V2V Migration Error

saikumarcst · Mon Sep 15, 2025 7:07 am

I am trying to use StarWind V2V Converter to migrate a VM from VMware ESXi 8.0.3 to Microsoft Hyper-V. The converter is able to connect to my ESXi host, but when it attempts to read the VMDK file, it fails with the error ESXVmdk::ParseFile: m_VixDiskLib_Open is fail - 18000, Cannot connect to the host. In the logs, I also see repeated SOAP connection errors such as "End of file or no input: message transfer interrupted" and failures retrieving VM lists and datastore information. I confirmed that the required ports (902 and 443) are open and that credentials are correct, so it looks like the converter cannot properly communicate with ESXi at the disk level.

I cannot find any VDDK libraries too, is it because of this why it is failing?

Mon Sep 15, 2025 7:11 am

Welcome to StarWind Forum.

I cannot find any VDDK libraries too, is it because of this why it is failing?

Correct. Try converting the file locally and copying it to the destination. Recreate the VM using the VM disks afterward.

saikumarcst · Mon Sep 15, 2025 7:13 am

Even when i tried to convert it locally, it was showing me the same errors. it is not able to connect properly to my ESXi host. What should i do?

Mon Sep 15, 2025 7:30 am

Copy VMDK to the destination -> convert it in-place.
You can also try reinstalling the software.

saikumarcst · Mon Sep 15, 2025 7:33 am

But what would I need to do if i want a direct conversion from ESXi to Hyper-V since I have a lot of VM's to convert for my organization?

Mon Sep 15, 2025 7:46 am

The library is missing, or it can't connect to ESXi.
Could you please try a different VMDK?
Can you browse the VMDKs and VMs with the UI when connecting?
Please make sure that 443 and 80 ports are also open too. Check out this thread for more details viewtopic.php?f=15&t=6745&p=37495&hilit ... +80#p37495

saikumarcst · Mon Sep 15, 2025 8:59 am

I did try to create another VM on ESXi and try to connect it, but the error keeps on coming. I am able to connect to my ESXi and browse through my VM's but when I click convert, it gives me a fail message.

Started
Opening image file [datastore1] Test VM/Test VM.vmdk
Error opening image
Cannot connect to host
Conversion failed

Mon Sep 15, 2025 9:06 am

Hi,

Please try copying the VMDK to the destination machine and converting the file there.
Alternatively, you can try converting the VM to the OVF template and deploying it in place.

saikumarcst · Mon Sep 15, 2025 9:07 am

Is there any way I could resolve this issue so that I can directly convert from ESXi to Hyper-V because I have a lot of VM's ?

Mon Sep 15, 2025 9:26 am

The issue does not seem to be related to the converter.
There is a communication problem, or the Library is missing. Please try running the conversion from a different machine or use a different version https://drive.google.com/file/d/1hDP4gl ... Ea_5p/view