Skip to content Skip to navigation Skip to topbar

Twilio Docs

Error and Warning Dictionary Debugging Your Twilio Application Alarms

Messaging
Voice
Video
Serverless
Flex
Studio
All docs...

SDKs
Help

Log in
Sign up

On this page

ERROR: 51221

51221: Twilsock : Upstream Request Timeout

ERROR: 51221

ERROR

Request timed out

Need some help?

We all do sometimes; code is hard. Get help now from our support team, or lean on the wisdom of the crowd by browsing the Twilio tag on Stack Overflow.

Terms of service

Copyright © 2025 Twilio Inc.