WEbDav http error 503 using Zotero on Windows 10 and nextcloud

Hi,

I have multiple instances of Zotero installed on several PCs and Macs, using nextcloud as my webdav server for attachments.

They all work nicely except for the windows 10 PC where I keep getting a http 503 error when trying to sync the attachments.

The webdav configuration is identical everywhere, and and the webdav account verification works perfectly. This is driving me nuts. Any suggestions?

Thanks
Hart
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