Using MMC, I'm attempting to remotely manage the Windows Defender Firewall on our Hyper-V Server 2019 instance (no GUI, CLI only). The NetBIOS name is SERVER1.
The Windows Defender Firewall Remote Management rules are enabled:
Name : RemoteFwAdmin-In-TCP
DisplayName : Windows Defender Firewall Remote Management (RPC)
Description : Inbound rule for the Windows Defender Firewall to be remotely managed via RPC/TCP.
DisplayGroup : Windows Defender Firewall Remote Management
Group : @FirewallAPI.dll,-30002
Enabled : True
Profile : Any
Platform : {}
Direction : Inbound
Action : Allow
EdgeTraversalPolicy : Block
LooseSourceMapping : False
LocalOnlyMapping : False
Owner :
PrimaryStatus : OK
Status : The rule was parsed successfully from the store. (65536)
EnforcementStatus : NotApplicable
PolicyStoreSource : PersistentStore
PolicyStoreSourceType : Local
Name : RemoteFwAdmin-RPCSS-In-TCP
DisplayName : Windows Defender Firewall Remote Management (RPC-EPMAP)
Description : Inbound rule for the RPCSS service to allow RPC/TCP traffic for the Windows Defender Firewall.
DisplayGroup : Windows Defender Firewall Remote Management
Group : @FirewallAPI.dll,-30002
Enabled : True
Profile : Any
Platform : {}
Direction : Inbound
Action : Allow
EdgeTraversalPolicy : Block
LooseSourceMapping : False
LocalOnlyMapping : False
Owner :
PrimaryStatus : OK
Status : The rule was parsed successfully from the store. (65536)
EnforcementStatus : NotApplicable
PolicyStoreSource : PersistentStore
PolicyStoreSourceType : Local
However, when I click the Inbound Rules node, MMC crashes:
Not that it helps much, but here's the stack trace info:
FX:{b05566ac-fe9c-4368-be02-7a4cbb7cbe11}
Object reference not set to an instance of an object.
System.NullReferenceException
at Microsoft.WindowsFirewall.SnapIn.Wrappers.FirewallRules.Reload(String[] ruleIdFilter)
at Microsoft.WindowsFirewall.SnapIn.ExceptionsListView.Refresh()
at Microsoft.WindowsFirewall.SnapIn.NativeMethods.EnhancedMmcListView`1.ForceRefresh()
at Microsoft.WindowsFirewall.SnapIn.NativeMethods.EnhancedMmcListView`1.OnShow()
at Microsoft.ManagementConsole.View.ProcessNotification(Notification notification)
at Microsoft.ManagementConsole.ViewMessageClient.ProcessNotification(Notification notification)
at Microsoft.ManagementConsole.Internal.IMessageClient.ProcessNotification(Notification notification)
at Microsoft.ManagementConsole.Executive.SnapInNotificationOperation.ProcessNotification()
at Microsoft.ManagementConsole.Executive.Operation.OnThreadTransfer(SimpleOperationCallback callback)
...and here's the Application event log entry:
As expected, the Security and Maintenance control panel is useless for this.
When I try this from another machine on the network, MMC doesn't crash—but the Inbound/Outbound rule lists stay empty. No relevant event log entries are produced there.
How can I track this down and fix it so I can remotely manage the server's firewall?
--UPDATE--
I just now got the MMC crash on the other machine.
