Hi edadare,
Based on your error message, this issue was caused occurs when the following conditions are true:
- The server is configured for Basic authentication.
- The connection between your computer and the web server does not use Secure Sockets Layer (SSL).
By default, file operations that use Basic authentication over a non-SSL HTTP connection are disabled in Office 2010 and Office 2013 applications.
When Basic authentication is disabled, one of the following events occurs:
- The client application uses a different authentication method. This occurs if the server supports a different authentication method.
- The request fails (for details about what happens when a request fails, see the list in the "Additional symptom details" section).
Please try these workarounds to help you.
Workaround 1:
Try to use HTTPS to instead of HTTP.
Workaround 2:
Connecting a web server by using Basic authentication over a non-SSL connection.
To enable Basic authentication on the client computer, follow these steps:
- In Windows Vista or Windows 7: click Start, type regedit in the Start Search box, and then press Enter.
In Windows 8: hold the Windows key (WINKEY) + F, highlight Apps in the Menu bar, type regedit in the Search box, and then press Enter.
- Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WebClient\Parameters
- On the Edit menu, point to New, and then click DWORD Value.
- Type BasicAuthLevel, and then press Enter.
- Right-click BasicAuthLevel, and then click Modify.
- In the Value data box, type 2, and then click OK.
Note The mapping is as follows:
0 - Basic authentication disabled
1 - Basic authentication enabled for SSL connections only
2 - Basic authentication enabled for SSL and non-SSL connections
- Exit Registry Editor, and then restart the computer.
Workaround 3
Update the Registry on the client
- Start Registry Editor.
- Locate and then click one of the following registry subkeys:
For Office 2010
HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Common\Internet
- On the Edit menu, point to New, and then click DWORD Value.
- Type BasicAuthLevel, and then press Enter.
- Right-click BasicAuthLevel, and then click Modify.
- In the Value data box, type 2, and then click OK.
Note The mapping is as follows:
0 - Basic authentication disabled
1 - Basic authentication enabled for SSL connections only
2 - Basic authentication enabled for SSL and for non-SSL connections
- Exit Registry Editor, and then restart the computer.
More information please read this article:
https://support.microsoft.com/en-us/kb/2123563
Please try these methods and check if the work for you.
Regards,
George ZhaoTechNet Community Support