DeadlineExceededError: Deadline exceeded while waiting for HTTP response from URL

[gulshanb098]

https://i.stack.imgur.com/oRglO.png

Description
The same configuration is working fine in cloud (using IP of cloud server). But, it is not working in any local ubuntu local setup (local server IP). Different scenarios I got in local server.

• Call is getting started and working fine (2 out of 10 times).
• Call is getting started, but auto disconnect after some seconds (2 out of 10 times).
• Once receive the call, it's showing 'connecting' (6 out of 10 times).

I tried to update the deadline time in apprtc.py (apprtc/src/app_engine/apprtc.py), but it is not working.
urlfetch.set_default_fetch_deadline(45)

Steps to reproduce
used the APPRTC endpoints at android to create calls.
Setup the APPRTC server with collider and coturn at ubuntu local system.

Expected results
Call drops should be eliminated.