Don't have Telegram yet? Try it now!
https://blog.it-kb.ru/2014/06/24/forward-proxy-squid-3-3-on-ubuntu-server-14-04-lts-part-4-configure-kerberos-and-ntlm-on-samba-and-winbind/
Настройка прокси сервера Squid 3.3 на Ubuntu Server 14.04 LTS. Часть 4. Конфигурация Kerberos и NTLM