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Ubuntu20 VDA not getting registered after Machine Catalog creation

Bril licenses


the VDI machine i listed as not registered under machine catalog.

service status in VDA is as below:

● ctxhdx.service - Citrix HDX Service
     Loaded: loaded (/etc/systemd/system/ctxhdx.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2023-07-19 10:02:32 +04; 4h 8min ago
   Main PID: 3428 (ctxhdx)
      Tasks: 19 (limit: 11752)
     Memory: 3.9M
     CGroup: /system.slice/ctxhdx.service
             └─3428 /opt/Citrix/VDA/bin/ctxhdx
● ctxvda.service - Citrix DotNet VDA Service
     Loaded: loaded (/etc/systemd/system/ctxvda.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2023-07-19 14:10:37 +04; 5s ago
   Main PID: 4278 (ctxvda)
      Tasks: 26 (limit: 11752)
     Memory: 35.3M
     CGroup: /system.slice/ctxvda.service
             ├─4278 /bin/sh /opt/Citrix/VDA/sbin/ctxvda
             └─4282 /usr/bin/dotnet /opt/Citrix/VDA/lib64/BrokerAgentLinux.dll

VDA log error:
[2023/07/19 13:16:12.8725435] [BrokerAgentAoTracing] [Information] REGISTRATION Registration request sending: SID: S-1-5-21-3848371005-2894319767-1593367370-3313, VDA IP: 10.140.x.x, Broker IP: 10.140.x.x, VDA Name: XUVD01.xx.LOCAL, VDA capabilities: [Name=DesktopDelivery, Data=NULL_DATA, ExtensionData=NULL_EXTENSIONDATA],[Name=IcaProtocol, Data=NULL_DATA, ExtensionData=NULL_EXTENSIONDATA], Agent version:,  OS type: Ubuntu 20.04.6 LTS version: Ubuntu.20.04
[2023/07/19 13:16:12.8851070] [BrokerAgent] [Error] GetMachineMetadataJsonString: Error getting machine metadata from MachineMetadataQueryManager System.NullReferenceException: Object reference not set to an instance of an object.
   at Citrix.Cds.BrokerAgent.RegistrationManager.WaitAndGetMachineMetadataJsonString()
[2023/07/19 13:16:12.9110949] [BrokerAgentAoTracing] [Information] BROKER AGENT -> HDX STACK Enumerate Sessions Request: Transaction unique ID: 50efed82-4a4b-4d69-a6bf-71a4b5bfa74a, VDA IP:
[2023/07/19 13:16:12.9196594] [BrokerAgentAoTracing] [Information] STATUS QUERY Query All Sessions Success: VDA machine SID: S-1-5-21-3848371005-2894319767-1593367370-3313, Transaction unique local ID: 2bb215cb-628c-4842-82dc-ba458a841ab5, Broker IP addresses: NULL_INFORMATIONMANAGER OR NULL_REGISTEREDDDCIP
[2023/07/19 13:16:14.6390780] [BrokerAgent] [Error] AttemptRegistrationWithSingleDdc: Registration with 'DC.xx.local @ 10.140.x.x' failed. RejectionCode='AgentNotContactable'


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