Convert Rules with Few Apps Seen Over a Time Period

Convert legacy port-based security policy rules that have seen the fewest applications to application-based rules.
Rules with relatively few
Apps Seen
and with no new applications seen over a long enough time period may be easy to convert, relatively stable, and easy to identify using filters.
  1. In
    Policies
    Security
    Policy Optimizer
    No App Specfied
    , filter the rules to display only rules with a low number of
    Apps Seen
    and that have seen no applications over a specific time period.
    apps-seen-over-time-filter-example.png
    This example filters for rules that have seen three or fewer applications
    (apps seen count leq ‘3’)
    and for which no applications have been seen for at least 30 days
    (days no new app count geq ‘30’)
    .
  2. Select a rule to convert and click the number of
    Apps Seen
    .
  3. In the
    Applications & Usage
    dialog, decide whether you want to allow all of the applications and if they should be in the same rule—that is, decide whether the applications require similar treatment in terms of access and security.
    If you want to allow all of the applications and they require similar treatment, you can
    Match Usage
    and replace the port-based rule with the new App-ID based rule.
    If you want to allow all of the applications but they require different treatment, clone the rule for each set of applications that requires different treatment. For example, if a port-based rule allows three applications and two of them are email applications and one is an infrastructure application, you may want to clone one rule for the email applications and another for the infrastructure application.
    If you want to allow some applications and deny others:
    • Clone one or more rules for the applications you want to keep and monitor the original port-based rule to ensure that the applications you don’t want to keep are the only ones that match that rule. When enough time has passed that you feel confident no applications you want to allow match the port-based rule, you can disable or delete it. Step 4 through Step 7 in Convert Internet Access Rules show how to create a cloned rule.
    • If you’re confident you know which applications you want to allow and which applications you want to block:
      • If the applications you want to allow require similar treatment, use
        Add to Rule
        to replace the port-based rule with an application-based rule that allows only the applications you added to the rule. The applications you don’t add to the rule are blocked unless you allow them in another rule.
      • If the applications you want to allow require different treatment, clone application-based rules for the applications you want to allow from the port-based rule. If you’re still confident it’s OK to block the remaining applications, you can disable (or delete) the port-based rule.

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