diff -ru cups-orig//backend/ipp.c cups-1.5.0//backend/ipp.c
--- cups-orig//backend/ipp.c	2011-05-26 15:03:28.000000000 +0300
+++ cups-1.5.0//backend/ipp.c	2011-10-18 18:08:36.000000000 +0300
@@ -1598,7 +1598,7 @@
       response   = cupsDoRequest(http, request, resource);
       ipp_status = cupsLastError();
 
-      if (ipp_status == IPP_NOT_FOUND)
+      if (ipp_status == IPP_NOT_FOUND || ipp_status == IPP_NOT_POSSIBLE)
       {
        /*
         * Job has gone away and/or the server has no job history...