stop process if launch fails

[vincentullmann]

Is there an existing issue for this?

• I have searched the existing issues and added correct labels.

Description

Current Behavior

If something goes wrong while launching ComfyUI (bug, port in use, bad config (?) ) the webserver process keeps running in the background

Expected Behavior

The process should stop and any error messages should be shown to the user

Steps To Reproduce:

1. launch another process that occupies ports 5454 and 55056

2. make sure ayon-comfy is configured to use those ports

3. attempt to launch comfy ui

4. the initial "select launch profile window" shows up but the comfyui never launches

5. open the process monitor:

full log (warning: its a gets very repetitive after a while)
ayon_comfyui_output_d0cl76bk (1).txt

Peek.2026-06-02.11-57.mp4

Additional context:

Version

Version of the server, ayon-core and the addon that's affected

What platform were you running when you found the bug?

Arch Linux

You can also provide any additional information relevant to the issue.

Relevant log output: