@Tom Browder: it seems to be a Symfony and SSO issue. Our developers team is facing issues when accessing simultaneously to different applications hosted on the server (in different tabs in the same browser). Symfony is basing SSO authentication on the domain name and URLs such as mydomain.fr/application1 and mydomain.fr/application2 are interpreted as being from the same domain (contrarily to URLs such as application1.mydomain.fr and application2.mydomain.fr). I do not know Symfony and I can't give you any more details on their problematic.Hope it helps you to understand the need,