STA is being marked down and I have no clue why.... Access via Storefront works without any issue. We switched to HTTP for debugging.

Have you load balanced the STAs?

nope I degraded it to a single STA for debugging purpose. Seems to be a routing issue, I see that the NSIP is communicating with the STA insteat of the SNIP. strange setup, but I'm closer

You've probably solved it by now but you could bind a net profile to a service to force it to use a specific SNIP.

Solved it 😉 It was a missing route. The idea is cool - wasn't aware of it. thank you!