Error: "SSL certificate thumbprint verification failed for Migration Assistant" migrating vCenter Server Appliance 6.5

Products

• VMware vCenter Server

Issue/Introduction

• Pre-Upgrade Check result with SSL certificate thumbprint verification failed for Migration Assistant during vCenter Server Appliance 6.5 Migration
• In Pre-Upgrade Check result, you may see entries similar to:

Error:
SSL certificate thumbprint verification failed for Migration Assistant on address <fqdn>, port 9123. Expected thumbprint was <thumbprint#1>, got <thumbprint#2>.

Resolution:
Verify that the Migration Assistant SSL certificate thumbprint is correct and that MIgration Assistant is running on address  <fqdn>, port 9123

Environment

VMware vCenter Server Appliance 6.5.x

Cause

This issue occurs from a stale migration-assistant extension registration.

Resolution

Note: If there is a stale extension for the migration assistant in the source vCenter Server MOB, which starts with:

com.vmware.migration-assistant.vcIntegrity

Remove stale extension registration from MOB:

1. Use any browser to connect to https://<vcenter FQDN>/MOB.
2. Click on Content.
3. Locate the value "Extension Manager".
4. Click on the orphaned extension, similar to:

   "com.vmware.migration-assistant.vcIntegrity"

5. Copy the extension name without (") symbols.
6. Use "UnregisterExtension" .
7. Paste the extension from step #5 and click the "Invoke Method" to remove the extension.
8. Re-attempt migration.

Additional Information

Cannot remove or disable unwanted plug-ins from vCenter Server and vCenter Server Appliance.