Dear support team, I am trying to use single signon in firefox, which I do as follows: via about:config I change the 2 following parameters as follows: firefox network.negotiate-auth.delegation-uris = site1, site2 firefox network.negotiate-auth.trusted-uris = site1, site2 Next I restart browser to activate changes. 1) site1 single signon works ok 2) site2 works ok 3) If I try site1 again, single signon does not work anymore, I have to restart the browser for sso to work again. It would be nice to be able to have both sites working, without having to restart the browser. Unfortunately my sites are on a corporate intranet, so I cannot easily provide a test url for you. Let me know if I can provide additional info. Rgds, Eirikur.