Are you the author of the affected transparent proxy? Or someone using a transparent proxy created by another third-party developer? I'm just a user of a transparent proxy by another third-party developer. Whilst trying to debug why 24G817 had broken my internet access led me to this thread, so just wanted to confirm it, and also add that it was something about that specific build in particular that had broken it, as the transparent proxy had been working just fine on the previous 15.7.8 beta builds.

I am also seeing this on the 15.7.8 beta after updating to the 24G817 build specifically (issue was not present on the previous 15.7.8 build). Web search on this problem brought me to this thread, as well as other mentions that the 24G817 build broke Norton 360's Transparent Proxy, blocking Safari, update checks as well as most other (but not all) network traffic, which is the same behaviour I am seeing.