My work is switching over its collaboration suite to Zimbra & I'm having difficulty getting gpe-calendar to sync with it.

I've had no problem with Thunderbird & Lightning with Zimbra:
http://wiki.zimbra.com/index.php?tit..._%26_Lightning

With gpe-calendar, I've tried:
Tools->Calendars New Type->Subscribe
and entered the URL & login that works for Lightning.

However, when I go to sync/download, I get:
"Calendar Syncronization
https://companyserver.com/me/Calendar: 6 SSL handshake failed"

Using http or https makes no difference (both work for Lightning)

I realize that this is a very specific case, but given the error message, anything I could check?

Fwiw, I get the same message when using ssl webdav with lighttpd as server.

For what it's worth, I have the same problem with Horde and it's calendar. Although, this is obviously an issue with the GPE Calendar.

Best,

J.