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.

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

Basic Reinstall: Uninstall Roblox through your control panel (or Apps settings) and then download and install a fresh copy from the Roblox website. This is your first line of defense.