I've been trying for two weeks to get one VM to backup with Thinware.
Do you think enabling Jumbo Frames between VM and iSCSI SAN will fix this issue?
I do have a thick 80Gb provisioned VM saving it to a 400Gb local drive on the 64-bit backup server that has Thinware installed. I have compression set to none b/c I have a standard license. Just wonder if anyone else has been able to resolve this issue without spending an arm and leg.
Thanks.

Thinware(R) vBackup(R)
Version: 4.0.0.2708 (Version 4.0)
Copyright (c) 2009-2014 Thinware, Inc. All rights reserved.
Visit us at: www.vbackup.com
________________________________________________________________________________

Process Started: 5/23/2014 4:28:10 PM

Application Settings:
- SMTP Server = *********.com:25
- SMTP Username = *********
- SMTP Password = *********
- SMTP From Address = *********
- Notification Recipients = *********
- VMware Virtual Disk Development Kit Install Path = C:\Program Files (x86)\
VMware\VMware Virtual D
isk Development Kit\

Execution Arguments:
- Virtual Machine = ANTI-VIRUS
- Server = 192.168.0.51:22
- Server Username = *********
- Server Password = *********
- Job = BKUP Anti-Virus
- Job Type = Backup-Image-SSH
- Backup Root = G:\
- Disk Exclusion = None
- Backups To Keep = 3
- Quiesce Guest File System = True
- Create Snapshot Task Timeout = 15
- Remove Snapshot Task Timeout = 15
- Encrypt Temporary Password File = False
- Compression Level = None
- Maximum Log Size = 1024
- Backup Type = Image-Full
- Debug = after

Validating settings...

Attempting to ping SMTP server... SMTP server responded to ping.

Attempting to ping server... Server responded to ping.

Establishing connection to server...

One or more certificate problems encountered while establishing connection
to https://192.168.0.51/sdk:

* A certification chain processed correctly, but terminated in a root cer
tificate which isn't trusted by the trust provider.
* The certificate's CN name does not match the passed value.

Server Platform: VMware ESXi 5.1.0 799733

Hypervisor property for 192.168.0.51 updated.

Verifying virtual machine exists on server... Virtual machine located successfully.

Virtual Machine Guest OS: Microsoft Windows Server 2012 (64-bit)

GuestOS property for ANTI-VIRUS updated.

Validating license... License validated.

License:
- Type: Perpetual
- Status: Active
- Edition in Use: Standard

Checking for licensing issues... No licensing issues found.

Checking for feature usage issues... No feature usage issues found.

E-mail notification is not supported with Standard Edition licenses, e-mail notification disabled.

Backup Folder: G:\\ANTI-VIRUS

Backup: 140523_162842

Log File: G:\\ANTI-VIRUS\vBackup.log

Executing backup job...

Checking for existing temporary snapshot(s)... No temporary snapshots found.

Creating folder for backup data... Done.

Retrieving virtual machine ID... Virtual Machine ID: 13

Creating temporary snapshot... Done.

Obtaining reference to temporary snapshot... Done.

Temporary Snapshot: vBackup-TMP-140523_162842

Copying virtual machine configuration file... Done.

VMware Virtual Disk Development Kit: VMware Virtual Disk Manager - build 774844

Copying virtual machine virtual disk file(s)...

Hard disk 1: [01Drobo500GB] ANTI-VIRUS/ANTI-VIRUS-000002.vmdk
Creating disk 'G:\\ANTI-VIRUS\140523_162842\ANTI-VIRUS-000002.vmdk'
Convert: 0% done.
VMware Virtual Disk Manager response for Hard disk 1: [01Drobo500GB] ANTI-VIRUS/
ANTI-VIRUS-000002.vmdk:
SSL_VerifyCbHelper: Certificate verification is disabled, so connection will proceed despite the error
[NFC ERROR] NfcNetTcpRead: bRead: -1
[NFC ERROR] NfcNet_Recv: requested 261832, recevied only 180224 bytes
[NFC ERROR] NfcFile_RecvMessage: data recv failed. retval = 3, expected 261832
[NFC ERROR] NFC_NETWORK_ERROR
Failed to convert disk: Operation completes asynchronously (0x300004650).

CRITICAL: Unable to verify successful transfer of virtual machine virtual disk file G:\\ANTI-VIRUS\140523_162842\ANTI-VIRUS-000002.vmdk.

CRITICAL: Unable to complete backup.

Retrieving temporary snapshot ID... Snapshot ID: 13

Removing temporary snapshot... Connection to server timed out during backup process. Connection must be reestablished in order to remove temporary snapshot (this is not an error).

Attempting to ping server... Server responded to ping.

Attempting to reestablish connection to server... Connection reestablished.

Attempting to validate server connection... Connection validated.

Continuing with removal of temporary snapshot... Done.

Cleaning up after job failure... Done.

Process Complete: 5/23/2014 6:26:30 PM

Elapsed Time: 1 hour, 58 minutes and 20 seconds
________________________________________________________________________________

Critical: Unable to complete backup. Please review task history on host, log
file and information above for specific errors and run vBackup using
the '-help' switch to display syntax and usage information if needed
(e.g. at a command prompt type 'vbackup -help' and press enter).

Press any key to exit.