there is more ways to Fix Error Code 268 Unexpected Client Behavior Roblox and in this article i will explain the ways step by step :
1 - change dns to google dns
in taskbar search for control panel then in the top right you will find option View by change it to Large icons then choose Network and Sharing Center then in the option Connections Press wifi or internet name and in the activity choose Properties and choose Internet Protocol Version 4 (TCP/IPv4) then Press Properties and choose Use the following DNS server addresses
then check option Validate settings upon exit then press Ok and Press Close .
