Detect proxy settings and ports

Hello forum, I have a project to find out which servers or applications/services are going through ISA 2006 proxy. The servers comprise of WIndows 2003 and 2008 R2 boxes. I tried proxcfg.exe (pre 2008) and netsh winhttp show proxy (post 2008) but I get following results. I know that these boxes do use proxy servers because they show up when I query ISA logs.

C:\proxycfg
Microsoft (R) WinHTTP Default Proxy Configuration Tool
Copyright (c) Microsoft Corporation. All rights reserved.

Current WinHTTP proxy settings under:
  HKEY_LOCAL_MACHINE\
    SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\
      WinHttpSettings :

     Direct access (no proxy server).


C:\netsh winhttp show proxy

Current WinHTTP proxy settings:

    Direct access (no proxy server).

I have also looked at registry keys HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings but found nothing of relevance. Checked IE settings and found no proxy configuration. How can I check which application or service is using proxy and on which port? Thanks again.