An invalid response was received from the upstream server

[omerkarabacak]

Summary

We have problem while running Kong in our Docker Swarm cluster. We have one upstream, one upstream target and one api.

After a while, when we send a request to kong api endpoint we get this response from "An invalid response was received from the upstream server"

This generally happens at first request.

Additional Details & Logs

• Kong version 0.12.1
• Kong error logs

2018/03/19 08:39:11 [error] 49#0: *18910 recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 10.255.0.2, server: kong, request: "POST /one-time-password-service/v2/password HTTP/1.1", upstream: "http://x.x.x.x:y/v2/password", host: "a.b.c:8090"

• Operating System
  CoreOS 1688.3.0 (Beta Channel)
  docker version
  Server:
  Engine:
  Version: 17.12.1-ce
  API version: 1.35 (minimum version 1.12)
  Go version: go1.9.4
  Git commit: 7390fc6
  Built: Tue Feb 27 22:10:31 2018
  OS/Arch: linux/amd64
  Experimental: true

[thibaultcha]

Hi,

There is little we can do to help you here, this is an issue between Nginx and your upstream server that is behaving wrongly. See this topic to help you debug the issue. Thanks

[mgiangrandi]

Hi, any news about this issue? Same problem here...

[wmrodrigues]

Same problem as well, anyone had any progress?

[thibaultcha]

@mgiangrandi @wmrodrigues As explained in the topic I linked to in my previous comment, this is not a problem with Kong, but likely a misconfiguration of the upstream server. The topic has a list of steps to follow to help you troubleshoot the issue.

[wmrodrigues]

I'm reading the topic right now, thanks for the tips @thibaultcha

[jerneyio]

I'd like to add that I was receiving this message today because of a misconfiguration of a service on the Kong side (my error). My service was as follows (notice the incorrect HTTP port):

{
  "host": "host.com",
  "created_at": 1536606408,
  "connect_timeout": 60000,
  "id": "a53cef5b-46f5-4fc4-b70c-6d20a2fbcd76",
  "protocol": "http",
  "name": "mock-service",
  "read_timeout": 60000,
  "port": 443,
  "path": "/api",
  "updated_at": 1536697486,
  "retries": 5,
  "write_timeout": 60000
}

When I switched the port to 80, things started working correctly again.

[inallib]

take a look at here