Skip to main content

Get Support
Have a question? Let's get you an answer!

How Do I...? Troubleshooting Code & Webhooks Developer Zone

Other Help Resources
Wait, there's more! Check out these Community sourced spaces for additional resources.

Zapier Help Center Hire an Expert

Learning Resources
All of our best learning resources can be found here.

Featured Articles Show & Tell Zapier's products AI Hub Zapier Tools Hub

Share your knowledge
Give back to the Community by sharing your automation wins and helping to answer questions.

Share your success See unanswered questions User Groups

Other Learning Resources
Some of our favorite additional ways to upskill your Zapier knowledge.

Zapier Learn Zapier Blog Zapier Webinars

Product Updates
Check out what is new and upcoming with Zapier with our regular product updates.

Product Updates

Early Access Program
Want to join Early Access? Learn more here.

Question

Issue while connecting with Zapier

  • November 26, 2025
  • 1 reply
  • 25 views
V

I tried to use Zapier webhook(gmail connected) to send a mail as usual but to day i encountered a new error saying “Invalid proxy server token passed” where i thought the problem was on my side(my code) and then tried it on Cursor AI by connecting the server config from zapier then encountered the same error where the agent is returning this response from zapier:
{
  "error": "Authentication Error, Invalid proxy server token passed. Received API Key = sk-...OiKQ, Key Hash (Token) =XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX. Unable to find token in cache or `LiteLLM_VerificationTokenTable`"
}
The agents on Cursor AI are also encountering error to execute a  gmail_send_email tool

For reference i have also uploaded the screenshot of the error on Cursor AI and Zapier history
How to solve this issue?
Is this problem associated with the Cursor agents or Zapier! 

d00a206f4535317b469a96450fe0ffd4.png
58861ef5f8a6430dd3c62faaf3235859.png

This post has been edited by a moderator to remove sensitive information. Please remember that this is a public forum and avoid sharing credentials, tokens, or other private details that could compromise your account security.

1 reply

P
Forum|alt.badge.img+1
  • PavelZZapier Staff
  • Zapier Staff
  • November 27, 2025

Hi ​@Vishnu K 

I’m Pavel from Zapier Support.

This error is coming from Zapier’s side — even when triggered from tools like Cursor, the request still runs through Zapier’s backend. In this case, the internal token Zapier uses to authorize the action isn’t being recognized, which is why you’re seeing the “invalid proxy token” message.

I recommend reaching out to our support team directly via the contact form here: https://zapier.com/app/get-help

This will allow us to route your request to the appropriate team, who can investigate the issue in more depth.

Thank you.

Pavel Z
Terms & ConditionsAccessibility statement