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I enter to a Sharepoint site on-premise correctly from Safari browser on an IOS device, but when I close and re-open the browser ask me again credentials without remember them and does not give me the option to save. I tried accessing a Sharepoint Online and ask me. The problem is with on-premise site and probably it is the authentication mode used, NTLM.

Does anyone know any workaround to avoid having to enter credentials every time?

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You should setup Web Application Proxy (WA-P) to handle the authentication mechanism as the iOS devices don't have cached credentials capability since they are not domain devices. So when a user hits the SharePoint On-Prem site, they are prompted by WA-P for credentials and then WA-P would securely handle the authentication and then handoff the content rendering to SharePoint server.

It would require some SharePoint admin efforts, but overall it's a very rugged , secure, tried and tested solution to handle BYOD issues.

Web Application Proxy is basically a simplified TMG Server; it’s without a lot of the functionality TMG Server has but on the plus side it gives a real quick way of setting up a reverse-proxy for a web application like SharePoint. There’s no firewall functionality as before outside of what comes with Windows Server by default; the beauty of this role is its simplicity.

Web Application Proxy has two modes of authentication for authenticating against whatever web-app you’re publishing; pass-through and ADFS. The principal is the same though; it’ll act as a safety buffer between your internal SharePoint systems and the outside world as no traffic will reach SharePoint unless it’s been authenticated 1st.

Overall, the flow would be something like below:

enter image description here

References -

Publishing SharePoint with Windows Server 2012 R2 Web Application Proxy

SharePoint Server and Web Application Proxy – continued

SharePoint repeatedly prompting iPad users for credentials

Authenticating to SharePoint from iOS devices

  • I agree to your idea in implementing an authentication-proxy in front of SharePoint. But you should not recommend TMG. This product is discontinued. Even the TMG-successor UAG is already discontinued. So we should recommend him to implement a WebApplicationProxy. – MHeld Oct 31 '16 at 8:43
  • My bad, you are correct. I had answered based on one of my old client's use cases. Didn't know it was discontinued. Thanks a lot. Based on your comments, I have updated the answer. – Gautam Sheth Oct 31 '16 at 18:41

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