nginx forward proxy - 502 bad gateway

mex nginx-forum at
Sat Mar 9 18:29:01 UTC 2013

> This server is behind a cisco firewall with port 8080 open. Where is
> the
> problem?
> The line:
> proxy_pass http://$http_host$uri$is_args$args;
> has problem with firewalls? or it is something else?

are you able to connect to $http_host from that second server,
maybe via lynx/w3m?
$ telnet $http_host 8080 

and then 

GET / 

additionally, can you execute the following on that
server to check if you're able to connect to your resolver:

$ nslookup $http_host

Posted at Nginx Forum:,237162,237164#msg-237164

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