EPiServer Admin Import data – Fixing the Request timed out exception

If you are importing a big file of data into EPiServer through the admin import data feature, you might get this exception:

Exception Details: System.Web.HttpException: Request timed out.

ASP.NET has a timeout of 120 seconds by default, you can increase this setting for the admin section only using the following setting.

Add this directly under the location path admin / system.web element:

<httpRuntime executionTimeout="999999" maxRequestLength="2097151" />

E.g. in web.config:

...
<location path="epi/CMS/admin">
    <system.web>
      <httpRuntime executionTimeout="999999" maxRequestLength="2097151" /> 
      <authorization>
        <allow roles="WebAdmins, Administrators" />
        <deny users="*" />
      </authorization>
    </system.web>
  </location>
...

Source: https://support.microsoft.com/en-ca/help/925083/error-request-timed-out-when-you-try-to-upload-a-large-file-to-a-docum