Sharing an X Server Across Hosts with FamilyWild
Summary
This article explains how X11 cookies can fail when an X server is used across different hosts or containers, due to hostname-bound cookies. It introduces FamilyWild (0xffff) as a workaround by rewriting Xauthority cookies so they match any hostname, enabling cross-host access, and contrasts this with the insecure xhost + approach. It also notes security caveats and links to a deeper write-up on forwarding X into LXC containers.