MCP OAth links

Questions
1

Describe the problem/error/question

I am trying to use the MCP Oath in Claude to connect n8n. I have community version with Cloudflare Tunnel, I also have security turn on to allow only email address from our company get pass cloudflare to get to sign in screen.

I have made rules exepetion for mcp and webhooks, which work with other appliactions just fine. It only Claude.ai trying to connect to MCP via Oath that is blocked. What are the extension ending when initiating this?

What is the error message (if any)? OAth is not connecting

Please share your workflow

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)

Share the output returned by the last node

Information on your n8n setup

  • n8n version: 1.12
  • Database (default: SQLite): PostGre
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app): docker via hostinger
  • Operating system: MACOS
2

This issue is likely related to Cloudflare’s security settings blocking the OAuth callback from Claude.ai. When initiating OAuth, the callback URL typically ends with `/oauth/callback`. Check your Cloudflare firewall rules to ensure this endpoint is whitelisted for Claude.ai’s IP range. You might also want to temporarily disable Cloudflare’s security features to test if that resolves the connection issue. If that works, you can then adjust your rules accordingly.