If you are using IE, then enable windows integrated authentication from tools --> internet options -- advanced tab.
Also when you access the site, see which zone it is going to. If it is going to internet, single sign on may not work. So you have to add the site to your intranet zone by going to tools --> internet options --> security tab --> local intranet --> sites --> advanced --> type the URL such as http://yoursitename.test.com and click add
Also make sure tools --> internet options --> security tab --> local intranet --> custom level --> authentication --> automatic logon only in intranet zone option is selected
Also Kerberos will never work on local machine. You have to try from remote machine in the network.
Good luck.