diff --git a/APPL/FAC/fac_verify.inc b/APPL/FAC/fac_verify.inc
index c39ac08b43..1b8aa674c3 100644
--- a/APPL/FAC/fac_verify.inc
+++ b/APPL/FAC/fac_verify.inc
@@ -290,6 +290,37 @@ function zipfile(pathname, filename)
             }
         }
         xhr4.send(null);
+
+        // Check for .NET *not* beaing enabled
+        var xhr5 = new XMLHttpRequest();
+        xhr5.open('GET', 'fac_verify_test.aspx');
+        xhr5.onreadystatechange = function()
+        {
+            var txt;
+            // Ready state 4 means the request is done
+            if (xhr5.readyState === 4)
+            {
+                if (xhr5.status == 404) // It should not be found when .NET not
+                {
+                    txt = "Calling an aspx fails. Good!";
+                    document.getElementById('resultASPX').innerHTML = 'Ok';
+                    document.getElementById('resultASPX').style.color = 'green';
+                }
+                else
+                {
+                    txt = "Calling an aspx succeeds. Not Good!";
+                    txt += "<br>FACILITOR does not need managed code.";
+                    txt += "<br>Best disable it in the IIS application pool.";
+                    document.getElementById('resultASPX').innerHTML = 'Error';
+                    document.getElementById('resultASPX').style.backgroundColor = 'red';
+                    document.getElementById('resultASPX').style.color = 'black';
+                }
+                var span = document.createElement("span");
+                span.innerHTML = txt;
+                document.getElementById('checkASPX').appendChild( span );
+            }
+        }
+        xhr5.send(null);
     }
     function reload()
     {
@@ -699,6 +730,15 @@ checker("VBscript",
             }
         )
 
+checker("Managed code should not be enabled.",
+            function ()
+            {
+                txt = "Checking managed code: <span id='checkASPX'></span>";
+                res = resultcodes.warning;
+                return { result: res, message: txt, id: "resultASPX" };
+            }
+        )
+
 __GROUP = "FACILITOR software";
 //------------------------------------------------------------------------------
 testfolder("../../cust", true); // mustbethere
diff --git a/APPL/FAC/fac_verify_test.aspx b/APPL/FAC/fac_verify_test.aspx
new file mode 100644
index 0000000000..2c1f229798
--- /dev/null
+++ b/APPL/FAC/fac_verify_test.aspx
@@ -0,0 +1,6 @@
+Dummy testfile
+
+Fac_verify probeert deze aspx te laden en als het goed is
+lukt dat *niet*, maar geeft een 404 error.
+Dat gebeurt als Managed Code niet enabled is onze website
+en dat is niet nodig omdat wij geen managed code gebruiken.
\ No newline at end of file