Sharepoint Site Requires Network Authentication

i have added sharepoint site trusted sites in ie, , changed custom level trusted sites use current user name , password.  seemed work - able open sharepoint site without entering user name , password, reason, these same settings has begun asking user name , password enter sharepoint site.  have ideas on might causing this?

hi cindykf,

thank post.

i give these suggestions:
1. check ie connection proxy setting, select automatically detect settings and bypass proxy server local addresses
2. check ie trust sites custom level, user authentication select automatic logon current user , password
3. open control panel-- user accounts--manage credentials, check if store credentials sharepoint site

if there more inquiries on issue, please feel free let know.

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regards,
rick tan

Windows Server  >  Server Manager