i am running zimbra OSS 7 on Ubuntu 10.04 x86_64.
In front of it i am running a debian box, which is acting as IPv6 gateway, mailrelay and Apache Reverseproxy.

this worked fine from the beginning with zimbra 6 ob ubuntu 10.

last week i upgraded to Zimbra 7.2.0 now two problems arrised:

1. i cant login with MacOS X 10.6 (neither Safari nor Firefox) if the Mac is also dualstacked with IPv6

2. i cant connect to Zimbra if the client connects with a SquidProxy to the internet.

after providing the credentials it tries to login forever.
If switching to standard HTML the mailbox opens, but has some missing pictures.
But there are no errors in the error.log of apache.

what changed with Zimbra 7.2.0?

best regards