--- asterisk-1.4.0-beta4/main/manager.c	2006-12-07 09:33:32.000000000 -0600
+++ /usr/src/asterisk-1.4.0-beta4/main/manager.c	2006-12-24 12:55:26.000000000 -0600
@@ -390,6 +390,21 @@
 	return out;
 }
 
+static int ast_get_manager_session_count_by_name(const char *name)
+{
+	struct mansession *session = NULL;
+	int count = 0;
+	
+	AST_LIST_TRAVERSE(&sessions, session, list)
+		if (!strcasecmp(session->username, name)) {
+			count++;
+			ast_verbose(VERBOSE_PREFIX_2 "Manager '%s' session count %d\n", name, count);
+		}
+			
+			
+	
+	return count;
+}
 
 
 static struct ast_manager_user *ast_get_manager_by_name_locked(const char *name)
@@ -1924,6 +1939,7 @@
 	char action[80] = "";
 	struct manager_action *tmp = first_action;
 	char *id = astman_get_header(m,"ActionID");
+	char *user = astman_get_header(m, "Username");
 	char idText[256] = "";
 	int ret = 0;
 
@@ -1956,6 +1972,12 @@
 				return 0;
 			}
 		} else if (!strcasecmp(action, "Login")) {
+			/* Check for duplicate logins */
+			if (ast_get_manager_session_count_by_name(user) > 0) {
+				sleep(1);
+				astman_send_error(s, m, "Duplicate login deined.");
+				return -1;
+			}
 			if (authenticate(s, m)) {
 				sleep(1);
 				astman_send_error(s, m, "Authentication failed");