Index: /trunk/src/VBox/Main/src-server/xpcom/server_module.cpp
===================================================================
--- /trunk/src/VBox/Main/src-server/xpcom/server_module.cpp	(revision 37009)
+++ /trunk/src/VBox/Main/src-server/xpcom/server_module.cpp	(revision 37010)
@@ -5,5 +5,5 @@
 
 /*
- * Copyright (C) 2006-2007 Oracle Corporation
+ * Copyright (C) 2006-2011 Oracle Corporation
  *
  * This file is part of VirtualBox Open Source Edition (OSE), as
@@ -140,5 +140,10 @@
     if (   PR_Read(readable, msg, sizeof(msg)-1) != 5
         || strcmp(msg, "READY"))
-        goto end;
+    {
+        /* If several clients start VBoxSVC simultaneously only one can
+         * succeed. So treat this as success as well. */
+        rv = NS_OK;
+        goto end;
+    }
 
     rv = NS_OK;