How can the IPS inspect the encrypted packets?

dear experts, hello
i'd like to ask a question about how the IPS can inspect and prevent any atteck in the encrypted packets in some sessions
such as vpn or ssh sessions, is there a technique helping for
that in the IPS?
thanks alot for your help
labib makar

Labib;
  For traffic exiting a VPN tunnel, you can place the IPS sensor behind the VPN termination point so it has access to the unencrypted traffic.
  There is not an option to inspect SSL encrypted traffic; you would need to rely on a host-based system such as Cisco Security Agent to assist in providing such protection.
Scott

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