I have authentication problem when used IE to access my SharePoint site. When I enter the address of the site, I don't receive any prompt to enter username and password and I get the error message "401 UNAUTHORIZED". I have no such problem when using Firefox or Chrome. I searched about this problem and a solution was changing authentication type in IIS from "Windows Authentication" to "Basic Authentication". This solution worked for me, but Basic Authentication is not secure and I don't want to use it. Is there any solution else to solve this problem?