VAMI scheduled backup on vCenter Server failing with error: "Error in method invocation 'NoneType' object is not subscriptable"

Products

• VMware vCenter Server

Issue/Introduction

• SFTP backup configuration failed with error "Error in method invocation 'NoneType' object is not subscriptable"
• /var/log/vmware/applmgmt/applmgmt.log
  
  YYYY-MM-DDTHH:MM:SSZ PM CET [10583]DEBUG:plugins.SftpStorageIOLib:Passwordless ssh tunnel is not working, falling back to CURL
  YYYY-MM-DDTHH:MM:SSZ PM CET [10583]ERROR:plugins.FtpStorageIOLib:sftp cmd failed. RC: 5, Err: curl: (5) Could not resolve proxy: <Proxy Server Name>.internal
  , Cmd: ['/usr/bin/curl', '--fail', '-u', 'sftpuser:****', '--connect-timeout', '120', '--ssl-reqd', '-k', '--proxy', 'http://<Proxy Server Name>.internal:8080/', '--proxytunnel', '--silent', '--show-error', '--list-only', 'sftp:<IP of SFTP server>
  3/backup/']
  YYYY-MM-DDTHH:MM:SSZ PM CET [10583]ERROR:vmware.vapi.provider.local:Error in invoking com.vmware.appliance.recovery.backup.schedules in create - 'NoneType' object is not subscriptable
  Traceback (most recent call last):
    File "/usr/lib/applmgmt/backup_restore/py/vmware/appliance/backup_restore/schedule_impl.py", line 120, in _validateRemoteLocation
      dispatch.storageIO.dir_exists()
    File "/usr/lib/applmgmt/backup_restore/py/vmware/appliance/backup_restore/plugins/FtpStorageIOLib.py", line 222, in dir_exists
      self._process_curl_output(cmd_res)
    File "/usr/lib/applmgmt/backup_restore/py/vmware/appliance/backup_restore/plugins/FtpStorageIOLib.py", line 152, in _process_curl_output
      raise PluginError(
  plugins.StorageIOErrorsLib.PluginError: Plugin error occurred. ErrCode: 10, Args: ()
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/usr/lib/applmgmt/vapi/lib/vapi_runtime-2.100.0-py2.py3-none-any.whl/vmware/vapi/provider/local.py", line 277, in invoke
      method_result = self._invoke_int(
    File "/usr/lib/applmgmt/vapi/lib/vapi_runtime-2.100.0-py2.py3-none-any.whl/vmware/vapi/provider/local.py", line 249, in _invoke_int
      method_result = iface.invoke(ctx, method_id, input_value)
    File "/usr/lib/applmgmt/vapi/lib/vapi_runtime-2.100.0-py2.py3-none-any.whl/vmware/vapi/bindings/skeleton.py", line 371, in invoke
      meth_output = method(**meth_args)
    File "/usr/lib/applmgmt/base/py/vmware/vherd/base/thread_utils.py", line 43, in wrapper
      return sync_call_from_thread(func, *args, **kw)
    File "/usr/lib/applmgmt/base/py/vmware/vherd/base/thread_utils.py", line 13, in sync_call_from_thread
      return threads.blockingCallFromThread(reactor, func, *args, **kw)
    File "/usr/lib/python3.10/site-packages/twisted/internet/threads.py", line 122, in blockingCallFromThread
      result.raiseException()
    File "/usr/lib/python3.10/site-packages/twisted/python/failure.py", line 488, in raiseException
      raise self.value.with_traceback(self.tb)
  TypeError: 'NoneType' object is not subscriptable

Environment

VMware vCenter Server 8.x

Cause

This issue is due to an proxy configured on vCenter which is not resolving and failed to connect to SFTP backup server.

Resolution

• Once removed the proxy which is not configured correctly and backup succeeded through VAMI.  
• If you need to use the proxy, configure it properly on vCenter.