How to Fix Failed to Connect a Hyper-V Standalone to Veeam Backup

Invalid Credentials Error Adding a Hyper-V Host

When attempting to add a Hyper-V host to Veeam Backup & Replication using a local (non-domain) user account, the following error occurs:

Failed to connect to host
Access denied or timeout expired. 
Check if you have local administrator privileges on computer
Possible reasons:
1. Invalid credentials.
2. Specified host is not a Hyper-V server.

Solutions

1️⃣ Login into the Hyper-V host then open Registry Editor.

2️⃣ Navigate to the following location then create a new DWORD value.

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System

3️⃣ Enter the name LocalAccountTokenFilterPolicy then double click on it and set the value data is 1.

Or you can create a DWORD value using PowerShell, let run below command in PowerShell Admin.

reg add HKLM\Software\Microsoft\Windows\CurrentVersion\policies\system /v LocalAccountTokenFilterPolicy /t Reg_DWORD /d 1

4️⃣ Finally, go back to the Veeam Backup server then add the Hyper-V host again.