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This error usually occurs if the default website is not available or was deleted.

To resolve the issue:

  1. Open services.msc.
  2. Check if IIS Admin Service and World Wide Web Publishing service are running.
  3. If they are running, check if Default Site is present in the IIS Manager (inetmgr):
    • If the Default Site is not present, create a new Default Site.
    • If the Default Site is present, make sure that it is running.
  1. Open IIS Manager.
  2. In the Connections tree on the left side, right-click Sites node under your machine.
  3. Click Add Website.
  4. Enter "Default Web Site" as a Site name.
  5. Set Application pool back to DefaultAppPool!.
  6. Set Physical path to %SystemDrive%\inetpub\wwwroot.
  7. Leave Binding and everything else as is:

    Type: HTTP
    IP address: All Unassigned
    Port: 80

  1. Stop Apex One Master Service.
  2. Clean up the files in C:\Users\<User>\AppData\Local\Temp.
  3. Open services.msc with Administrator privilege.
  4. Check whether ApexOne_Master_Setup_Service exists or not.

    If it exists, please remove the service.

  5. Run CMD as administrator:

    sc delete ApexOne_Master_Setup_Service

  6. Run Apex One installation setup.
  7. Check if the issue still persists.