PowerShell - 원격 Invoke-Command 실행 시 "WinRM cannot complete the operation" 오류 발생

PS C:\WINDOWS\system32> invoke-command -ComputerName TESTPC {ipconfig /all}
[TESTPC] Connecting to remote server TESTPC failed with the following error message : WinRM cannot complete the operation. Verify that the specified computer name is valid, that the computer is accessible over the network, and that a firewall exception for the WinRM service is enabled and allows access from this computer. By default, the WinRM firewall exception for public profiles limits access to remote computers within the same local subnet. For more information, see the about_Remote_Troubleshooting Help topic.
+ CategoryInfo : OpenError: (TESTPC:String) [], PSRemotingTransportException
+ FullyQualifiedErrorId : WinRMOperationTimeout,PSSessionStateBroken

PowerShell로 원격 프로세스(EXE, BAT) 실행하는 방법
; https://www.sysnet.pe.kr/2/0/11450

c:\temp> winrm quickconfig
WinRM already is set up to receive requests on this machine.
WinRM is not set up to allow remote access to this machine for management.
The following changes must be made:

Create a WinRM listener on HTTP://* to accept WS-Man requests to any IP on this machine.
Enable the WinRM firewall exception.

Make these changes [y/n]? y

WinRM has been updated for remote management.

Created a WinRM listener on HTTP://* to accept WS-Man requests to any IP on this machine.
WinRM firewall exception enabled.