Manta 4p CB1 shows in network app but won't open in browser

Manta 4p CB1 shows in network app but won't open in browser.
I had this working and set up config/macros. I had tuned things and machine printing but after a few days won't show in browser.
Things tried:
Re-imaged a couple times.
Double, triple checked IP, ps and user name are correct or wouldn't show in network app.
Again, shows IP in Network app but won't open in browser.

I have other Klipper instances running in browser so it shouldn't be blocked.

The issue names no files, tests, or entry points. Begin by reproducing the reported difference between Network app visibility and browser access, then identify a concrete failing component and verification condition; the issue currently does not define what done looks like.

Written by the indexing model from the issue text.