Deploying NetFwTypeLib to manage the Windows Firewall

Question

My Windows service needs to create/remove certain rules from the Windows firewall. For this I interface with NetFwTypeLib in <windows>\system32\hnetcfg.dll via COM. It works great on my 64-bit Windows 7 machine, but testing on another 64-bit Windows 7 machine throws the following error:

Service cannot be started. System.IO.FileNotFoundException:
Could not load file or assembly 'Interop.NetFwTypeLib, 
   Version=1.0.0.0, Culture=neutral,
   PublicKeyToken=null' or one of its dependencies.
   The system cannot find the file specified.

I have a feeling that if I embed and install the assembly with my application, I would have problems with different versions of Windows and between 32-bit and 64-bit.

How do I solve this missing assembly deployment issue?

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Edit: This seems to be a VS2010 issue for any target framework except 4.0. Does anyone have a fix for this?

Answer 1

NetFwTypeLib object doesn't reside in hnetcfg.dll library on Windows 7 Ultimate. Rather, it resides in FirewallAPI.dll at %system32%\FirewallAPI.dll (eg c:\windows\system32\FirewallAPI.dll).

using NetFwTypeLib; // Add reference %SystemRoot%\System32\FirewallAPI.dll

Answer 2

What a weird error! The best i can think of is don't rely on the System32 version of the DLL, copy it into your folder and call it from there. From my knowledge, i don't think the DLL should conflict with the different bit computers, but if they do then just obtain a different DLL from a 32 bit computer and have separate downloads for x64 and x86. Good luck!

EDIT: Also, i have had some trouble with programming in 3.5 or lower in VS2010. Try to get a version of visual c# express 2008 and try with that (usually fixes a lot of errors with downgrading .net versions)

Answer 3

I had an issue with this same dll when working in Visual Studio 2012. For me the fix was to manually move the interop.NetFwTypeLib.dll into the directory I was working from. This seemed to fix the issue for me. Hope it helps