60899: Acronis Cyber Backup 12.5: Troubleshooting adding machine to Management Server failures

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Last update: 31-05-2021

How to troubleshoot issues with adding Agent to Management Server in on-premises installation.

Possible error messages:

Failed to connect to the management server


Make sure that you have followed steps described in User’s Guide correctly: see product documentation

If you try to add a Machine to the Acronis Management Server as part of an installation, it important to confirm if the Agent was actually installed on the machine that you want to add. Open running services on that machine and check if Acronis Managed Machine service and Acronis Remote Agent service are present and running.

Make sure the following requirements are met:

  1. All necessary services are running on Acronis Management Server and services are running under the correct user

    If some service is not running, start it. Check under which account the services are running. If the account used by the service on the machine does not match the account specified in the article, change the account used by the service: right-click on the service, select Properties -> Log on and specify the necessary account

    On the Agent machine, check that Acronis Managed Machine service and Acronis Remote Agent service are present and running. Make sure the Remote Agent Service is running under Local system account.

  2. Make sure all the necessary ports are open and not blocked by firewall or other security software.See Firewall settings for Acronis products

If Agent is already installed on the client machine, try adding the machine to Management Server manually as described here 

Known issues:

Acronis Cyber Backup: manual registration of backup agent fails with “Failed to encrypt data. The system cannot find the file specified”.

Acronis Cyber Backup 12.5: Agent registration fails with error "Could not resolve host: localhost; nodename nor servname provided, or not known" on macOS


  1. If you have tried to add the machine via Add button of Management Server, then go to Overview -> Activities, find the log of the operation, and check details of the operation (double-click on the activity or click Show Details). Check activity details to see if that will give you more information for finding the cause of the issue.
  2. Check that Agent and Management Server have the same product build. You can find the Agent build in the following locations:
    • Windows: C:\ProgramData\Acronis\BackupAndRecovery_version.txt
    • Linux/var/lib/Acronis/BackupAndRecovery_version.txt
  3. Use ping to check if the Agent machine is reachable. Open the Command prompt and issue ping <hostname/IP> where <hostname/IP> is the name or the IP address of the Agent machine.
  4. Use telnet to test if port 9876 is open. Acronis uses port 9876 for communication between components. Open the Command prompt (Start -> Run -> cmd) and issue telnet <hostname/ip> 9876 where <hostname/ip> is the name or the IP address of Agent machine. If the port is open, you will see a black screen (connection successful). If you see some message, it means the connection could not be established: check the message for information that may help you resolve the issue.
  5. After checking the network, attempt to add the machine manually: see Acronis Cyber Backup 12.5: how to manually add a machine to management server
  6. In case you are adding two machines with the same name, and one of them fails to add, check if the same "MMSCurrentMachineID" and "InstanceID" values are used on both machines. You can find the values in the following locations:
    • Windows: registry key HKEY_LOCAL_MACHINE\Software\Acronis\BackupAndRecovery\Settings\MachineManager
    • Linux:  /etc/Acronis/BackupAndRecovery.config file
    • macOS:  /Library/Application Support/Acronis/Registry/BackupAndRecovery.config

    If MMSCurrentMachineID and InstanceID values are the same (this can happen if the machine was cloned or recovered to new hardware), change the values on one of the machines as described in How to change MMScurrentMachineID and InstanceID

Collect information

If the above steps do not help resolve the issue, collect the following information and contact Acronis Support:

  1. If the Agent is installed on the same machine where Acronis Management Server is installed, download Process Monitor and collect Process Monitor log while reproducing the issue. See Collecting Process Monitor Log for instructions.
  2. Collect System information from Agent and Management Server as described in Acronis Cyber Backup 12.5 and 12: how to collect system information