I, like many have recently tried to update my vCSA 6.0 to 6.5. Part of this work involves running the migration assistant on the existing Windows Server running VMware Update Manager.

I had a failure recently and there was nothing noting how to fix it. The issue was trying to run the Migration assistant, entering in the administrator@vsphere.local password and getting a big fail message.

Error message:

Error: A problem occurred during authentication to the legacy vCenter Server using the provided credentials. Resolution make sure the vCenter Server is up and running. Verify you have entered the correct credentials.

Now, before I started my upgrade (blogs to follow) I checked I had all my passwords and that they were correct. I went as far as logging in to everything to test this, so I know the password was correct.

VUM was working through console and services were there, so what was the issue?

Then I remembered that a while ago I applied SSL Certificates to the vCSA for some automation testing!

The fix:

1) Login to the VUM server

2) Navigate to C:\Program Files (x86)\VMware\Infrastructure\Update Manager (or install path of your environment)

3) Load the VMwareUpdateManagerUtility.exe and login with SSO Admin (it worked!)

4) Navigate to “re-register vCenter Server” and enter in the details again.


5) Restart the VMware Update Server Service when prompted.

6) Retry the Migration Assistant


7) Success!

I couldn’t find any articles detailing the fix when I encountered this issue, so hopefully this will help someone in need of a quick fix! 🙂

Enjoy!