Hey shehhe, networking is definitely not my strong suit, but I believe people have gotten llama.cpp to work before. When the test connection button is disabled, what is the message at the bottom right, above save changes?
Two things that could be going wrong are: 1. you may not be using the chat completions endpoint or 2. you haven't selected a model ID. The llama.cpp endpoint should end in /v1/chat/completions. If you have the right endpoint, clicking on the model selection box should show some models.
