Hello,

Out Config-File is:

server {
listen xxx.xxx.xxx.xxx:80;
server_name domain.foobar.org;
access_log
/var/www/html/domain.foobar.org/logs/nginx_domain.foobar.org_access.log
main;

location / {
proxy_pass
http://xxx.xxx.xxx.xxx:8080;
proxy_redirect off;

proxy_set_header Host $host;
proxy_set_header X-Real-IP
$remote_addr;
proxy_set_header X-Forwarded-For
$proxy_add_x_forwarded_for;
proxy_set_header Referer
$http_referer;
proxy_set_header Accept-Language
$http_accept_language;

client_max_body_size 64m;
client_body_buffer_size 128k;

proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;

proxy_buffer_size 4k;
proxy_buffers 4 32k;
proxy_busy_buffers_size 64k;
proxy_temp_file_write_size 64k;

proxy_cache STATIC;
proxy_cache_valid 200 30m;
proxy_cache_valid any 1m;
proxy_cache_use_stale error timeout
invalid_header updating http_500 http_502 http_503 http_504;
}
}

As you can see, we have already set the parameter proxy_set_header. The
problem occurs randomly, not all the time. When the problem occurs, we
got the apache server startpage with the servers hostname.

Maxim Dounin wrote in post #1040185:
> Hello!
>
> On Tue, Jan 10, 2012 at 09:42:45AM +0100, Maik Unger wrote:
>
>> Hy,
>>
>> We have that problem, that a site is not reachable throught nginx with
>> the domain name (for example www.foobar.org), even the websites are
>> reachable without nginx directly to apache.
>>
>> This problem is not time specific, so that we have no solution at this
>> moment.
>>
>> What is the problem here?
>
> Most likely you are using wrong config.
>
> By default nginx will use hostname as specified in proxy_pass
> directive, i.e.
>
> proxy_pass http://127.0.0.1:8080;
>
> will generate request with Host header set to "127.0.0.1:8080",
> not to "www.foobar.org". Your backend server won't recognize it
> if it's configured to serve many virtual hosts, and
> "www.foobar.org" is just one of them.
>
> To preserve the hostname from the original request (as sent to
> nginx server), use
>
> proxy_pass http://127.0.0.1:8080;
> proxy_set_header Host $host;
>
> Maxim Dounin

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