UEFN 42.10 keeps resetting bAutoStartServer=False every time it launches. Also Something about how UEFN 42.10 registers the HTTP route handler is broken even with the right settings.
Yep. I can’t get MCP to work after the update. Had no issues before the update.
Hello Everyone
I can confirm the same issue after UEFN 42.10.
MCP was working normally for me before the update with Claude Code.
After 42.10, the MCP client reports ConnectionRefused.
I verified the UEFN Model Context Protocol settings:
- Server URL Path:
/mcp - Server Port Number:
8000 - Enable Tool Search: enabled
However, while UEFN is running:
netstat -ano | findstr :8000
returns no result at all.
Before the update, the same command showed 127.0.0.1:8000 in LISTENING state owned by UnrealEditorFortnite-Win64.exe.
I also tested this on two separate UEFN projects where MCP previously worked, including a clean test/duplicate project. Neither project starts listening on port 8000 after the update.
Restarting UEFN does not fix it.
This appears to happen before the MCP client is involved — the UEFN MCP HTTP server itself does not seem to start.
I can provide screenshots of the MCP settings and netstat result if useful.
Hi @jhardy,
Could you please re-create this thread under the issues and bug reporting category
That way we can get this into our internal bug system and triage from there