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Troubleshoot Azure Connected Machine agent connection issues

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This article provides information for troubleshooting issues that might occur while configuring the Azure Connected Machine agent for Windows or Linux. Both the interactive and at-scale installation methods when configuring connection to the service are included. For general information, see Azure Arc-enabled servers overview.

Agent error codes

Use the following table to identify and resolve issues when configuring the Azure Connected Machine agent using the AZCM0000 ("0000" can be any four digit number) error code printed to the console or script output.

Error code Probable cause Suggested remediation
AZCM0000 The action was successful N/A
AZCM0001 An unknown error occurred Contact Microsoft Support for assistance.
AZCM0011 The user canceled the action (CTRL+C) Retry the previous command.
AZCM0012 The access token is invalid If authenticating via access token, obtain a new token and try again. If authenticating via service principal or device logins, contact Microsoft Support for assistance.
AZCM0016 Missing a mandatory parameter Review the error message in the output to identify which parameters are missing. For the complete syntax of the command, run azcmagent <command> --help.
AZCM0018 The command was executed without administrative privileges Retry the command in an elevated user context (administrator/root).
AZCM0019 The path to the configuration file is incorrect Ensure the path to the configuration file is correct and try again.
AZCM0023 The value provided for a parameter (argument) is invalid Review the error message for more specific information. Refer to the syntax of the command (azcmagent <command> --help) for valid values or expected format for the arguments.
AZCM0026 There's an error in network configuration or some critical services are temporarily unavailable Check if the required endpoints are reachable (for example, hostnames are resolvable, endpoints aren't blocked). If the network is configured for Private Link Scope, a Private Link Scope resource ID must be provided for onboarding using the --private-link-scope parameter.
AZCM0041 The credentials supplied are invalid For device logins, verify that the user account specified has access to the tenant and subscription where the server resource will be created. For service principal logins, check the client ID and secret for correctness, the expiration date of the secret, and that the service principal is from the same tenant where the server resource will be created.
AZCM0042 Creation of the Azure Arc-enabled server resource failed Review the error message in the output to identify the cause of the failure to create resource and the suggested remediation. For more information, see Connected Machine agent prerequisites-required permissions for more information.
AZCM0043 Deletion of the Azure Arc-enabled server resource failed Verify that the user/service principal specified has permissions to delete Azure Arc-enabled server/resources in the specified group. For more information, see Connected Machine agent prerequisites-required permissions. If the resource no longer exists in Azure, use the --force-local-only flag to proceed.
AZCM0044 A resource with the same name already exists Specify a different name for the --resource-name parameter or delete the existing Azure Arc-enabled server in Azure and try again.
AZCM0062 An error occurred while connecting the server Review the error message in the output for more specific information. If the error occurred after the Azure resource was created, delete this resource before retrying.
AZCM0063 An error occurred while disconnecting the server Review the error message in the output for more specific information. If this error persists, delete the resource in Azure, and then run azcmagent disconnect --force-local-only on the server.
AZCM0067 The machine is already connected to Azure Run azcmagent disconnect to remove the current connection, then try again.
AZCM0068 Subscription name was provided, and an error occurred while looking up the corresponding subscription GUID. Retry the command with the subscription GUID instead of subscription name.
AZCM0061
AZCM0064
AZCM0065
AZCM0066
AZCM0070
 The agent service isn't responding or unavailable Verify the command is run in an elevated user context (administrator/root). Ensure that the HIMDS service is running (start or restart HIMDS as needed) then try the command again.
AZCM0081 An error occurred while downloading the Microsoft Entra managed identity certificate If this message is encountered while attempting to connect the server to Azure, the agent won't be able to communicate with the Azure Arc service. Delete the resource in Azure and try connecting again.
AZCM0101 The command wasn't parsed successfully Run azcmagent <command> --help to review the command syntax.
AZCM0102 An error occurred while retrieving the computer hostname Retry the command and specify a resource name (with parameter --resource-name or –n). Use only alphanumeric characters, hyphens and/or underscores; note that resource name can't end with a hyphen or underscore.
AZCM0103 An error occurred while generating RSA keys Contact Microsoft Support for assistance.
AZCM0105 An error occurred while downloading the Microsoft Entra ID managed identify certificate Delete the resource created in Azure and try again.
AZCM0147-
AZCM0152		 An error occurred while installing Azcmagent on Windows Review the error message in the output for more specific information.
AZCM0127-
AZCM0146		 An error occurred while installing Azcmagent on Linux Review the error message in the output for more specific information.
AZCM0150 Generic failure during installation Submit a support ticket to get assistance.
AZCM0153 The system platform isn't supported Review the prerequisites for supported platforms
AZCM0154 The version of PowerShell installed on the system is too old Upgrade to PowerShell 4 or later and try again.
AZCM0155 The user running the installation script doesn't have administrator permissions Re-run the script as an administrator.
AZCM0156 Installation of the agent failed Confirm that the machine isn't running on Azure. Detailed errors might be found in the installation log at %TEMP%\installationlog.txt.
AZCM0157 Unable to download repo metadata for the Microsoft Linux software repository Check if a firewall is blocking access to packages.microsoft.com and try again.

