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I am facing this problem inside our customer's on-premises sharepoint server 2013:-

  1. when i try to access the main site collection using the servername http://serverABC/, from the sharepoint server itself i was prompted to enter username/password, and i access the site correctly.

  2. when i try to access the main site collection using the servername http://serverABC/, from a server within the customer's network, I was prompted to enter username/password, and i access the site correctly.

  3. But the problem when i try to access the main site collection using the servername http://serverABC/, from a server outside the customer network (from my PC), i was prompted to enter username/password as follow:-

enter image description here

  1. but when i enter the username/password, i will be prompted to enter the username/password again for 3 times, then i got this page:- enter image description here

Now inside my PC i try to ping the sharepoint server ip and i got correct reply. so the server ip is accessible from my PC, and i have changed my hosts file inside my PC as follow:-

192..*.2** servernameABC

So seems the server is accessible from my PC (since i can ping the IP + when i try accessing the main site collection i was prompted to enter username/password and i did not get http not found error). but not sure why i can not login to the sites? and i keep getting username/password popup for 3 times then i got http 401 error??

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You might have a proxy configured in your Internet Options of Internet Explorer. This will bypass any HOSTS-Entries and ping-checks.

  • but if there is a proxy settings preventing me from accessing the server, will this show a popup to enter user name and password? and seems this popup is from sharepoint site, which means i can reach the sharepoint site? or this is not necessary ? – john Gu May 11 '18 at 14:10
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    The Password-Window says something about "level_15_access". I've never seen this associated with SharePoint. Googling for that gives tons of Cisco-related results. – MHeld May 12 '18 at 7:14
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    It should be enough to remove the proxy from your IE-Settings to reach SharePoint. But this will likely break InternetConnection on that client. If this doesn't work, you must talk to the proxy-admins. – MHeld May 14 '18 at 6:06
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    Are you accessing Customers Server via Internet or is your PC Placed inside customers LAN? – MHeld May 15 '18 at 20:27
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    You should talk to your and your customers network guys. I'm sure the solution can be found there. If you still want to dig deeper by yourself, you could take a Fiddler-Trace. Maybe it tells you more about which active network-devices (Proxys, Reverse-Proxies, Firewalls, NAT-Devices, etc.) you are talking to between your PC and customers SharePoint-Server. As already mentioned, i'd bet you talk to a Cisco-Device. But as those boxes are highly featured, they could be configured to any mode mentioned above. – MHeld May 16 '18 at 5:11

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