diff --git a/lib/plugins/Invoke-IcingaCheckCheckSum.psm1 b/lib/plugins/Invoke-IcingaCheckCheckSum.psm1
index 1d2cc02..a11d50a 100644
--- a/lib/plugins/Invoke-IcingaCheckCheckSum.psm1
+++ b/lib/plugins/Invoke-IcingaCheckCheckSum.psm1
@@ -46,7 +46,7 @@ function Invoke-IcingaCheckCheckSum()
 {
     param(
         [string]$Path       = $null,
-        [ValidateSet]('SHA1', 'SHA256', 'SHA384', 'SHA512', 'MD5')
+        [ValidateSet('SHA1', 'SHA256', 'SHA384', 'SHA512', 'MD5')]
         [string]$Algorithm  = 'SHA256',
         [string]$Hash       = $null,
         [switch]$NoPerfData,
diff --git a/lib/plugins/Invoke-IcingaCheckFirewall.psm1 b/lib/plugins/Invoke-IcingaCheckFirewall.psm1
new file mode 100644
index 0000000..8857e4e
--- /dev/null
+++ b/lib/plugins/Invoke-IcingaCheckFirewall.psm1
@@ -0,0 +1,73 @@
+<#
+.SYNOPSIS
+   Checks whether a firewall module is enabled or not
+.DESCRIPTION
+   Invoke-IcingaCheckFirewall returns either 'OK' or 'CRITICAL', whether the check matches or not.
+
+   More Information on https://github.com/LordHepipud/icinga-module-windows
+.FUNCTIONALITY
+   This module is intended to be used to check the status of a firewall profile.
+   Based on the match result the status will change between 'OK' or 'CRITICAL'. The function will return one of these given codes.
+.EXAMPLE
+   PS> Invoke-IcingaCheckFirewall -Profile "Domain" -Verbosity 3
+   [OK] Check package "Firewall profiles" (Match All)
+   \_ [OK] Firewall Profile Domain is True
+   | 'firewall_profile_domain'=True;; 
+   0
+.EXAMPLE
+   PS> Invoke-IcingaCheckFirewall -Profile "Domain", "Private" -Verbosity 1}
+   [OK] Check package "Firewall profiles" (Match All)
+   | 'firewall_profile_domain'=True;; 'firewall_profile_private'=True;; 
+   0
+        [array]$Profile,
+        [bool]$Status     = $TRUE,
+.PARAMETER Profile
+   Used to specify an array of profiles to check.
+
+.PARAMETER Status
+   Used to specify a bool value, which determines, whether the firewall profiles should be enabled or disabled.
+
+   -Status $TRUE
+   translates to enabled, while
+   -Status $FALSE
+   translates to disabled.
+.INPUTS
+   System.String
+
+.OUTPUTS
+   System.String
+
+.LINK
+   https://github.com/LordHepipud/icinga-module-windows
+.NOTES
+#>
+
+function Invoke-IcingaCheckFirewall()
+{
+    param(
+        [array]$Profile,
+        [bool]$Status     = $TRUE,
+        [switch]$NoPerfData,
+        [int]$Verbosity     = 0
+    );
+
+    if ($Status -eq $TRUE) {
+        $StatusString = "true"
+    } else {
+        $StatusString = "false"
+    }
+
+    $FirewallPackage = New-IcingaCheckPackage -Name 'Firewall profiles' -OperatorAnd -Verbos $Verbosity;
+
+    foreach ($singleprofile in $Profile) {
+        $FirewallData = (Get-NetFirewallProfile -Name $singleprofile)
+
+        $FirewallCheck = New-IcingaCheck -Name "Firewall Profile $singleprofile" -Value $FirewallData.Enabled;
+        $FirewallCheck.CritIfNotMatch($StatusString) | Out-Null;
+    
+    $FirewallPackage.AddCheck($FirewallCheck)
+    }
+
+
+    return (New-IcingaCheckResult -Check $FirewallPackage -NoPerfData $NoPerfData -Compile);
+}
\ No newline at end of file