PLANET CS-2001 - Manual (Page 221)

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Step 1. Under
Policy > Outgoing, set as below: （Figure 9-3）
 Application Blocking: Select the name of the Application Blocking
setting.
 Click OK.
（Figure 9-4）
Figure 9-3 Applying IM Blocking to a Policy
Figure 9-4 A Policy with IM Blocking