Page Comparison

...

<configuration>       
        :
  <system.web>
        :
     <httpCookies ... requireSSL="true" />
        :
   < </system.web>
        : 
</configuration> 

Enable SameSite flag

To enable the SameSite flag Settingon cookies the Web.config needs to be extended with a rewrite rule. To be able to use rewriting within IIS, the URL Rewrite component needs to be installed. More information can be found here: IIS Rewrite module.

After this component is installed, add the following configuration to the system.webServer section.

<configuration>
        :
  <system.webserver>
        :
    <rewrite>
      <outboundRules>
        <rule name="Add SameSite" preCondition="No SameSite">
          <match serverVariable="RESPONSE_Set_Cookie" pattern=".*" negate="false" />
          <action type="Rewrite" value="{R:0}; SameSite=strict" />
        </rule>
        <preConditions>
          <preCondition name="No SameSite">
            <add input="{RESPONSE_Set_Cookie}" pattern="." />
            <add input="{RESPONSE_Set_Cookie}" pattern="; SameSite=strict" negate="true" />
          </preCondition>
        </preConditions>
      </outboundRules>
    </rewrite>
  </system.webserver>
        :
</configuration>