[CentOS] Web site not responding with Firefox 52.6.0 (64-bit)

Sun Mar 4 02:04:07 UTC 2018
Richard <lists-centos at listmail.innovate.net>

> Date: Saturday, March 03, 2018 20:54:56 -0500
> From: Fred Smith <fredex at fcshome.stoneham.ma.us>
> On Sat, Mar 03, 2018 at 06:55:04PM -0600, dsavage at peaknet.net wrote:
>> I don't know if this is a CentOS7/Firefox problem or one with the
>> distant web site slashdot.org. I can connect to it just fine with
>> the latest Firefox on my Windows 10 desktop PC, but not with
>> Firefox 52.6.0 on this CentOS 7.4 laptop. This has been an
>> on-going problem for several weeks.
> I get to slashdot.org, but I get a page where the most recent
> posting is from Thursday.

Most pages I try to go to return the following:

  503 - Service Offline
  Slashdot is presently in offline mode. Only the front page
  and story pages linked from the front page are available in
  this mode. Please try again later.

whether using Chrome or FF 52.6.0 or the current beta 59.0b14.