Index: /trunk/src/VBox/Main/src-client/ConsoleImpl.cpp
===================================================================
--- /trunk/src/VBox/Main/src-client/ConsoleImpl.cpp	(revision 57598)
+++ /trunk/src/VBox/Main/src-client/ConsoleImpl.cpp	(revision 57599)
@@ -4086,4 +4086,8 @@
             if (RT_FAILURE(vrc))
             {
+                /* This may happen if the NAT network adapter is currently not attached.
+                 * This is a valid condition. */
+                if (vrc == VERR_PDM_NO_DRIVER_ATTACHED_TO_LUN)
+                    break;
                 ComAssertRC(vrc);
                 rc = E_FAIL;