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I'm not a SharePoint admin so I'm very new to this. My SharePoint site keeps asking for username/password. The site is obviously listed as local intranet. I am also not able to open the site in SharePoint designer. It asks for my credentials 3x then displays an error that says:
The folder isn't accessible. The folder may be located in an unavailable location, protected password, or the filename contains / or .
I had the same issue. Turned out I had Kerberos set up on the site. You can change this in central admin. The answer on this post steps you through the process.
Look for authentication providers in IIS management console for your SharePoint site (IIS MMC/your site/authentication/windows authentication/providers)
NTLM should be first or only option
