kaspersky 8 blocking port in utorrent
I am having some trouble with utorrent and getting an open port, I narrowed the problem to either windows firewall or kaspersky 8 or even both. If i disable firewall and kaspersky I can get an open port, but once I turn them on utorrent slows down indicating the port is not open. I have included...
System Security

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 21:38.

Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App