Minor changes to .gitignore and error messages (#1408)

* minor changes

* Changes per reviewer comments

Author: davidBar-On

.gitignore

@@ -30,3 +30,4 @@ examples/.libs
 examples/Makefile
 examples/mic
 examples/mis
+.vscode/

src/iperf_api.c

@@ -2006,7 +2006,7 @@ int test_is_authorized(struct iperf_test *test){
             return 0;
         } else {
             if (test->debug) {
-                iperf_printf(test, report_authentication_failed, username, ts);
+                iperf_printf(test, report_authentication_failed, ret, username, ts);
             }
             free(username);
             free(password);

src/iperf_error.c

@@ -260,11 +260,11 @@ iperf_strerror(int int_errno)
             snprintf(errstr, len, "received an unknown control message");
             break;
         case IESENDMESSAGE:
-            snprintf(errstr, len, "unable to send control message");
+            snprintf(errstr, len, "unable to send control message - port may not be available, the other side may have stopped running, etc.");
             perr = 1;
             break;
         case IERECVMESSAGE:
-            snprintf(errstr, len, "unable to receive control message");
+            snprintf(errstr, len, "unable to receive control message - port may not be available, the other side may have stopped running, etc.");
             perr = 1;
             break;
         case IESENDPARAMS:

src/iperf_locale.c

@@ -307,7 +307,7 @@ const char report_authentication_succeeded[] =
 "Authentication succeeded for user '%s' ts %ld\n";
 
 const char report_authentication_failed[] =
-"Authentication failed for user '%s' ts %ld\n";
+"Authentication failed with return code %d for user '%s' ts %ld\n";
 
 const char report_reverse[] =
 "Reverse mode, remote host %s is sending\n";