Bitcoin App Proxy stuck always `Starting...`

Strange one.

Bitcoind container is up and running, so is bitcoin_app_proxy on port 2100.

Screenshot

Blockchain is fully synced, mempool explorer works.

However cannot get a response from the Bitcoin app proxy on umbrel.local:2100 , which results in dashboard constantly showing the App as Starting...

Screenshot
image

Log for the app proxy shows:
Error wating for port: "connect EHOSTUNREACH 10.21.22.2:3005" Retrying...

Any ideas?

I have the same situation. I hope somebody answer.