Cannot find WebDAV server

I'm using a private webDAV server, and as yet we don't have SSL on it. Using the http:// option (webDAV) - ie not secure - the verify server is failing, and not finding the server.
Upon following the output debug procedure, it appears that in the background, the relevant output is:

zotero(3): Verifying storage

zotero(3): HTTP OPTIONS for https://username:********@dav.servername.co.uk/zotero/

zotero(3): ===>0<===(number)

with changes made to protect details...

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