SYMPTOM:
Windows authentication does not work in Strategy Web using IE browser on IIS web server. The login credential is prompted constantly when correct user name and password is input.
NOTE: The issue does not happen using other browsers than IE, like Firefox or Google Chrome.
CAUSE:
One possible cause is that in IIS manager, "Negotiate" is on the top of list in Authentication->Windows Authentication->Providers, as shown below:

NOTE: IE browser uses Kerberos logon. Other browsers use NTLM directly.
ACTION:
In IIS Authentication Provider dialog, make sure NTLM is on the top of enabled provider list.
KB41138