Umbraco site GOLIVE checklist
- Set debug=false in system.web section
<compilation defaultLanguage="c#" debug="false" batch="false" targetFramework="4.5">
- Verify custom error mode is RemoteOnly , defaultRedirect is defined and errorpage.html is located in root
<customErrors defaultRedirect="errorpage.html" mode="RemoteOnly" />
- httpErrors defined in system.webServer section of the web.config
<httpErrors existingResponse="PassThrough"/>