That error message comes from the web server and not from joomla.
On 10 Apr 2016 6:00 am, "andirons" notifications@github.com wrote:

While working on my site running Joomla 3.5.1, all of a sudden when I go
to save or change something I get an error msg "Unauthorized - This server
could not verify that you are authorized to access the document requested.
Either you supplied the wrong credentials (e.g., bad password), or your
browser doesn't understand how to supply the credentials required.
Additionally, a 401 Unauthorized error was encountered while trying to use
an Error Document to handle the request." I have the right credentials
because I have logged into my Joomla admin acct, but cannot access the
admin site. I've tried logging in on Firefox, Explorer and Chrome and get
the same error msg on each browser. I've tried emptying my cache, rebooted
my computer, rebooted my modem and nothing seems to get rid of the error
msg except to let some time pass (30+ minutes). Then it seems to reset
itself.

I run Joomla 3.3 on another site using the same server and I have no
problems.
System information (as much as possible)

Joomla 3.5.1, Prostar template

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