To configure a custom block page message
Navigate to OBJECT | Profile Objects > Block Page.
Click the Add icon.
Do one of the following:
This site has been blocked by the network administrator.
Specify a Base 64-encoded GIF icon n the Base64-encoded Logo Icon field if you want to replace the default SonicWall logo.
Ensure the icon is valid and make the size as small as possible. The recommended size is 400 x 65.
Click Preview to display the preview of your customized message and logo (or the default message and logo).
Click OK.
The Web Site Blocked message displays.
Click Add.
New block page is added to the table.