Enabling SSO for Windows Admin Center (WAC)

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1) Trust WAC by supported Browsers

Supported Browsers: Chrome, Edge....

Add  the WAC FQDN <https://Hostname Windows Admin Center> to the "Trusted Local Intranet Zone" under Internet Properties.

Click Start and type "inetcpl.cpl" to open the required GUI.

2) Setting Kerberos Contrained Delegation

Var1:

# Variant 1:
##########################################

# Add and import AD PowerShell
Add-WindowsFeature RSAT-AD-PowerShell
Import-Module ActiveDirectory

# Host name of Windows Admin Center
$wac = "<Hostname Windows Admin Center>"

# Server names and Cluster names that you want to manage with Windows Admin Center in your domain
# $servers = "<Server1>", "<Server2>", "<Server3>", "<CLUSTER1>"

# Get the identity object of Windows Admin Center (WAC)
$wacobject = Get-ADComputer -Identity $WAC

# Set the resource-based kerberos constrained delegation for each node
foreach ($server in $servers){
    $computerObject = Get-ADComputer -Identity $server
    Set-ADComputer -Identity $computerObject -PrincipalsAllowedToDelegateToAccount $wacobject -verbose
}

#  Clearing KDC Cache
Invoke-Command -ComputerName $servers -ScriptBlock {
klist purge -li 0x3e7
}

Var2:

# Variant 2
##########################################
$GatewayServerName="<Hostname Windows Admin Center>"
#Configure Resource-Based constrained delegation
$gatewayObject = Get-ADComputer -Identity $GatewayServerName
$computers = (Get-ADComputer -Filter {OperatingSystem -eq "Azure Stack HCI"}).Name

foreach ($computer in $computers){
    $computerObject = Get-ADComputer -Identity $computer
    Set-ADComputer -Identity $computerObject -PrincipalsAllowedToDelegateToAccount $gatewayObject
}

#  Clearing KDC Cache
Invoke-Command -ComputerName $servers -ScriptBlock {
klist purge -li 0x3e7
}

Var3:

# Variant 3
##########################################
$GatewayServerName="<Hostname Windows Admin Center>"

#Configure Resource-Based constrained delegation
$gatewayObject = Get-ADComputer -Identity $GatewayServerName
$computers = (Get-ADComputer -Filter 'Description -like "Node" -or Description -like "Cluster"').Name

foreach ($computer in $computers){
    $computerObject = Get-ADComputer -Identity $computer
    Set-ADComputer -Identity $computerObject -PrincipalsAllowedToDelegateToAccount $gatewayObject
}

# Check the value of the attribute directly
#foreach ($computer in $computers){
#$x = Get-ADComputer -Identity $computerObject -Properties msDS-AllowedToActOnBehalfOfOtherIdentity
#$x.'msDS-AllowedToActOnBehalfOfOtherIdentity'.Access
#}

foreach ($computer in $computers){
Set-ADComputer -Identity (Get-ADComputer -Identity $computer) -PrincipalsAllowedToDelegateToAccount $gatewayObject
}

foreach ($computer in $computers){
$computerObject = Get-ADComputer -Identity $computer
Write-Host $computerObject.Name":"
Get-ADComputer $computerObject.Name -Properties * | Format-List -Property *delegat*,msDS-AllowedToActOnBehalfOfOtherIdentity
}

#  Clearing KDC Cache
foreach ($computer in $computers){
Invoke-Command -ComputerName $computerObject.Name -ScriptBlock {
    klist purge -li 0x3e7
}
}

To Avoid WINRM - Problems in WAC:

# On each Cluster Node:
Disable-WsmanCredSSP -Role Server
Enable-WSManCredSSP -Role Server

# On the WAC-Server
Enable-WSManCredSSP -Role client -DelegateComputer <Cluster Node X Hostname>

# On the WAC-Server
# Disable Firewall for Remote Management
netsh advfirewall set allprofiles state off

Open gpedit.msc (on DC VM) and go to Local Computer Policy -> Computer Configuration -> Administrative Templates -> System -> Credentials Delegation.

• Enable Allow delegating fresh credentials and set value "wsman/<Cluster Node X Hostname>"                  
• Enable Allow delegating fresh credentials with NTLM-only server authentication and set value "wsman/<Cluster Node X HostName>"

Clone Settings from "Enable Allow delegating fresh credentials"

# On the WAC-Server
# Disable Firewall for Remote Management
netsh advfirewall set allprofiles state on

Test - Settings

# On the WAC - Server
$testSession= New-PSSession -ComputerName <Cluster Node X HostName> -Authentication Credssp -Credential (Get-Credential)

Remove-PSSession $testSession

References:

https://pitstop.manageengine.com/portal/en/kb/articles/enabling-credssp-authentication#How_to_enable_CredSSP_authentication

https://rdr-it.com/en/admin-center-configure-sso-with-a-gateway-configuration/