I’ve got an MCP server hosted in Cloudflare that only supports CIMD and not DCR. It works fine in Claude. Trying to connect to it from ChatGPT, we get a 403 when reaching out to the CIMD client metadata URL. I can reach it fine locally, so it seems like it might be some kind of WAF or bot prevention blocking my Cloudflare worker from reaching it. This is the message I get in my logs when it fails:
“CIMD fetch failed for https ://chatgpt.com/oauth/snip/client.json:”
“Failed to fetch client metadata: HTTP 403”