When I first implemented Zimbra everything was working fine. I started with the users that are located inside the office. Then I started switching the people outside the office. Everone internal can access Zimbra fine. Some of the people outside are having problems. When they bring up zimbra it gives them a login screen and when they enter their username and password they get a blank screen. I've tried telling to wait it out but the times get inaccess of 10 minutes and still nothing. Some people don't even get the login screen. It really confusing because I make sure they are not running any extra firewalls or anything like that. I've found that their can be a problem if they are running Norton Internet Security. It's also confusing for the ones with XP SP2 with IE SP2. I've also tried the gzip=false method still nothing. Also doesn't work with firefox. Any suggestions.