Apple's macOS Sequoia 15.5 update deprecates support for Apple Filing Protocol (AFP) used to connect to servers and local computers.
AFP, Apple's old peer-to-peer protocol for file sharing, has been deprecated with this update, with support already ended with macOS 11.0 Big Sur.
Users can still use AFP to connect to older UNIX-only servers, but support is waning as NAS makers like Synology shift to the more widely supported SMB protocol.
Users relying on AFP are advised to switch to Server Message Block (SMB) or other supported protocols like CIFS and NFS, as AFP support is gradually phased out.