Failed to backup virtual server
Error code 19:857
description: error downloading virtual machine config file

only 2 virtual servers failed to be backed up, all other virtual servers backup work properly
Failed to backup virtual server
Error code 19:857
description: error downloading virtual machine config file

only 2 virtual servers failed to be backed up, all other virtual servers backup work properly
Best answer by Mostafa Amin
The Issue was in the ESXI.
The management agent on the ESX host needed to be restarted.
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