Blocking application port

[csienke]

Hello,

can somebody tell me please how to close an existing application port? I wolud like to write a program that blocks the packets of an application, if the application is not digitaly signed.
I used EnumProcess and now I have a list with the .exe paths and PIDs (process id-s) too.

Thank you in anticipation for any help.

[xander_tan]

Hello,

can somebody tell me please how to close an existing application port? I wolud like to write a program that blocks the packets of an application, if the application is not digitaly signed.
I used EnumProcess and now I have a list with the .exe paths and PIDs (process id-s) too.

Thank you in anticipation for any help.

Hi there, what you want to do is actually making a "firewall-like" application. I read this article in codeproject (sometimes ago) that you might be interested: http://www.codeproject.com/KB/IP/FwHookDrv.aspx

[csienke]

Hi, thank you for the link. I tried out the source code, but unfortunately it doesn't work with Vista
I tried it out on one pc with two applications that communicate on a specified port.

Is there any solution to block packet sending in C++ under Vista?

[xander_tan]

Hi, thank you for the link. I tried out the source code, but unfortunately it doesn't work with Vista
I tried it out on one pc with two applications that communicate on a specified port.

Is there any solution to block packet sending in C++ under Vista?

Maybe you could try to use Windows Filtering Platform (WFP), this is the link: http://www.microsoft.com/whdc/device/network/wfp.mspx

I never tried this before though.