Hi, I had solved with the option zimbraPublicServiceProtocol that comes disabled configured to https.
now my problem continue with something similar to your problem:
In the other way, I had changed the option Public Server Name, but now in the
briefcase the links had change both (public and private). I mean:
my private server url is
https://mail.foo.bar
my public server url is
https://webmail.foo.bar
So If I am inside the company y write
https://mail.foo.bar and the links of the
documents of briefcase are
https://webmail.foo.bar..........
Thats is a new bug? regards