Would anti-virus software prevent a web service call from a WinFormsapp?

[JDeats]

I have a WinForms app (.NET 2.0) which has a web service reference and
the web service call is failing inside some corporate environments. I
know a proxy server could cause this problem, but does anyone know of
corporate anti-virus software that monitors TCP/IP port 80 that would
block any unknown desktop application?

I'm just trying to build a short list of most likely culprits

 

[Jeff Johnson]

I have a WinForms app (.NET 2.0) which has a web service reference and
the web service call is failing inside some corporate environments. I
know a proxy server could cause this problem, but does anyone know of
corporate anti-virus software that monitors TCP/IP port 80 that would
block any unknown desktop application?

I'm just trying to build a short list of most likely culprits

More than likely it's firewall software, not anti-virus software. And yes,
they can be configured to only allow access to specific sites, or disallow
access to specific sites, or disallow any access by non-whitelisted
processes (.exes), so simply hoping that by using port 80 you'll be home
free won't cut it.