Problems with only one Sharepoint 2010 site

Hi, this day for administrative questions i change the alternate acces mapping for one of my web application that work in the 80 port.

I change the URL in the default zone for other URL with another name in the same domain.

Everything work well... i have 24 sites in production everthing ok, but only one site of this collection does not work before i make this change... the site ask for credentials, if the credentials dont have permissions the site repond with the normal page whit the normal acced denied information, but if i enter with credetials with full permissions the site start to charge but nothing happens, that could be stay in that way for hours...

I hope somebody can hep me...

Thanks