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Jeremy Sherlock

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NotificationBroker Client Error every second

Since we installed Exchange 2016 on premise in March 2019 it has been generating an error every second in the NotificationBroker Client Log. It does not appear to be causing any issues, the only reason we discovered this was the amount of logs that are being generated. We migrated from Exchange 2010 but have decommissioned this and so now just have a single 2016 server. Is it possible to resolve this?
2020-02-24T09:14:41.994Z,zzzEX01,ReceiveNotification,"S:CsmId=OData;S:Sts=UnknownError;S:L=0;S:Ex=Microsoft.Exchange.Rpc.RpcException: Error 0x6d9 (There are no more endpoints available from the endpoint mapper) from ClientAsyncCallState.CheckCompletion: RpcAsyncCompleteCall \r\nEEInfo: ComputerName: \r\nEEInfo: ProcessID: 27252\r\nEEInfo: Generation Time: 24/02/2020 09:14:41\r\nEEInfo: Generating component: 2\r\nEEInfo: Status: 0x000006D9\r\nEEInfo: Detection location: 950\r\nEEInfo: Flags: 0\r\nEEInfo: NumberOfParameters: 0\r\n\r\n\r\n   at Microsoft.Exchange.Rpc.ClientAsyncCallState.CheckCompletion()\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.ClientAsyncCallState_GetNextNotification.End(String& notification)\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.NotificationsBrokerRpcClient.EndGetNextNotification(ICancelableAsyncResult asyncResult, String& notification)\r\n   at Microsoft.Exchange.Data.Notification.NotificationClient.<>c__DisplayClass36_0.<OnNotification>b__0(NotificationClientLogEvent logEvent)"
2020-02-24T09:14:42.995Z,zzzEX01,ReceiveNotification,"S:CsmId=OData;S:Sts=UnknownError;S:L=0;S:Ex=Microsoft.Exchange.Rpc.RpcException: Error 0x6d9 (There are no more endpoints available from the endpoint mapper) from ClientAsyncCallState.CheckCompletion: RpcAsyncCompleteCall \r\nEEInfo: ComputerName: \r\nEEInfo: ProcessID: 27252\r\nEEInfo: Generation Time: 24/02/2020 09:14:42\r\nEEInfo: Generating component: 2\r\nEEInfo: Status: 0x000006D9\r\nEEInfo: Detection location: 950\r\nEEInfo: Flags: 0\r\nEEInfo: NumberOfParameters: 0\r\n\r\n\r\n   at Microsoft.Exchange.Rpc.ClientAsyncCallState.CheckCompletion()\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.ClientAsyncCallState_GetNextNotification.End(String& notification)\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.NotificationsBrokerRpcClient.EndGetNextNotification(ICancelableAsyncResult asyncResult, String& notification)\r\n   at Microsoft.Exchange.Data.Notification.NotificationClient.<>c__DisplayClass36_0.<OnNotification>b__0(NotificationClientLogEvent logEvent)"
2020-02-24T09:14:43.996Z,zzzEX01,ReceiveNotification,"S:CsmId=OData;S:Sts=UnknownError;S:L=0;S:Ex=Microsoft.Exchange.Rpc.RpcException: Error 0x6d9 (There are no more endpoints available from the endpoint mapper) from ClientAsyncCallState.CheckCompletion: RpcAsyncCompleteCall \r\nEEInfo: ComputerName: \r\nEEInfo: ProcessID: 27252\r\nEEInfo: Generation Time: 24/02/2020 09:14:43\r\nEEInfo: Generating component: 2\r\nEEInfo: Status: 0x000006D9\r\nEEInfo: Detection location: 950\r\nEEInfo: Flags: 0\r\nEEInfo: NumberOfParameters: 0\r\n\r\n\r\n   at Microsoft.Exchange.Rpc.ClientAsyncCallState.CheckCompletion()\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.ClientAsyncCallState_GetNextNotification.End(String& notification)\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.NotificationsBrokerRpcClient.EndGetNextNotification(ICancelableAsyncResult asyncResult, String& notification)\r\n   at Microsoft.Exchange.Data.Notification.NotificationClient.<>c__DisplayClass36_0.<OnNotification>b__0(NotificationClientLogEvent logEvent)"
2020-02-24T09:14:45.006Z,zzzEX01,ReceiveNotification,"S:CsmId=OData;S:Sts=UnknownError;S:L=0;S:Ex=Microsoft.Exchange.Rpc.RpcException: Error 0x6d9 (There are no more endpoints available from the endpoint mapper) from ClientAsyncCallState.CheckCompletion: RpcAsyncCompleteCall \r\nEEInfo: ComputerName: \r\nEEInfo: ProcessID: 27252\r\nEEInfo: Generation Time: 24/02/2020 09:14:45\r\nEEInfo: Generating component: 2\r\nEEInfo: Status: 0x000006D9\r\nEEInfo: Detection location: 950\r\nEEInfo: Flags: 0\r\nEEInfo: NumberOfParameters: 0\r\n\r\n\r\n   at Microsoft.Exchange.Rpc.ClientAsyncCallState.CheckCompletion()\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.ClientAsyncCallState_GetNextNotification.End(String& notification)\r\n   at Microsoft.Exchange.Rpc.NotificationsBroker.NotificationsBrokerRpcClient.EndGetNextNotification(ICancelableAsyncResult asyncResult, String& notification)\r\n   at Microsoft.Exchange.Data.Notification.NotificationClient.<>c__DisplayClass36_0.<OnNotification>b__0(NotificationClientLogEvent logEvent)"

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