az network bastion ssh fails with KeyError checking for Native Client support #32845
Description
Describe the bug
After deploying a bastion (Standard SKU)+VM instance, I attempted to ssh from the WSL2 command line and received the following error:
The command failed with an unexpected error. Here is the traceback:
'enableTunneling'
Traceback (most recent call last):
File "/opt/az/lib/python3.13/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 669, in execute
raise ex
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 737, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 706, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 336, in __call__
return self.handler(*args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
return op(**command_args)
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 183, in ssh_bastion_host
if not _is_nativeclient_enabled(bastion):
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 395, in _is_nativeclient_enabled
return bastion['enableTunneling']
~~~~~~~^^^^^^^^^^^^^^^^^^^
KeyError: 'enableTunneling'
Reviewing the "Automation > Export Template" output through the portal, I noticed that the generated Bicep did not include most of the properties found on the Bastion "Settings > Configuration" page. Once I enabled Native Client support, I re-generated the template, which then showed all configuraiton properties, even those set to false.
Related command
az network bastion ssh --name testcjo-bastion-dev --resource-group cjotestev2 --target-resource-id /subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Compute/virtualMachines/testcjo-vm-dev --auth-type "ssh-key" --ssh-key ~/.ssh/id_rsa.dev-deploy-vm --username vmadmin
Errors
The command failed with an unexpected error. Here is the traceback:
'enableTunneling'
Traceback (most recent call last):
File "/opt/az/lib/python3.13/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 669, in execute
raise ex
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 737, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 706, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 336, in __call__
return self.handler(*args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
return op(**command_args)
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 183, in ssh_bastion_host
if not _is_nativeclient_enabled(bastion):
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 395, in _is_nativeclient_enabled
return bastion['enableTunneling']
~~~~~~~^^^^^^^^^^^^^^^^^^^
KeyError: 'enableTunneling'
Issue script & Debug output
az network bastion ssh --name testcjo-bastion-dev --resource-group cjotestev2 --target-resource-id /subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Compute/virtualMachines/testcjo-vm-dev --auth-type "ssh-key" --ssh-key ~/.ssh/id_rsa.dev-deploy-vm --username vmadmin --debug 2>&1 | tee /tmp/az_network_ssh.debug.log
DEBUG: cli.knack.cli: Command arguments: ['network', 'bastion', 'ssh', '--name', 'testcjo-bastion-dev', '--resource-group', 'cjotestev2', '--target-resource-id', '/subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Compute/virtualMachines/testcjo-vm-dev', '--auth-type', 'ssh-key', '--ssh-key', '/home/cjochsjr/.ssh/id_rsa.dev-deploy-vm', '--username', 'vmadmin', '--debug']
DEBUG: cli.knack.cli: __init__ debug log:
Cannot enable color.
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DEBUG: cli.knack.cli: Event: CommandInvoker.OnPreCommandTableCreate []
DEBUG: cli.azure.cli.core: Modules found from index for 'network': ['azure.cli.command_modules.network', 'azure.cli.command_modules.privatedns', 'azext_bastion']
DEBUG: cli.azure.cli.core: Loading command modules:
DEBUG: cli.azure.cli.core: Name Load Time Groups Commands
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DEBUG: cli.azure.cli.core: privatedns 0.017 14 60
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DEBUG: cli.azure.cli.core: These extensions are not installed and will be skipped: ['azext_ai_examples', 'azext_next']
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DEBUG: cli.azure.cli.core: bastion 0.007 2 9 /home/cjochsjr/.azure/cliextensions/bastion
DEBUG: cli.azure.cli.core: Total (1) 0.007 2 9
DEBUG: cli.azure.cli.core: Loaded 135 groups, 439 commands.
DEBUG: cli.azure.cli.core: Found a match in the command table.
