1.5b2 fails to verify sync() server, returns '-6'?

Hi,

Installed 1.5b2 in fully patched Mozilla Firefox 3.0.8 on latest
Ubuntu (jaunty). Everything seems to work except sync().
I created an (I believe) DAP-accessible world-readable directory at

https://webfiles.uci.edu/zender/zotero

Zotero always fails to verify this server, returning only the
mysterious error message '-6' in a firefox Error window.
What does the error code '-6' mean?

zotero is already useful to me (longtime LaTeX/BibTeX user)
without, and would be indispensable to me with, this sync()
functionality.

Any suggestions appreciated.

Thanks,
Charlie

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