Client cant sync with Https / IIS rewrite

I am running Seafile server on Windows with Maria DB. I set up IIS to do a rewrite / redirect so I can us HTTPS with a CA certificate. I followed a tutorial I found on the youtube and it works perfect with the web browser. However the client and the seadrive apps can’t sync. The client sees the folders and files on the server and can upload and download but not sync. The android app seems to be fine using the HTTPS address. The only way to get the client to Sync is to put the non HTTPS ports :8000 at the end of the address.

Thanks for your help,

Thanks everyone but I just figured it out. There was a command in the Web config file set to false.