Hi, I did a few more tests. Apparently, this cookie issue - happens in proxy mode - does not happen in CGI mode Of course, it is required to delete all cookies stored in the browser once the __ac cookie has been successfully set in CGI mode I have enclose an excerpt of my Apache config which shows various tests. JPS. <VirtualHost erp5.org> DocumentRoot /home/jp/public_html/erp5/ ServerName erp5.org ServerAlias www.erp5.org #ProxyPass / http://localhost:9673/VirtualHostBase/http/www.erp5.org:80/erp5/VirtualHostR... RewriteEngine on RewriteCond %{HTTP:Authorization} ^(.*) #RewriteRule ^/(.*) http://localhost:9673/VirtualHostBase/http/www.erp5.org:80/erp5/VirtualHostR... [L,P] #RewriteRule ^/(.*) http://localhost:9673/erp5/$1 [L,P] #RewriteRule ^/(.*) http://localhost:9673/VirtualHostBase/http/www.erp5.org:80/erp5/VirtualHostR... [L,P] RewriteRule ^/(.*) /usr/lib/cgi-bin/Zope/VirtualHostBase/http/www.erp5.org:80/erp5/VirtualHostRoot/$1 [e=HTTP_CGI_AUTHORIZATION:%1,t=application/x-httpd-cgi,l] </VirtualHost> -- Jean-Paul Smets-Solanes <jp@nexedi.com> - Nexedi (CEO) GPG Fingerprint: 40FF FA78 75AA 680D 8BB4 EEF9 539A 79CC CB8E 5F01