Here's how to fix Roblox error code 277 (Disconnection Error) and 901 (Authentication Error) on Windows 11/10 PC or Xbox One.

Roblox error code 277 means that the Roblox client has lost connection to the game server. this problem can happen on all platforms such as Mobile, Windows 10, Xbox and Playstation.

Clear Roblox Log Files 1] Allow Roblox through Windows Defender Firewall Firewall system is designed to monitor and control incoming and outgoing network traffic based on preconfigured security rules.