I attempted to mount a WebDAV server on macOS using Finder. The mount was successful when using the server's IPv4 address or hostname, but failed when using its IPv6 address. I also tested the mount using the NetFS framework API via NetFSMountURLSync. The results were consistent: the mount succeeded with the IPv4 address and hostname but failed when using the IPv6 address. While observing live logs via Console.app, I saw that the process NetAuthSysAgent produced the following error during the IPv6 mount attempt: GetServerInfo failed with error 5