[[!comment format=mdwn
 username="https://www.google.com/accounts/o8/id?id=AItOawmZilYULa6CDEGfuagoDlesyakBgnf-dF8"
 nickname="Maarten"
 subject="Box.com and unknown CA?"
 date="2014-05-21T04:07:36Z"
 content="""
When trying to enable box.com for jabber sharing, I get:

    WebDAV failed to write file: TlsException (HandshakeFailed (Error_Protocol (\"certificate has unknown CA\",True,UnknownCa))): user error

How can I debug this situation?
"""]]
