Error: "Failed to register VMware HTTP Reverse Proxy service with SCA" upgrading vCenter Server 6.7

Products

• VMware vCenter Server

Issue/Introduction

• vCenter Server 6.7 on Windows Upgrade Fails During Firstboot.
• You see the error:
  
  VMware HTTP Reverse Proxy Firstboot Failed - "Failed to register VMware HTTP Reverse Proxy service with SCA"
   
• firstbootStatus.json contains entries similar to:
  
  "failedSteps": "rhttpproxy_firstboot"
   
• rhttpproxy_firstboot.py_####_stdout.log file contains entries similar to:
  
  Service: vswaLandingPage does not exist.
  Registering rhttpproxy with SCA
  rhttpproxy firstboot failed​
  
  Note: 

vCenter Server on Windows - Firstboot logs are located in the VMware-VCS-logs-<year><month><day><hour><minute><second>.zip/vcs_logs/uninstall directory or the VMware-VCS-logs-<year><month><day><hour><minute><second>/vcs_logs/uninstall/<vCenter Hostname><year><month><day><hour><minute><second>.zip/ProgramData/VMware/vCenterServer/logs/firstboot directory.

Environment

VMware vCenter Server 6.7.x

Cause

This issue occurs when the vmware-sca component is not properly uninstalled during a rollback.

Resolution

Identify the uninstall ID and then remove the vmware-sca.msi.

To Identify the uninstall ID:

1. Click Start > Run or press Windows + R key.
2. Type regedit and click OK.
3. Navigate to:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall.

4. Search for VMware Service Control Agent.
5. Identify the UninstallString value.

To uninstall:

1. Open an Administrative command prompt.
2. Run the following command:

MsiExec.exe /X {UninstallString from step 5 above}
For example: MsiExec.exe /X {5266FAC2-14EC-4BE4-AC61-BB072C11A0E3}

3. Perform the upgrade to vCenter Sever 6.7.

Additional Information

• To learn more about firstboot issues see, Firstboot Failed during Install, Deployment, Upgrade, or Migration in vCenter Server and vCenter Server Appliance 6.7​.
• To collect a log bundle or review log files for a vCenter Server on Windows install or upgrade issues, see Triaging a vCenter Server 6.0 installation or upgrade failure