I have a ESXi v6.5 running on IBM M2. The ESXi is managed by vCenter V6.7. I tried to patch the ESXi with Update Manager. Update manager always fails with error, The host returns esxupdate error codes: -1. Check the Update Manager log files and esxupdate log files for more details.
The update manager and vCenter are installed on Windows 2012 Server. Please advise how I can proceed to troubleshoot and fix the issue.