diff --git a/src/Main/fg_init.cxx b/src/Main/fg_init.cxx
index 8efcb805d..2143f67f5 100644
--- a/src/Main/fg_init.cxx
+++ b/src/Main/fg_init.cxx
@@ -882,29 +882,6 @@ void fgPostInitSubsystems()
     nasal->init();
     SG_LOG(SG_GENERAL, SG_INFO, "Nasal init took:" << st.elapsedMSec());
 
-    // Ensure IOrules and path validation are working properly by trying to
-    // access a folder/file which should never be accessible.
-    const char* no_access_path =
-#ifdef _WIN32
-      "Z:"
-#endif
-      "/do-not-access";
-
-    if( fgValidatePath(no_access_path, true) )
-      SG_LOG
-      (
-        SG_GENERAL,
-        SG_ALERT,
-        "Check your IOrules! (write to '" << no_access_path << "' is allowed)"
-      );
-    if( fgValidatePath(no_access_path, false) )
-      SG_LOG
-      (
-        SG_GENERAL,
-        SG_ALERT,
-        "Check your IOrules! (read from '" << no_access_path << "' is allowed)"
-      );
-  
     // initialize methods that depend on other subsystems.
     st.stamp();
     globals->get_subsystem_mgr()->postinit();
diff --git a/src/Scripting/NasalSys.cxx b/src/Scripting/NasalSys.cxx
index 75c49fbcf..a991ece66 100644
--- a/src/Scripting/NasalSys.cxx
+++ b/src/Scripting/NasalSys.cxx
@@ -855,6 +855,12 @@ void FGNasalSys::init()
     signal->setBoolValue(s, true);
     signal->removeChildren(s);
 
+    if( !checkIOrules() )
+    {
+      SG_LOG(SG_NASAL, SG_ALERT, "Required IOrules check failed.");
+      exit(-1);
+    }
+
     // Pull scripts out of the property tree, too
     loadPropertyScripts();
   
@@ -1284,6 +1290,47 @@ void FGNasalSys::gcRelease(int key)
     naGCRelease(key);
 }
 
+//------------------------------------------------------------------------------
+bool FGNasalSys::checkIOrules()
+{
+  // Ensure IOrules and path validation are working properly by trying to
+  // access a folder/file which should never be accessible.
+  const char* no_access_path =
+#ifdef _WIN32
+    "Z:"
+#endif
+    "/do-not-access";
+
+  bool success = true;
+
+  // write access
+  if( fgValidatePath(no_access_path, true) )
+  {
+    success = false;
+    SG_LOG
+    (
+      SG_GENERAL,
+      SG_ALERT,
+      "Check your IOrules! (write to '" << no_access_path << "' is allowed)"
+    );
+  }
+
+  // read access
+  if( fgValidatePath(no_access_path, false) )
+  {
+    success = false;
+    SG_LOG
+    (
+      SG_GENERAL,
+      SG_ALERT,
+      "Check your IOrules! (read from '" << no_access_path << "' is allowed)"
+    );
+  }
+
+  return success;
+}
+
+//------------------------------------------------------------------------------
 void FGNasalSys::NasalTimer::timerExpired()
 {
     nasal->handleTimer(this);
diff --git a/src/Scripting/NasalSys.hxx b/src/Scripting/NasalSys.hxx
index e487a48eb..096a591be 100644
--- a/src/Scripting/NasalSys.hxx
+++ b/src/Scripting/NasalSys.hxx
@@ -128,7 +128,21 @@ public:
     // when done.
     int gcSave(naRef r);
     void gcRelease(int key);
-    
+
+    /**
+     * Check if IOrules correctly work to limit access from Nasal scripts to the
+     * file system.
+     *
+     * @note Just a simple test is performed to check if access to a path is
+     *       possible which should never be possible (The actual path refers to
+     *       a file/folder named 'do-not-access' in the file system root).
+     *
+     * @see http://wiki.flightgear.org/IOrules
+     *
+     * @return Whether the check was successful.
+     */
+    bool checkIOrules();
+
     /// retrive the associated log object, for displaying log
     /// output somewhere (a UI, presumably)
     simgear::BufferedLogCallback* log() const