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Error 11205

Error - 11205

HTTP connection failure

There was a network failure attempting to connect to this URL. Twilio will try for 10 seconds to establish a TCP connection to your URL (two 5 second attempts). Twilio will wait for a total of 15 seconds to receive an HTTP response, this includes the TCP connection time, so if it took six seconds to establish a TCP connection, your server would have 9 seconds to deliver an HTTP response. If either of those timers expire we fail the request, fire a notification, and try your Fallback URL, if one is specified.

Possible Causes

  • network outages between Twilio and your web server
  • URLs that reference private IP addresses or localhost
  • Twilio's TCP timeout is 10 seconds; so if you see an error in Request Inspector after > 10000 milliseconds Twilio could locate your server, but could not establish a TCP connection with it.
  • Twilio's HTTP timeout is 15 seconds; if you see an error in Request Inspector returned after > 15000 milliseconds, Twilio was able to establish a TCP connection with your server, but the HTTP response from the server failed.

Possible Solutions

  • verify the URL provided is accessible to the public internet
  • verify network connectivity to your web server
  • check your TCP logs to verify inbound connection attempts are successful
  • check HTTP server logs to verify a response was generated and returned within the timeout
  • check your edge element logs to verify responses are making it out of your infrastructure
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