I've got a customer who has Forefront TMG client installed in addition to our Layered Service Provider (LSP).
I understand Forefront uses a callout LSP while our LSP does all its logic in process. We've found that when both LSPs are installed (even when our LSP is acting as a passthrough), the system starts misbehaving. iTunes is unable to connect to the iTunes store, and other client-server applications crash (sending windows error reports).
Are there any strategies for debugging this or configuration settings that I can suggest to work around this?