How to fix issue while configuring ACS server in HA?

[hassanwalikhan]

Senior.

I have ACS server primary and secondary, both ACS server's have same subnet ip address and also in same vlan. while i'm configure ACS in HA i'm facing issue like error. "This system Failure occurred: Registration failed due to Invalid Certificate. Your changes have not been saved.Click OK to return to the list page."

[jeffery.price]

Check your trust communication settings.  if enable nodes trust communications box is checked uncheck and it will work.

[hassanwalikhan]

I'm also trying to unchecked trust communication but still not working yet and i'm facing another error 

[nspasov]

Yep, Jeffery is correct. This additional security feature was added in version 5.5. Check the thread below for more info:

https://supportforums.cisco.com/discussion/12010171/problems-acs-55-trial-and-primary-secondary-node-registration

I hope this helps!

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