Eaglercraft does not use official Mojang authentication. Most servers run in offline mode. Fix: In the client’s main menu, go to Options > Skin/Cape . Ensure your username does not contain spaces or special characters. Change it to something simple like "Player123".
Version 1.5.2 (the "Redstone Update" era) is popular because it is lightweight, stable, and nostalgic for players who started in 2013. eaglercraft server ip 1.5.2
The IP is offline, the port is wrong, or your network (school/work firewall) blocks WebSockets. Fix: Try adding https:// or wss:// before the IP in the address bar. Some Eaglercraft clients require the protocol. Also, try a different IP from your list. Eaglercraft does not use official Mojang authentication