Authentication Prompt on Mobile Devices

On my public facing SharePoint 2013 site, I have anonymous authentication enabled, however mobile devices are prompted to authenticate credentials when they visit the site.
All non-mobile devices the site without receiving the authentication prompt, regardless of the browser it uses. Mobile Browser view is deactivated.
I did trace the connection through Fiddler and it looks as though I am getting 3 401 errors when the mobile browser tries to load the page. These errors are triggered when the browser tries to access a css and 2 js files. When I traced the connection
from a pc, I received 404 not found errors when the browser tries to access these files. I'm trying to find where those files are located at, to check to see if they are there or if permissions to that folder/files is the issue, but am still trying to get
an understanding of where the files are stored (I'm still a SharePoint newbie). Based on the info from Fiddler, they are stored at /ui/1.10.4/jquery-ui.js HTTP/1.1, however I don't see that folder in the site contents and structure when I search the site settings
of the SharePoint page.
Lastly, mobile devices had been able to access the page fine for several months, however several server updates and patches were applied to our SharePoint environment recently, which coincided with this issue starting.
Thank you for any insight you might be able to give!

Hi,
According to your description, it continues to prompt for authentication When Windows users tries to connect from mobile devices.
For your issue:
Close all instances of your browser, restart your browser.
If you use apple products with ios8. The problem is Safari. 
It works fine under ios8 when using Chrome.
You can change windows authentication  to basic authentication.
For more information about Troubleshooting HTTP 401 errors in IIS, refer to the article:
http://msdynamicswiki.com/2014/04/24/troubleshooting-http-401-errors-in-iis/
Besides, here is a similar post, you can have a look at:
https://social.technet.microsoft.com/Forums/en-US/34895295-452b-4a89-b59f-6791e485edb2/user-authentication-in-mobile-access?forum=Forefrontedgegeneral
Best Regards,                                                                                                                  
Lisa Chen
Lisa Chen
TechNet Community Support

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