Install Sana Commerce Webshop on Web and Database Server

Step 1: Open the 'web.config' of the Sana Commerce frontend project in any text editor.

Step 2: Locate the 'customErrors' section in the 'system.web' configuration section:

<customErrors mode="RemoteOnly">
    <error statusCode="404" redirect="~/PageNotFound.aspx"/>
    <error statusCode="500" redirect="~/PageError.aspx"/>
</customErrors>

Step 3: Configure the 404 & 500 'statusCodes'. Also, set the mode attribute of the 'customErrors' node to 'RemoteOnly' to make sure the customer 404 & 500 pages are shown to external visitors. Local visitors, who visit through the web browser on the server, will be presented the error messages for debugging reasons. 

Step 1: Open the IIS Manager ('Start > Administrative Tools').

Step 2: Select your website, click right and choose 'Properties'.

Step 3: Click the 'Custom Errors' tab.

Step 4: Search for the 404 error and click the 'Edit' button.

Step 5: Select the 'URL' in the 'Message type' dropdown.

Step 6: Enter '/PageNotFound.aspx' in the 'URL' field.

Step 7: Repeat the steps for error 500;100, but enter '/PageError.aspx' in the 'URL' field instead:

 
Configuring Custom Error Pages in IIS 6