diff -rup original/plugins/sudoers/sssd.c new/plugins/sudoers/sssd.c
--- original/plugins/sudoers/sssd.c	2012-07-18 13:17:53.026208728 +0200
+++ new/plugins/sudoers/sssd.c	2012-07-18 13:35:59.780623153 +0200
@@ -239,6 +239,14 @@ static int sudo_sss_setdefs(struct sudo_
 	  debug_return_int(-1);
      }
 
+     if (sss_error == ENOENT) {
+         sudo_debug_printf(2, "The user was not found in SSSD.");
+         debug_return_int(-1);
+     } else if(sss_error != 0) {
+         sudo_debug_printf(2, "sss_error=%u\n", sss_error);
+         debug_return_int(-1);
+     }
+
      for (i = 0; i < sss_result->num_rules; ++i) {
 	  sudo_debug_printf(1, "Parsing cn=defaults, %d/%d", i, sss_result->num_rules);
 	  sss_rule = sss_result->rules + i;
@@ -515,7 +523,7 @@ static struct sss_sudo_result *sudo_sss_
 	       }
 	       break;
 	  case ENOENT:
-	       sudo_debug_printf(2, "No result.");
+	       sudo_debug_printf(2, "The user was not found in SSSD.");
 	  default:
 	       sudo_debug_printf(2, "sss_error=%u\n", sss_error);
 	       debug_return_ptr(NULL);
@@ -901,6 +909,14 @@ static int sudo_sss_display_defaults(str
 	  goto done;
      }
 
+     if (sss_error == ENOENT) {
+         sudo_debug_printf(2, "The user was not found in SSSD.");
+         goto done;
+     } else if(sss_error != 0) {
+         sudo_debug_printf(2, "sss_error=%u\n", sss_error);
+         goto done;
+     }
+
      handle->pw = pw;
 
      for (i = 0; i < sss_result->num_rules; ++i) {