@Sam Wu-MSFT Sorry for being so late.... Only Windows Authentication is on with providers as Negotiate and NTLM..
Authentication works on localhost:90 (randomly used port 90 as default website takes port 80)
but when I add URL binding to website it keeps asking me for Credentials and fails after 3 attempts.
seems like some issue with cross domain authentication. I am not an expert in AD I have a little knowledge... but that dosent seems to be enough for solving this.
I have been stuck on this issue for a long time now, Any and all help will be highly appreciated.