I changed the proxy timeout in the http.conf to 120 and now the connection is stable :
<Proxy http://localhost:7070/http-bind>
Order allow,deny
Allow from all
</Proxy>
ProxyPass /http-bind http://localhost:7070/http-bind/ timeout=120
ProxyPassReverse /http-bind http://localhost:7070/http-bind/ timeout=120
I guess that the timeout period shall be greater on the Proxy than on Openfire, but I couldn't find the timeout parameter(s) for /http-bind on openfire (http://community.igniterealtime.org/docs/DOC-1061). What are the timeout parameter(s) and what are the default values?