Web chaining – what does it mean? It’s actually a clever method for allowing a TMG server to pass proxy clients on to another TMG server with Internet access. Configuring web chaining is relatively simple. The web chains have an interesting effect on reporting, as requests that are routed to the TMG server on the edge are logged with the original username, whereas requests directed to the remote TMG are logged at the edge server with the web chain user account. This article includes instructions for configuring web chaining as well as solutions for the reporting issue. Check it out:
http://www.fastvue.co/blog/forefront-tmg-web-chaining-and-reporting