We don't use ssl connection, and connect through 80 port using apache. In 6th version everything worked well, but after upgrading it to 7th following error sometimes appear. XmlHttpRequestError Proxy Error

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request POST /web/dataset/call_kw.

Reason: Error reading from remote server

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Apache/2.2.22 (Ubuntu) Server at mydomain.com Port 80

apache config: # DocumentRoot "/home/monoserp/openerp-server/openerp" ServerName mydomain.com ServerAdmin aldar@gmail.com # DirectoryIndex index.html index.php ProxyRequests On ProxyPreserveHost On ProxyVia full ProxyTimeout 18000 Options FollowSymLinks AllowOverride None Order allow,deny allow from all Order deny,allow Allow from all SetEnv proxy-nokeepalive 1 ProxyPass / 127.0.0.1:8069/ connectiontimeout=500 timeout=18000 ProxyPassReverse / 127.0.0.1:8069/