SharePoint Prompting for Username/Password for Images/thumbnail

Hello everyone,

I have a site collection with a Newsfeed on the HomePAge. My problem is when I access this website and type my password, it will ask me to type my password more 3-6 times to open the thumbnail of the people that made comments on the Newsfeed. If I ignote to type the password, the website will open without the thumbnail of the people.

Thanks!!!

flavio