What happens if the certificate expire on a ISE PSN

What happens if a PSN certificate expire? Does all other nodes in the cluster looses the communication channel to that PSN node?
What is the procedure to install a new certificate on a PSN node with the expired certificate?
Does the PSN node still handle client RADIUS requests that does not depend on the PSN cerfificate?
Tanks!

You definitely want to renew the certs before they expire. Otherwise the effects can be very devastating to your ISE environment depending on what the certificates are used for :) Below are a couple of links that you can use to obtain more info on both of your questions:
ISE version 1.2:
http://www.cisco.com/c/en/us/support/docs/security/identity-services-engine/116977-technote-ise-cert-00.html
ISE Version 1.3:
http://www.cisco.com/c/en/us/td/docs/security/ise/1-3/admin_guide/b_ise_admin_guide_13/b_ise_admin_guide_sample_chapter_01000.html#concept_D7826198A3304303AD046DB981DA4FE6
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What happens if the certificate expire on a ISE PSN

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