Debugging another issue

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

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

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

Any ideas, a timeout or connection error?

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

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