DEBUG: cli.azure.cli.core: Raw command : network bastion ssh
DEBUG: cli.azure.cli.core: Command table: network bastion ssh
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INFO: az_command_data_logger: command args: network bastion ssh --name {} --resource-group {} --target-resource-id {} --auth-type {} --ssh-key {} --username {} --debug
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INFO: az_command_data_logger: extension name: bastion
INFO: az_command_data_logger: extension version: 1.4.2
/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py:107: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
from pkg_resources import parse_version
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DEBUG: msal.application: Broker enabled? None
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DEBUG: cli.azure.cli.core.sdk.policies: {"name":"testcjo-bastion-dev","id":"/subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Network/bastionHosts/testcjo-bastion-dev","etag":"W/\"26ac8c1c-113f-42f9-b05d-ec03bd3c3559\"","type":"Microsoft.Network/bastionHosts","location":"westus2","tags":{"environment":"dev","managedBy":"Bicep","cloud":"AzureCloud","createdDate":"2026-02-24 15:49:40Z"},"properties":{"provisioningState":"Succeeded","dnsName":"bst-0cdd5be2-64db-46d8-89f1-29529419f17b.bastion.azure.com","scaleUnits":2,"publicUri":"/subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Network/publicIPAddresses/testcjo-pip-bastion-dev","ipConfigurations":[{"name":"IpConf","id":"/subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Network/bastionHosts/testcjo-bastion-dev/bastionHostIpConfigurations/IpConf","etag":"W/\"26ac8c1c-113f-42f9-b05d-ec03bd3c3559\"","type":"Microsoft.Network/bastionHosts/bastionHostIpConfigurations","properties":{"provisioningState":"Succeeded","privateIPAllocationMethod":"Dynamic","publicIPAddress":{"id":"/subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Network/publicIPAddresses/testcjo-pip-bastion-dev"},"subnet":{"id":"/subscriptions/fe96f029-0423-4766-93fb-bf2066356770/resourceGroups/cjotestev2/providers/Microsoft.Network/virtualNetworks/testcjo-vnet-dev/subnets/AzureBastionSubnet"}}}]},"sku":{"name":"Standard"}}
DEBUG: cli.azure.cli.core.azclierror: Traceback (most recent call last):
File "/opt/az/lib/python3.13/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 669, in execute
raise ex
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 737, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 706, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 336, in __call__
return self.handler(*args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
return op(**command_args)
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 183, in ssh_bastion_host
if not _is_nativeclient_enabled(bastion):
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 395, in _is_nativeclient_enabled
return bastion['enableTunneling']
~~~~~~~^^^^^^^^^^^^^^^^^^^
KeyError: 'enableTunneling'
ERROR: cli.azure.cli.core.azclierror: The command failed with an unexpected error. Here is the traceback:
ERROR: az_command_data_logger: The command failed with an unexpected error. Here is the traceback:
ERROR: cli.azure.cli.core.azclierror: 'enableTunneling'
Traceback (most recent call last):
File "/opt/az/lib/python3.13/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 669, in execute
raise ex
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 737, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 706, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 336, in __call__
return self.handler(*args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
return op(**command_args)
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 183, in ssh_bastion_host
if not _is_nativeclient_enabled(bastion):
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 395, in _is_nativeclient_enabled
return bastion['enableTunneling']
~~~~~~~^^^^^^^^^^^^^^^^^^^
KeyError: 'enableTunneling'
ERROR: az_command_data_logger: 'enableTunneling'
Traceback (most recent call last):
File "/opt/az/lib/python3.13/site-packages/knack/cli.py", line 233, in invoke
cmd_result = self.invocation.execute(args)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 669, in execute
raise ex
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 737, in _run_jobs_serially
results.append(self._run_job(expanded_arg, cmd_copy))
~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 706, in _run_job
result = cmd_copy(params)
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/__init__.py", line 336, in __call__
return self.handler(*args, **kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/opt/az/lib/python3.13/site-packages/azure/cli/core/commands/command_operation.py", line 120, in handler
return op(**command_args)
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 183, in ssh_bastion_host
if not _is_nativeclient_enabled(bastion):
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
File "/home/cjochsjr/.azure/cliextensions/bastion/azext_bastion/custom.py", line 395, in _is_nativeclient_enabled
return bastion['enableTunneling']
~~~~~~~^^^^^^^^^^^^^^^^^^^
KeyError: 'enableTunneling'
To check existing issues, please visit: https://github.com/Azure/azure-cli/issues
DEBUG: cli.knack.cli: Event: Cli.PostExecute [<function AzCliLogging.deinit_cmd_metadata_logging at 0x75c99bf67a60>]
INFO: az_command_data_logger: exit code: 1
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INFO: telemetry.process: Return from creating process 3978672
INFO: telemetry.main: Finish creating telemetry upload process.
Expected behavior
I expected the ssh command to fail gracefully due to not setting up Native Client.
Environment Summary
azure-cli 2.83.0
core 2.83.0
telemetry 1.1.0
Extensions:
azure-devops 1.0.2
bastion 1.4.2
ssh 2.0.6
Dependencies:
msal 1.35.0b1
azure-mgmt-resource 23.3.0
Python location '/opt/az/bin/python3'
Config directory '/home/cjochsjr/.azure'
Extensions directory '/home/cjochsjr/.azure/cliextensions'
Python (Linux) 3.13.11 (main, Jan 27 2026, 07:21:51) [GCC 11.4.0]
Legal docs and information: aka.ms/AzureCliLegal
Your CLI is up-to-date.
Additional context
This may only occur after deploying a bastion instance (Standard SKU) using automation (I used bicep)