Hi,
This is our nginx configuration setup.

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http {
include mime.types;

gzip on;
gzip_http_version 1.1;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain application/xml text/css application/x-javascript text/xml application/javascript text/javascript;
gzip_disable "MSIE [1-6]\.";

autoindex off;
ssi off;
server_tokens off;

log_format main '$remote_addr [$time_local] - "$request" - '
'$status - $body_bytes_sent - "$http_referer"';

log_format lb_log '$remote_addr [$time_local] - "$request" - $status - '
'worker_addr $upstream_addr - '
'worker_status $upstream_status - '
'worker_response_time $upstream_response_time - '
'total_processing_time $request_time - '
'content_type $upstream_http_content_type';

log_format doc_log '$remote_addr [$time_local] - "$request" - $status - '
'worker_addr $upstream_addr - '
'worker_status $upstream_status - '
'worker_response_time $upstream_response_time - '
'total_processing_time $request_time - '
'content_type $upstream_http_content_type';


access_log logs/access.log main;
error_log logs/error.log;

sendfile on;
keepalive_timeout 60;

proxy_ssl_session_reuse on;

upstream loadbalancer {
server server1-ip:443 weight=1 max_fails=5 fail_timeout=3m;
server server2-ip:443 weight=1 max_fails=5 fail_timeout=3m;
}
upstream docproxy {
server 127.0.0.1:7443;
}

server {
listen 443 ssl;
server_name lb.abcd.net;

location ~ ^/documents/(.*)(jpg|jpeg|gif|png|txt|pdf|html|htm){
root /home;
access_log logs/doc_access.log doc_log;
}

location ~* ^.+.(jpg|jpeg|gif|png|ico|css|txt|js)$ {
expires 24h;
add_header Cache-Control public;
root media;
}

ssl_certificate /root/Apache_New_SSL_Keys/lendingstream.co.uk.crt;
ssl_certificate_key /root/Apache_New_SSL_Keys/lendingstream.key.nopass;
ssl_session_timeout 3m;
ssl_protocols SSLv3;
ssl_ciphers HIGH:!aNULL:!MD5;
ssl_prefer_server_ciphers on;

proxy_redirect / /;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_read_timeout 360s;

location ~ ^/documents/ {
proxy_pass https://docproxy;
access_log logs/doc_access.log doc_log;
}
location / {
proxy_pass https://loadbalancer;
access_log logs/lb_access.log lb_log;
}

error_page 403 /403.html;
error_page 404 /404.html;
error_page 500 502 503 504 /500.html;

location ~ ^/(403.html|404.html|500.html)$ {
root html;
}
}
}

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Here, we will forward all the requests except documents to LB, which in turn send to either server1 or server2. The document related requests will be proxy forwarded to apache running in the same machine at 7443 port. But, here comes the problem that when it is sending any request to apache it is giving 500 error. In apache logs, it's been logged as [error] Hello. The apache configurations are:

httpd.conf is,
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ServerRoot "/usr/local/apache2"
PidFile logs/httpd.pid
Listen 80
ServerTokens ProductOnly
ServerSignature Off

###### Loaded all modules which are required
LoadModule *****.so
###### Loaded all modules which are required

<IfModule !mpm_netware_module>
<IfModule !mpm_winnt_module>
User USER
Group GROUP
</IfModule>
</IfModule>

DocumentRoot "/usr/local/apache2/htdocs"

<Directory />
Options -Indexes +FollowSymLinks
AllowOverride None
Order deny,allow
Deny from all
</Directory>

<Directory "/usr/local/apache2/htdocs">
Options -Indexes +FollowSymLinks
AllowOverride None
Order allow,deny
Allow from all
</Directory>

ErrorLog "logs/error_log"
LogLevel notice

<IfModule ssl_module>
SSLRandomSeed startup builtin
SSLRandomSeed connect builtin
</IfModule>

<VirtualHost *:80>
Alias /documents /home/documents
<Directory /home/documents>
Order deny,allow
Allow from all
</Directory>

WSGIScriptAlias / apache/django.wsgi
<Directory "apache">
Order allow,deny
Allow from all
</Directory>
</VirtualHost>


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and the httpd-ssl.conf is,
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LoadModule ssl_module modules/mod_ssl.so
LoadModule wsgi_module modules/mod_wsgi.so

Listen 7443
AddType application/x-x509-ca-cert .crt
AddType application/x-pkcs7-crl .crl

SSLPassPhraseDialog builtin

SSLSessionCache "shmcb:/usr/local/apache2/logs/ssl_scache(512000)"
SSLSessionCacheTimeout 15
SSLMutex "file:/usr/local/apache2/logs/ssl_mutex"


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Please help me in resolving this as this is very crucial and urgent for us. Thanks for replying....