Ingress-request message from a downstream peer is rejected by a Local Node when no peer-routing rules are found in the Peer Routing Table (PRT) and one of the following is true:
The Realm Route Table (table RealmRoute) managed object is used to perform message routing based upon the Destination-Realm and Application-ID in a request message. The Realm Route Table is dynamically configured on the active SOAM via Diameter > Configuration > Peer Discovery > Realms.
Analyze the event history and event #22005 which will have following information regarding the failure diameter message:
The Diameter Ingress Transaction Exception group measurement report contains the RxNoRulesFailure (10034) measurement, which is also pegged in the same scenario.
Recovery: