Persistent SSL “bad record mac” error when connecting to ComfyUI API (in container setup)

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I’ve been encountering a persistent SSL error when trying to connect to the ComfyUI API. Despite multiple fixes and configuration attempts, the issue still occurs consistently.

Error Message

ComfyUI API Error: A0C3C08CFFFF0000:error:0A0003FC:SSL routines:ssl3_read_bytes:sslv3 alert bad record mac:../deps/openssl/openssl/ssl/record/rec_layer_s3.c:1605:SSL alert number 20

Environment Details

  • Deployment type: Docker container (ComfyUI + external client)

  • Base image: (e.g., comfyui/comfyui:latest or your custom image)

  • Python version: (Python 3)

  • OS / Host platform: (Docker Desktop on macOS)

  • Network setup: API client connects to ComfyUI running inside a container via exposed port (e.g., 0.0.0.0:8188)

What I’ve Tried

  • Regenerated SSL certificates for both client and ComfyUI

  • Disabled and re-enabled SSL verification

  • Tried both HTTP and HTTPS endpoints

  • Tested different OpenSSL versions

  • Rebuilt Docker containers with clean volumes

  • Used --listen 0.0.0.0 --port 8188 when starting ComfyUI

Expected Behavior

The ComfyUI API should accept requests without SSL negotiation errors.

Actual Behavior

The API throws the sslv3 alert bad record mac error whenever a request is made — even though the API endpoint is reachable and accessible.

Additional Context

If this is related to specific TLS versions or SSL cipher mismatches between the containerized ComfyUI server and the API client, any insight into recommended configuration or flags would be appreciated.