Skip to main content
If Zapier MCP tools start returning 404 errors after working previously, the connection token stored by your AI client has likely expired. This issue only affects AI clients that store a connection token in their configuration.

​
Symptom

Your MCP tools stop working and return 404 (not found) errors when your AI client tries to use them.

​
Causes

The connection token stored in your AI client’s configuration is no longer valid. The token can become invalid over time, particularly after long periods of inactivity or after a security event. Once the token is invalid, the saved server URL can no longer authenticate tool calls.

​
How to fix it

Generate a new connection token and replace the saved one in your AI client:
1

Open your server

Go to the Zapier MCP dashboard and select your server.
2

Go to the Connect tab

Select the Connect tab.
3

Rotate your token

Select Rotate token to generate a new connection token.
4

Update your client

Update the server URL in your AI client’s configuration.
5

Restart

Restart your AI client.
Your connection token is like a password. Do not share it, as anyone with the token can run your actions and access your data. If you believe your token has been exposed, rotate it immediately.

​
Still need help?