Symptoms
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File upload via Seafile interface fails with:
Unknown error
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When opening Seafile storage in the Plesk Premium Email webmail, one of the following error messages appear:
Authentication failed for seafile storage
User credentials not provided
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The following error is displayed in the menu Plesk Premium Email > example.com > Troubleshooting:
Preferred domain redirects are not supported and will break various features.
Cause
This is a Seafile limitation - it may not work correctly when the website is using www redirection (configured in Plesk at Domains > example.com > Hosting Settings).
It will be resolved on future Seafile updates.
The next version of the Plesk Premium Email extension will warn about this limitation.
Resolution
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Go to Domains > example.com > Hosting & DNS > Hosting Settings.
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Set the Preferred domain to None and click OK or Apply at the bottom of the page to apply the change.