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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 .

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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.

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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

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