IPv6 often bypasses NAT restrictions because each device has a unique public IP address. On both host and client:
Disable "pseudorandom ports" if necessary by locking the client port to and the host to 8002 to keep firewalls stabilized. 6023 parsec error exclusive
These solutions are free for personal use and require no router configuration. They work flawlessly even on China Mobile, corporate networks, and cellular hotspots where -6023 errors are otherwise unavoidable. IPv6 often bypasses NAT restrictions because each device
Ensure your network is set to Private rather than Public. Public networks often have built-in firewalls that block P2P connections. 2. Configure Your Firewall along with your router.
Reboot both the host and client computers, along with your router.