Not allowed files when trying to sync to IIS Webdav

[Tony]

Hi @tim.adams,
The current items in not allowed appear to be illegal character issues with OneDrive for Business, which has really strict rules on allowed characters. In this case it looks to be the “%” character.

More on their restrictions here: Restrictions and limitations in OneDrive and SharePoint - Microsoft Support

For WebDAV, the server is throwing an exception, but it is generic. Can you tell me the name of the file(s) that are not able to sync? There may be an issue with mime typing or special characters that needs to be adjusted on the WebDAV server side. More on that here:

How do I setup a WebDAV Server on Windows and link it to odrive?

MIME Types By default IIS will block serving content for MIME types that are unknown (flac and mkv, for example). You can add additional MIME Types (and remove others), if you wish to adjust what is supported. It is best practice to create an entry for each additional type you want to add. If you find yourself in a pinch, however, you can add a wildcard mapping until you can sort out the proper individual entries. Click on “MIME Types” under “Default Web Site” [image] Click on “Add” [image] …

How do I setup a WebDAV Server on Windows and link it to odrive?

Special Characters The default settings should allow all characters that Windows allows, except the “+” character. There is a setting to try to deal with that. Click on “Request Filtering” under “Default Web Site”, select “Edit Feature Settings” [image] Check “Allow double escaping” [image]

You should be able to find the WebDAV logfiles in C:\inetpub\logs\LogFiles\W3SVC1. These may give us some better info on what is happening too.