The Server Manager WinRM plug-in might be corrupted or missing on W2K12R2

It appears that WinRM/WSMAN configuration has to be reset to default values. Thanks to this post I have found where does it reside. So copying HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN registry settings from the fresh Win 2012 R2 install to the problem machine eliminates this error.

Just for the case these settings as of 17 Oct 2016 from fully updated fresh install Win 2012 R2 Standard (English) are below:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN]
"StackVersion"="2.0"

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\AutoRestartList]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\CertMapping]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Client]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Listener]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Listener\*+HTTP]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin\Event Forwarding Plugin]
"ConfigXML"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin\Microsoft.PowerShell]
"ConfigXML"="                                                                                                                                                                                                                  "

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin\Microsoft.PowerShell.Workflow]
"ConfigXML"="                                                                                                                                                                                                                                                                                   "

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin\Microsoft.PowerShell32]
"ConfigXML"="                                                                                                                                                                                                                                                                                      "

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin\Microsoft.Windows.ServerManagerWorkflows]
"ConfigXML"="                                                                                                                                                                                                                                                                                                                                                                                                                       "

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin\SEL Plugin]
"ConfigXML"="        "

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Plugin\WMI Provider]
"ConfigXML"=""

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\SafeClientList]
"WSManSafeClientList"=hex:00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,01

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\Service]
"allow_remote_requests"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\WinRS]

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WSMAN\WinRS\CustomRemoteShell]

The Link below helped solved the problem without making edit to my registry http://www.lukebrowning.com/sysadmin/windows/windows-server-2012-winrm-corrupt-or-missing/

In case you have multiple network interfaces (IP addresses) on your server - the key part from the @jide jimoh's blog post is:

netsh http add iplisten 127.0.0.1

Make sure you run this command with elevated permissions.

All credits to jide jimoh.

And no need to mess with the registry.