Session security settings work in association with access policies for reports and session policies for connected apps. By configuring session security levels, you can restrict access to reports and connected apps, depending on the security level that is set for the user's current session based on the authentication method that was invoked when they logged into Salesforce CRM.
There are a number of authentication methods that are set by default and are assigned with an initial security level. To modify the session security levels for each authentication method, navigate to Setup | Security Controls | Session Settings. Locate Session Security Levels, select the login authentication method, and click the Add or Remove arrow to assign the method to the required session security level, as shown in the following screenshot:
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