Well, my configuration is a web server with https enabled and the mailboxes stored into him. Really, when i access thru the internet, i am apache reverse-proxied, but into the lan, and skipping that apache jump, i get the same double-loging annoying issue. Do you think SSO is the key? i'm exploring its posibilities, but that second screen i get is from the java console, not the IE/Firefox..., so i'm not sure if it is gonna be the solution. Maybe yes. I'll review my configuration and tell what i get.
Thanks a lot!