i installed zimbra 6.0.5, hostname server1.domain.xx
i installed apache 2, hostname redirect.mail.domain.xx

i use this how-to
Zimbra with Apache using mod jk - mod proxy - mod proxy ajp - Zimbra :: Wiki
# 4 Using an HTTP proxy

So, i try write redirect.mail.domain.xx to firefox and IE. I get login screen and
when i log in i get this message:
Oops! It appears your browser does not allow cookies. You need to enable cookies in order to use the Zimbra Collaboration Suite.

URL in browser is: redirect.mail.domain.xx

When I try write original URL server1.domain.xx I log in OK.

Sorry for english

thx for reply