Istio-proxy giving error "connection in use"

Networking
1

During my practice exam for Istio, in one of the questions, there were two issues. One was related to sidecar injection and another was due to connection error for istio-proxy. I was able to fix sidecar injection as hostNetwork was set to true in deployment which was causing it. But other error, I couldn’t fix. Can someone help me with it?

[2017-01-29 15:08:02 +0000] [19640] [INFO] Starting gunicorn 19.4.5
[2017-01-29 15:08:02 +0000] [19640] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2017-01-29 15:08:02 +0000] [19640] [ERROR] Retrying in 1 second.
[2017-01-29 15:08:03 +0000] [19640] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2017-01-29 15:08:03 +0000] [19640] [ERROR] Retrying in 1 second.
[2017-01-29 15:08:04 +0000] [19640] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2017-01-29 15:08:04 +0000] [19640] [ERROR] Retrying in 1 second.
[2017-01-29 15:08:05 +0000] [19640] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2017-01-29 15:08:05 +0000] [19640] [ERROR] Retrying in 1 second.
[2017-01-29 15:08:06 +0000] [19640] [ERROR] Connection in use: ('0.0.0.0', 8000)
[2017-01-29 15:08:06 +0000] [19640] [ERROR] Retrying in 1 second.
[2017-01-29 15:08:07 +0000] [19640] [ERROR] Can't connect to ('0.0.0.0', 8000)
2

actually, it is a security issue. httpbin was running with “securityContext: runAsUser: 1000” and after removing it everything works.