<div>
If &nbsp;you have no already done this, you will need to extend the web app and configure the web extension to use Windows Authentication. You will probably have to make some modifications to the web config file and two others. Technet has great information about how to do all of that.<br />
<br />
Good luck...
</div>


<div>
I'm aware of that option but shouldn't it work without extending app ?
</div>


<div>
No, not out of the box anyway. Since you are using a third party application, follow their recommendation. <br />
<br />
What do they recommend?
</div>


<div>
thanks, i have added third party provider but i'm trying to configure that internal users use same URL and authenticate via their windows credentials and not extending app, what can i do so that when Windows authentication is selected on sign in page that the users get their windows credentials prompt ?
</div>


<div>
This should help;<br />
<br />
<a href="https://technet.microsoft.com/en-us/library/cc288475(v=office.14).aspx" rel="ugc">https://technet.microsoft.com/en-us/library/cc288475(v=office.14).aspx</a>
</div>


<div>
ok thanks, as i see it , i should talk to third party STS provider to implement communication with my AD DS
</div>


<div>
Solution offered was accurate and valid.
</div>


<div>
<div class="content wysiwyg-content">
I have successfully configured Sharepoint authentication to use third party STS and when on sign in page i choose xxxxxSTS (see picture) i get the login screen for that provider and can login to site successfully. The problem is that i would also like to use existing domain accounts to login into same site but when i choose &quot;Windows authentication&quot; on Sharepoint sign in page i'm redirected to same login page of custom STS and can't use my domain credentials.<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/08_w34/1112375/sp2013sign-in.jpg" target="_blank" class="file-inline" title="Sharepoint sign in page (12 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>sp2013sign-in.jpg</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2016/08_w34/1112376/authprovider.jpg" target="_blank" class="file-inline" title="authentication provider settings (102 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>authprovider.jpg</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2016/08_w34/1112377/spauthprovider.jpg" target="_blank" class="file-inline" title="get-spauthenticationprovider (56 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>spauthprovider.jpg</a>
</div>
</div>


spauthprovider.jpg

sp2013sign-in.jpg

authprovider.jpg

I have successfully configured Sharepoint authentication to use third party STS and when on sign in page i choose xxxxxSTS (see picture) i get the login screen for that provider and can login to site successfully. The problem is that i would also like to use existing domain accounts to login into same site but when i choose "Windows authentication" on Sharepoint sign in page i'm redirected to same login page of custom STS and can't use my domain credentials.

Sharepoint 2013 claim based authentication, third party+windows authentication

Microsoft Sharepoint is a software platform and family of software products used for collaboration and web publishing combined. These capabilities include developing web sites, portals, intranets, content management systems, search engines, wikis, blogs, and other tools for business intelligence and collaboration. SharePoint has a Microsoft Office-like interface, and it is closely integrated with the Office suite.

Microsoft SharePoint

IIS is Internet Information Services, the web server included with Windows Server operating systems. All current versions are built on a modular architecture; modules can be added or removed individually so that those required for specific functionality are installed. The full installation of IIS includes HTTP, security, content, compression, caching, logging and diagnostics.