Agent verbose log

Before following the troubleshooting steps described later in this article, the minimum information you need is the verbose log. It contains the output of the azcmagent tool commands, when the verbose (-v) argument is used. The log files are written to %ProgramData%\AzureConnectedMachineAgent\Log\azcmagent.log for Windows, and Linux to /var/opt/azcmagent/log/azcmagent.log.

Windows

Following is an example of the command to enable verbose logging with the Connected Machine agent for Windows when performing an interactive installation.

& "$env:ProgramFiles\AzureConnectedMachineAgent\azcmagent.exe" connect --resource-group "resourceGroupName" --tenant-id "tenantID" --location "regionName" --subscription-id "subscriptionID" --verbose

Following is an example of the command to enable verbose logging with the Connected Machine agent for Windows when performing an at-scale installation using a service principal.

& "$env:ProgramFiles\AzureConnectedMachineAgent\azcmagent.exe" connect `
  --service-principal-id "{serviceprincipalAppID}" `
  --service-principal-secret "{serviceprincipalPassword}" `
  --resource-group "{ResourceGroupName}" `
  --tenant-id "{tenantID}" `
  --location "{resourceLocation}" `
  --subscription-id "{subscriptionID}"
  --verbose

Linux

Following is an example of the command to enable verbose logging with the Connected Machine agent for Linux when performing an interactive installation.

Note

You must have root access permissions on Linux machines to run azcmagent.

azcmagent connect --resource-group "resourceGroupName" --tenant-id "tenantID" --location "regionName" --subscription-id "subscriptionID" --verbose

Following is an example of the command to enable verbose logging with the Connected Machine agent for Linux when performing an at-scale installation using a service principal.

azcmagent connect \
  --service-principal-id "{serviceprincipalAppID}" \
  --service-principal-secret "{serviceprincipalPassword}" \
  --resource-group "{ResourceGroupName}" \
  --tenant-id "{tenantID}" \
  --location "{resourceLocation}" \
  --subscription-id "{subscriptionID}"
  --verbose

Agent connection issues to service

The following table lists some of the known errors and suggestions on how to troubleshoot and resolve them.

Message Error Probable cause Solution
Failed to acquire authorization token device flow Error occurred while sending request for Device Authorization Code: Post https://login.windows.net/fb84ce97-b875-4d12-b031-ef5e7edf9c8e/oauth2/devicecode?api-version=1.0: dial tcp 40.126.9.7:443: connect: network is unreachable. Can't reach login.windows.net endpoint Run azcmagent check to see if a firewall is blocking access to Microsoft Entra ID.
Failed to acquire authorization token device flow Error occurred while sending request for Device Authorization Code: Post https://login.windows.net/fb84ce97-b875-4d12-b031-ef5e7edf9c8e/oauth2/devicecode?api-version=1.0: dial tcp 40.126.9.7:443: connect: network is Forbidden. Proxy or firewall is blocking access to login.windows.net endpoint. Run azcmagent check to see if a firewall is blocking access to Microsoft Entra ID.
Failed to acquire authorization token from SPN Failed to execute the refresh request. Error = 'Post https://login.windows.net/fb84ce97-b875-4d12-b031-ef5e7edf9c8e/oauth2/token?api-version=1.0: Forbidden' Proxy or firewall is blocking access to login.windows.net endpoint. Run azcmagent check to see if a firewall is blocking access to Microsoft Entra ID.
Failed to acquire authorization token from SPN Invalid client secret is provided Wrong or invalid service principal secret. Verify the service principal secret.
Failed to acquire authorization token from SPN Application with identifier 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' wasn't found in the directory 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'. This can happen if the application has not been installed by the administrator of the tenant or consented to by any user in the tenant Incorrect service principal and/or Tenant ID. Verify the service principal and/or the tenant ID.
Get ARM Resource Response The client 'username@domain.com' with object id 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx' does not have authorization to perform action 'Microsoft.HybridCompute/machines/read' over scope '/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourcegroups/myResourceGroup/providers/Microsoft.HybridCompute/machines/MSJC01' or the scope is invalid. If access was recently granted, please refresh your credentials."}}" Status Code=403 Wrong credentials and/or permissions Verify you or the service principal is a member of the Azure Connected Machine Onboarding role.
Failed to AzcmagentConnect ARM resource The subscription isn't registered to use namespace 'Microsoft.HybridCompute' Azure resource providers aren't registered. Register the resource providers.
Failed to AzcmagentConnect ARM resource Get https://management.azure.com/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourcegroups/myResourceGroup/providers/Microsoft.HybridCompute/machines/MSJC01?api-version=2019-03-18-preview: Forbidden Proxy server or firewall is blocking access to management.azure.com endpoint. Run azcmagent check to see if a firewall is blocking access to Azure Resource Manager.

Next steps

If you don't see your problem here or you can't resolve your issue, try one of the following channels for more support:

  • Get answers from Azure experts through Microsoft Q&A.

  • Connect with @AzureSupport, the official Microsoft Azure account for improving customer experience. Azure Support connects the Azure community to answers, support, and experts.

  • File an Azure support incident. Go to the Azure support site, and select Get Support.