If extended hostname validation is enabled, ensure that the Application Enablement Services collector’s identity certificate CN/SAN (DNSname) field matches the FQDN/IP of the Application Enablement Services. If you change the enabled or disabled behavior on Presence Services specifically for Application Enablement Services, you must restart the service in order for the changes to take effect. Failing the hostname validation will impact Presence Services ability to connect with Application Enablement Services and you will receive phone-related presence events (for non-presence capable phones). For more information, see Extended hostname validation
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