Unable to upload files via Seafile interface on a Plesk server

Symptoms

• File upload via Seafile interface fails with:

  PLESK_INFO: Unknown error

• When opening Seafile storage in Plesk Premium Email, one of the following error messages appear:

  PLESK_INFO: Authentication failed for seafile storage

  ---

  PLESK_INFO: User credentials not provided

• The following error is displayed in the Plesk Premium Email > example.com > Troubleshooting:

  PLESK_WARN: Preferred domain redirects are not supported and will break various features.

  

Cause

This is a Seafile limitation, the extension 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 Kolab extension will warn about this limitation.

Resolution

Set Preferred domain to None in Plesk at Domains > example.com > Hosting Settings