How to handle "Authentication required" window in Selenium?

I need to enter Username and Password in Authentication required window in Chrome, but it's not working due to

NoAlertPresentException

So my software just waiting for alert to pop-up, then getting this exception and trying again in 3 seconds and it's just looping like there is no any alert at all.

driver.SwitchTo().Alert().SetAuthenticationCredentials(User,Pass);
driver.SwitchTo().Alert().Accept();

I found similar question and the only answer was to use this method, but it's not working for me too because of DNS error, seems like I can't authenticate using this.

 driver.get(http://Username:Password@SiteURL)