Why connection to SMB share cannot be established?

Issue:

MetaDefender Storage Security connection with SMB fails with error:

smbprotocol.exceptions.SMBOSError: [Error 0] [NtStatus 0xc00000c9] Unknown NtStatus error returned 'STATUS_NETWORK_NAME_DELETED': '\\{IP_HOSTNAME}ftp\CN

Description

• NtStatus 0xc00000c9 corresponds to STATUS_NETWORK_NAME_DELETED.
• This error typically occurs when the network share or resource you are trying to access has been removed, deleted, or is temporarily unavailable.
• It can also happen if the SMB session has become stale (e.g., the server closed the connection due to timeout, network issues, or a manual server-side operation).

Possible Causes:

• The network share \\[IP_HOSTNAME]\ftp\CN was deleted or unshared on the server. The SMB server might be up but the whole path might be unshared.
• The server at [IP_HOSTNAME] rebooted, crashed, or restarted its SMB service.
• There is a network connectivity issue between our SMB service and customer’s SMB server.
• Permissions on the share changed, making it inaccessible.