What you’re seeing
- Moving a VM between two non-clustered Hyper-V hosts fails with Event 21024 or an authentication error.
- The error appears when the move is started from a remote management console instead of on the host.
- Messages mention that the operation failed because of credentials or Kerberos.
- Large disk copies start but abort partway with a migration failure.
Common causes
Every environment is different, but these are the causes our engineers find most often:
- CredSSP authentication requires the migration to be started while logged directly into the source host.
- Kerberos constrained delegation is not configured between the two hosts.
- The hosts are not in the same Active Directory domain or trust each other incorrectly.
- Live migration is not enabled, or the allowed networks exclude the path between the hosts.
- Firewall rules block the ports needed for migration and storage transfer.
Why it matters
Shared-nothing migration is how many small businesses move VMs to new hardware without clusters or shared storage. When it fails, moving servers means shutting them down, copying disks by hand and accepting downtime. Hardware replacement projects stall, and the old server may stay in service past its prime, adding failure risk.
How AskTechGurus fixes it
Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.
Tell us what’s happening
Submit a ticket in about two minutes. Paste the error, describe what changed, and pick your tier. No charge to submit.
A certified engineer diagnoses it
A vetted, US-based systems engineer claims your ticket, usually within minutes during business hours, and investigates over a secure remote session you can watch and end at any time.
Fixed and verified with you
The engineer resolves the root cause and confirms with you that it’s working. You don’t just get a workaround, and you get a plain-English summary of what was wrong.
Pay only when it’s resolved
Fixed price from $99, invoiced only after you approve the fix. If it isn’t resolved, you don’t pay.
Frequently asked questions
Can we move the VM without downtime?
Usually yes, once authentication and networking between the hosts are set up correctly. The alternative is an export and import, which requires the VM to be offline.
How do you help with a move like this?
Our certified US engineers work in a remote secure session to get the hosts talking properly, often in a single session, and you pay only when it is resolved.