Enable alternate error pages
Supported on: Microsoft Windows 7 or later
Registry
HKLM
Software\Policies\Google\Chrome HKCU
Software\Policies\Google\Chrome Value name: AlternateErrorPagesEnabled
Enabled: AlternateErrorPagesEnabled = 1
Disabled: AlternateErrorPagesEnabled = 0
Description
Setting the policy to True means Google Chrome uses alternate error pages built into (such as "page not found"). Setting the policy to False means Google Chrome never uses alternate error pages. If you set the policy, users can't change it. If not set, the policy is on, but users can change this setting.