1 files changed, 5 insertions, 1 deletions

diff --git a/plugins/check_tcp.c b/plugins/check_tcp.c
index 5c287b7a..d8fc26e7 100644
--- a/plugins/check_tcp.c
+++ b/plugins/check_tcp.c
@@ -198,13 +198,17 @@ main (int argc, char **argv)
 
         if(flags & FLAG_VERBOSE) {
                 printf("Using service %s\n", SERVICE);
-                printf("Port: %d\n", PORT);
+                printf("Port: %d\n", server_port);
                 printf("flags: 0x%x\n", (int)flags);
         }
 
         if(EXPECT && !server_expect_count)
                 server_expect_count++;
 
+        if(PROTOCOL==IPPROTO_UDP && !(server_expect_count && server_send)){
+                usage(_("With UDP checks, a send/expect string must be specified."));
+        }
+
         /* set up the timer */
         signal (SIGALRM, socket_timeout_alarm_handler);
         alarm (socket_timeout);