Debugging another issue

Server NGINX
1

Im receiveing lots of messages like “error] 32211#0: *1650258 upstream
sent
no valid HTTP/1.0 header while reading response header from upstream,
client: 178.66.174.159, server: , request: “POST /_serv/chat/read
HTTP/1.1”,
upstream: “http://212.117.183.43:80/_serv/chat/read”, host: "
thewarezscene.org”, referrer: “thewarezscene.org”"

Its getting on my nerves because I can never reproduce it. This error
only
appears on the Nginx(2) node and not Nginx(1) Node. The setup is as
follows

Nginx(2)[NL Datacenter] → Nginx(1)[Offsite] → Mono[Same location as
Nginx(1)]

Any ideas, a timeout or connection error?

2

Another snippet of info, here is the raw response returned to the client

HTTP/1.0 200 OK
Server: TWS.NET/1.1
Date: Mon, 01 Nov 2010 03:27:26 GMT