diff -up ypserv-2.19/lib/access.c.nomap ypserv-2.19/lib/access.c
--- ypserv-2.19/lib/access.c.nomap	2005-05-31 15:37:43.000000000 +0200
+++ ypserv-2.19/lib/access.c	2008-09-25 13:09:06.000000000 +0200
@@ -189,6 +189,8 @@ is_valid (struct svc_req *rqstp, const c
 		  status = -1;
 	      ypdb_close (dbp);
 	    }
+          else
+              status = -4;
 	}
     }
 
diff -up ypserv-2.19/ypserv/server.c.nomap ypserv-2.19/ypserv/server.c
--- ypserv-2.19/ypserv/server.c.nomap	2006-01-10 20:22:20.000000000 +0100
+++ ypserv-2.19/ypserv/server.c	2008-09-25 13:09:06.000000000 +0200
@@ -190,6 +190,11 @@ ypproc_match_2_svc (ypreq_key *argp, ypr
 	    log_msg ("\t-> Ignored (forbidden by securenets)");
 	  result->stat = YP_NOMAP;
 	  break;
+	case -4:
+	  if (debug_flag)
+	    log_msg ("\t-> Ignored (map name not found)");
+	  result->stat = YP_NOMAP;
+	  break;
 	}
       return TRUE;
     }