January/February 2019 issue of acmqueue The January/February 2019 issue of acmqueue is out now

Subscribers and ACM Professional members login here


  Download PDF version of this article PDF

Error 526 Ray ID: 4bbc892dba13cd00 • 2019-03-23 01:12:13 UTC

Invalid SSL certificate








What happened?

The origin web server does not have a valid SSL certificate.

What can I do?

If you're a visitor of this website:

Please try again in a few minutes.

If you're the owner of this website:

The SSL certificate presented by the server did not pass validation. This could indicate an expired SSL certificate or a certificate that does not include the requested domain name. Please contact your hosting provider to ensure that an up-to-date and valid SSL certificate issued by a Certificate Authority is configured for this domain name on the origin server. Additional troubleshooting information here.


Originally published in Queue vol. 9, no. 3
see this item in the ACM Digital Library



Aleksander Kuzmanovic - Net Neutrality: Unexpected Solution to Blockchain Scaling
Cloud-delivery networks could dramatically improve blockchains' scalability, but clouds must be provably neutral first.

Jim Waldo - A Hitchhiker's Guide to the Blockchain Universe
Blockchain remains a mystery, despite its growing acceptance.

Yonatan Sompolinsky, Aviv Zohar - Bitcoin's Underlying Incentives
The unseen economic forces that govern the Bitcoin protocol

Antony Alappatt - Network Applications Are Interactive
The network era requires new models, with interactions instead of algorithms.


(newest first)

Fernando Blanco | Mon, 17 Sep 2012 21:17:08 UTC

Really interesting text and very easy to understand. My opinion is that this will encourage many IT men and women to propose IPv6 projects in the enterprise.

Jose F. Medeiros | Sat, 23 Apr 2011 12:46:10 UTC

Skynet is watching.. searching for John Connor. Judgement Day is approaching...We must stay off the grid!!!

Jose :-)

Jose F. Medeiros | Sat, 23 Apr 2011 12:42:03 UTC

Well written story, but you forgot to mention that it was Senator Al Gore who pushed through the Supercomputing bill, which gave the United States Defense Advanced Research Project Agency (ARPA) and ultimately ICANN, the funding to expand ArpaNet, and it was Gore who coined the term" Information Super Highway " and the "Internet", which was the begining of Skynet.

Jose F. Medeiros :-) I am still just an IT guy. http://www.sjpc.org/presentations/arrays.pdf


David Miller | Sat, 12 Mar 2011 21:56:25 UTC

Strategies 2 and 3 are excellent strategies. They are the same strategies that were used years ago to *infiltrate* Linux into "Vendor X Only" networks. They worked quite well.

Olivier Bonaventure | Fri, 11 Mar 2011 11:40:25 UTC

I hope that ACM's system and network administrators will read this article and that acm.org and the related websites will become IPv6 enabled before the IPv6 world day in June and remain IPv6 enabled after that. As of today, it does acm.org is still not reachable over IPv6...

Leave this field empty

Post a Comment:

© 2018 ACM, Inc. All Rights Reserved.