Using the latest Zimbra, downloaded a couple of days ago. Also Centos 5.4.

Zimbra web client (AJax/html), the internal access, works perfectly fine, no problems.

I then setup external access, open up port 80, but here the difference is I forward that port to our ISA server rather direct to Zimbra as we have many internal servers.

Also I have set up Isa server to access the server from a subdirectory subdomain.domain.co.UK/zimbra.

The web interface seems to initially load okay when you try and log on the splash screen is shown but it just hangs. the HTML version loads fine, it is only the Ajax version that hangs. Remember that the Ajax version does actually work on the internal network but not externally. Do I
have to open extra ports other than just port 80 and is ISA server 2006 causing a problem?

I am not a particularly advanced user of ISA server 2006 either, which does not help!

thanks in advance,