Index: /trunk/src/VBox/ValidationKit/testdriver/vboxwrappers.py
===================================================================
--- /trunk/src/VBox/ValidationKit/testdriver/vboxwrappers.py	(revision 71083)
+++ /trunk/src/VBox/ValidationKit/testdriver/vboxwrappers.py	(revision 71084)
@@ -1548,11 +1548,11 @@
                 if sys.version_info[0] < 3:
                     abHostIP = (ord(abHostIP[0]), ord(abHostIP[1]), ord(abHostIP[2]), ord(abHostIP[3]));
-                if   abHostIP[0] == 127 \
-                  or (abHostIP[0] == 169 and abHostIP[1] == 254) \
-                  or (abHostIP[0] == 192 and abHostIP[1] == 168 and abHostIP[2] == 56):
-                    reporter.log('warning: host IP for "%s" is %s, most likely not unique.' % (sHostName, sHostIP))
-            except:
-                reporter.errorXcpt('failed to determine the host IP for "%s".' % (sHostName,))
-                return False
+            except:
+                return reporter.errorXcpt('failed to determine the host IP for "%s".' % (sHostName,))
+            if   abHostIP[0] == 127 \
+              or (abHostIP[0] == 169 and abHostIP[1] == 254) \
+              or (abHostIP[0] == 192 and abHostIP[1] == 168 and abHostIP[2] == 56):
+                return reporter.error('host IP for "%s" is %s, most likely not unique.' % (sHostName, sHostIP))
+
             sDefaultMac = '%02X%02X%02X%02X%02X%02X' \
                 % (0x02, abHostIP[0], abHostIP[1], abHostIP[2], abHostIP[3], iNic)
@@ -1563,13 +1563,11 @@
             oNic = self.o.machine.getNetworkAdapter(iNic)
         except:
-            reporter.errorXcpt('getNetworkAdapter(%s) failed for "%s"' % (iNic, self.sName))
-            return False
+            return reporter.errorXcpt('getNetworkAdapter(%s) failed for "%s"' % (iNic, self.sName))
 
         try:
             oNic.MACAddress = sMacAddr
         except:
-            reporter.errorXcpt('failed to set the MAC address on slot %s to "%s" for VM "%s"' \
+            return reporter.errorXcpt('failed to set the MAC address on slot %s to "%s" for VM "%s"' \
                 % (iNic, sMacAddr, self.sName))
-            return False
 
         reporter.log('set MAC address on slot %s to %s for VM "%s"' % (iNic, sMacAddr, self.sName))
Index: /trunk/src/VBox/ValidationKit/testmanager/batch/virtual_test_sheriff.py
===================================================================
--- /trunk/src/VBox/ValidationKit/testmanager/batch/virtual_test_sheriff.py	(revision 71083)
+++ /trunk/src/VBox/ValidationKit/testmanager/batch/virtual_test_sheriff.py	(revision 71084)
@@ -188,5 +188,5 @@
     def getMainLog(self):
         """
-        Tries to reads the main log file since this will be the first source of information.
+        Tries to read the main log file since this will be the first source of information.
         """
         if self.sMainLog:
@@ -205,5 +205,5 @@
     def getLogFile(self, oFile):
         """
-        Tries to reads the given file as a utf-8 log file.
+        Tries to read the given file as a utf-8 log file.
         oFile is a TestFileDataEx instance.
         Returns empty string if problems opening or reading the file.
@@ -486,4 +486,5 @@
     ktReason_Host_Modprobe_Failed                      = ( 'Host',              'Modprobe failed' );
     ktReason_Host_Install_Hang                         = ( 'Host',              'Install hang' );
+    ktReason_Host_NetworkMisconfiguration              = ( 'Host',              'Network misconfiguration' );
     ktReason_Networking_Nonexistent_host_nic           = ( 'Networking',        'Nonexistent host networking interface' );
     ktReason_OSInstall_GRUB_hang                       = ( 'O/S Install',       'GRUB hang' );
@@ -883,4 +884,5 @@
         ( True,  ktReason_OSInstall_Sata_no_BM,                     'PCHS=14128/14134/8224' ),
         ( True,  ktReason_Host_DoubleFreeHeap,                      'double free or corruption' ),
+        ( True,  ktReason_Host_NetworkMisconfiguration,             'most likely not unique' ),
     ];