Thanks Chris for checking on this.
This SK seems unrelated though: it's about AD Query conflicting with Identity Agent, and how to prevent it from doing so.
Here, only Identity Agents are in use.
In this setup, I actually want to disable any form of IA from occurring from the connectors IPs, as the user access policy security is handled by the third party product.
A few users just happen to be running the Identity Agent on their computers (so that they get correctly identified when they're actually on site, vs remotely connected).
Is seems like the only identity sources that allow any kind of filtering are AD Query and Identity Collector.
Then again, I guess I just need to prevent the Identity Agent from being able to reach the gateway in the first place.
I'll just try this before getting involved with TAC.