1 files changed, 6 insertions, 1 deletions

diff --git a/plugins/check_ntp.c b/plugins/check_ntp.c
index 9cda277..f9dc49a 100644
--- a/plugins/check_ntp.c
+++ b/plugins/check_ntp.c
@@ -335,7 +335,7 @@ int best_offset_server(const ntp_server_results *slist, int nservers){
  *   we have to do it in a way that our lazy macros don't handle currently :( */
 double offset_request(const char *host, int *status){
         int i=0, j=0, ga_result=0, num_hosts=0, *socklist=NULL, respnum=0;
-        int servers_completed=0, one_written=0, servers_readable=0, best_index=-1;
+        int servers_completed=0, one_written=0, one_read=0, servers_readable=0, best_index=-1;
         time_t now_time=0, start_ts=0;
         ntp_message *req=NULL;
         double avg_offset=0.;
@@ -437,12 +437,17 @@ double offset_request(const char *host, int *status){
                                 servers[i].rtdelay=NTP32asDOUBLE(req[i].rtdelay);
                                 servers[i].waiting=0;
                                 servers_readable--;
+                                one_read = 1;
                                 if(servers[i].num_responses==AVG_NUM) servers_completed++;
                         }
                 }
                 /* lather, rinse, repeat. */
         }
 
+        if (one_read == 0) {
+                die(STATE_CRITICAL, "NTP CRITICAL: No response from NTP server\n");
+        }
+
         /* now, pick the best server from the list */
         best_index=best_offset_server(servers, num_hosts);
         if(best_index < 0){