Соединение было сброшено, Tomcat8

Я загрузил .war из https://github.com/UniTime/unitime/releases/, а затем просмотрел через Tomcat-менеджер для .war-файла, но кнопка Deploy вернула следующую ошибку: соединение было сброшено [ ! d0] The connection to the server was reset while the page was loading. The site could be temporarily unavailable or too busy. Try again in a few moments. If you are unable to load any pages, check your computer’s network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.