Login dialog box is always displayed when you try to access external web services in Skype for Business Server 2015

Applies to: Skype for Business Server 2015

Symptoms


Assume that you enable the passive authentication for the web services of the Front End Server pool in Microsoft Skype for Business Server 2015. When you use the Skype for Business client to access the external web services, a credential prompt (sign-in dialog box) is displayed even if the NTLM authentication protocol is disabled.