Q: How do I resolve home sharing error -3259?

Welcome to the Apple Community.

This alert is often the result of iTunes being blocked by firewalls on the computer.

1. Update to the latest version of iTunes.
2. Try turning off your Firewall to see if the issue is resolved (this includes the built-in Firewall or a third-party Firewall such as Norton Personal Firewall, McAfee, Symantec, etc.). See iTunes: Music Sharing does not work if Firewall is on for steps if using Mac OS X.
3. If there's no firewall or security software interference, try to remove proxy settings.