View RDP Firewall Rule using PowerShell
If a Microsoft Windows system is running the
Microsoft Defender
Firewall,
firewall software that comes with Microsoft Windows systems, you can
check on whether connectivity is allowed on a particular
network
port from a
command-line
interface (CLI) using
PowerShell. You can determine whether the Windows Firewall is active on a
system from a command prompt
using the command netsh advfirewall show
currentprofile. If the value of "State" is "ON", then the Windows
Firewall is active on the system.
C:\>netsh advfirewall show currentprofile
Domain Profile Settings:
----------------------------------------------------------------------
State ON
Firewall Policy BlockInbound,AllowOutbound
LocalFirewallRules N/A (GPO-store only)
LocalConSecRules N/A (GPO-store only)
InboundUserNotification Enable
RemoteManagement Disable
UnicastResponseToMulticast Enable
Logging:
LogAllowedConnections Disable
LogDroppedConnections Disable
FileName %systemroot%\system32\LogFiles\Firewall\pfirewall.log
MaxFileSize 4096
Ok.
C:\>
You can check on whether the firewall is permitting connectivity on a
particular network port, e.g., TCP port 3389 for the
Remote Desktop
Protocol (RDP), from a PowerShell prompt, which you can obtain by
typing powershell in the Windows "Search" field at the bottom
of the screen and then clicking on Windows PowerShell when you see
it returned by the search function. At the PowerShell prompt, you can issue
the command Get-NetFirewallPortFilter | Where-Object { $_.LocalPort -eq
3389 } | Get-NetFirewallRule. If you wished to check on whether
firewall connectivity is permitted for some other protocol, substitute
the port used by that protocol, e.g., port 22 for
Secure Shell (SSH)
connections.
[ More
Info ]
[/os/windows/software/security/firewall]
permanent link
Modifying an existing Windows Firewall rule
You can determine if the Microsoft
Windows Firewall is enabled from a command line interface (CLI) by
opening a command prompt window
and using the
netsh command
netsh advfirewall show currentprofile. If it is
enabled, you will see the "state" value is set to "ON".
C:\Users\nell>netsh advfirewall show currentprofile
Public Profile Settings:
----------------------------------------------------------------------
State ON
Firewall Policy BlockInbound,AllowOutbound
LocalFirewallRules N/A (GPO-store only)
LocalConSecRules N/A (GPO-store only)
InboundUserNotification Enable
RemoteManagement Disable
UnicastResponseToMulticast Enable
Logging:
LogAllowedConnections Disable
LogDroppedConnections Disable
FileName %systemroot%\system32\LogFiles\Firewall\pfirewall.log
MaxFileSize 4096
Ok.
C:\Users\nell>
If you want to check on whether inbound access is permitted through the
firewall for a particular port or application, you can search for it with a
netsh advfirewall firewall show rule name=all dir=in command.
Since there will likely be many lines of output, you can filter the output for
a particular port or application name by
piping it to the find command. E.g., if I want to check on whether a rule is
in place for an SSH server application, I can have find look for
"SSH".
C:\Users\nell>netsh advfirewall firewall show rule name=all dir=in | find "SSH"
Rule Name: Bitvise SSH Server (TCP/IPv6 22)
Grouping: Bitvise SSH Server
Rule Name: Bitvise SSH Server (TCP/IPv4 22)
Grouping: Bitvise SSH Server
C:\Users\nell>
[ More Info ]
[/os/windows/software/security/firewall]
permanent link
Checking and changing the Windows Firewall settings on a Windows system
The
advfirewall command can be used from a command prompt
to check and modify the settings for the Microsoft Windows Firewall
software on a Windows Vista, 7, 8, or Server 2008 system.
[ More Info
]
[/os/windows/software/security/firewall]
permanent link
Kerio Personal Firewall 2.1.5
I've been using Kerio Personal Firewall 2.1.5 from
Kerio Technologies on a Windows 98 Second
Edition (SE) system. I hadn't use the system for quite awhile. When
I did so today, I checked on whether an update was available for the firewall
software. I learned that the Kerio Personal Firewall software was acquired
by
Sunbelt Software.
Sunbelt's rebranded version of the firewall doesn't run on Windows 98
according to Sunbelt's FAQ.
The Sunbelt Kerio Personal Firewall 4 requires 10 MB of disk space for
installation and runs ONLY on desktop editions of Windows 2000 and XP. Kerio
Personal Firewall 4 DOES NOT run on Windows 9x, Me, NT, 2000 Server and 2003
Server.
Sunbelt doesn't support nor offer for download the old 2.1.5 version, which
was available for free from Kerio Technologies, but states in the FAQ that
it can still be found at various sites on the Net for download by doing
a
Google search for "Kerio 2.1.5" and
that technical support for the older version can still be obtained from
the
Kerio Forum at
CastleCops.
[/os/windows/software/security/firewall]
permanent link
Norton Internet Security Network Access Problem
I've spent a few days trying to resolve a problem on a system where there
was no web access, but I could ping IP addresses, except for the IP address
of the system itself. I finally traced the problem to the Norton Internet
Security 2002 firewall software running on the system.
[
More Info ]
[/os/windows/software/security/firewall]
permanent link
