I couldn't get the zimbra proxy servers to work with https over the backend, though I tried a number of different combinations found here:
Enabling Zimbra Proxy - Zimbra :: Wiki
(I subbed in zmproxyconfig instead of zmproxyinit, since I'm on 6.)
However, that page did offer me the answer to the problem:
Quote:
zmprov mcf zimbraPublicServiceHostname mail.domain.com
zmprov md domaina.com zimbraPublicServiceProtocol https
zmprov md domaina.com zimbraPublicServicePort 443
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solved the problem I was experiencing. Thanks for your help - searching around for Zimbra proxy config settings to try to get them to talk over 8443 instead of 8080 is what eventually lead me to that page.