You need to activate WebDAV if you want to access your Synology NAS DS713+ on the internet. It is very simple and can be explained in a few simple steps:

1. Click on “main menu” and then “Control Panel”

2. On “File Sharing and Privileges” click on WebDAV

3. Click on ” Enable WebDAV” and “Enable WebDAV https” and leave the ports as they are:

4. Click “Apply” and you are done!

And you can now proceed with the next steps on how to access your Synology NAS DS713+ on the internet.