unable to connect to the Windows admin center

Hi,
I'm sorry to hear that you are experiencing this issue. Please try these steps to resolve your issue:

1. Ensure that the computer name or IP address you're trying to connect to is correct and that the server is operational. Basically, ensure its on.
2. Verify that the target computer is on the same network and is reachable (you can use ping command for this purpose). Basically, make sue its reachable and you can ping it.
3. Check the firewall settings on both the local and remote machines to ensure that WinRM is allowed. The default configuration of Windows Firewall restricts WinRM to computers within the same local subnet. Maybe its being blocked by the firewall or group policy.
4. On the remote machine, WinRM needs to be properly configured and running. You can use the winrm quickconfig command on the remote machine to ensure it's set up correctly. Also, during installation, don't select "WinRM over HTTPS" if you have not configured for this.
5. If you're in a domain environment, ensure that Group Policies are not preventing remote management.
6. Make sure that the necessary services for remote management are running on the remote server. This includes the Remote Procedure Call (RPC) service, the Windows Management Instrumentation (WMI) service, and the WinRM service itself.
7. If you're trying to connect to a server in another domain or a workgroup, you may need to add the server's name or IP address to the list of TrustedHosts on your client machine in local machines and groups.

Please let me know if following these steps resolves your issue.

Kind regards,
Rebecca.