switch tag {
	case xsftp.AcceptNetworkError:
		sftpLogOnceIf(context.Background(), err, "accept-limit-sftp")
	case xsftp.AcceptChannelError:
		sftpLogOnceIf(context.Background(), err, "accept-channel-sftp")
	case xsftp.SSHKeyExchangeError:
		sftpLogOnceIf(context.Background(), err, "key-exchange-sftp")
	default:
		sftpLogOnceIf(context.Background(), err, "unknown-error-sftp")
	}
}