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Some History

As DOSarrest expanded its DDoS protection cloud, now located in London, UK, NYC, LA, Vancouver, Hong Kong and Singapore, we needed to know the uptime and performance of all of our customers' sites as viewed from all 6 locations. We set out to find an external 3rd party service that we could subscribe to in order to fulfill this requirement. What we had hoped and thought to be a fairly straightforward exercise and at a reasonable expense was not. After months of searching we soon realized that it was going to cost from $200.00-$400.00/month per URL to accomplish our goal. This added cost was obviously not going to be feasible, given the thousands of domains presently under protection. Plan "B" was put in motion, which was the development and deployment of DOSarrest External Monitoring Service(DEMS). In Q2 2018 we have just released our latest generation of monitoring software. We think it’s as good as any 3rd party monitoring service available on the Internet today.


Who needs this service?

  • Anyone who is geographically load balancing a website
  • Anyone using a CDN to geographically distribute their content
  • Anyone who is hosting or responsible for 1 or more mission critical websites

Who does not need this service?

  • Anyone who is running a non-mission critical, single website in a single location. There are plenty of free website monitors that will meet your requirements.

"DEMS" Value Proposition – Why use "DEMS"?

Scenario 1 – The CDN user

If you're using a CDN to distribute your website on a global basis things may appear fine when viewing your website from your vantage point, but the website could be completely unavailable in another part of the globe. Would you know if it's down? Would you know real-time if it's very slow? Sales dropped off yesterday in Asia, can you go back and see what happened closer to where the sales drop was?

Scenario 2 – The Network operations Center

You are a Managed Hosting provider servicing 50 mission critical websites. A call comes in with a complaint from a customer saying, "I'm in Florida and my site is down!" Could you tell with one glance, that the site is in fact up and it is this particular viewer that has an issue and not the website? Or will you spend a couple of hours trying to figure out what and where the problem is?

DEMS is one of the easiest ways to keep track of tens or hundreds of websites in real-time, a perfect Managed Hosting tool.

Custom Configurations

System Overview

The system is comprised of sensors located in 6 different geographic regions. Each sensor is located externally to any of DOSarrest's networks' and performs the following checks every 60 seconds

  • DNS resolution for the configured URL
  • TCP connection
  • HTTP(S) execution (first byte download)
  • HTTP(S) transfer
  • Set alerts/warnings on SSL, MySQL, PHP, ASP, Java, etc.
  • Set warnings on SSL cert expiration and content changes

All of the above data is collected and archived and available for real-time auto-refreshing views or historical viewing

See how easy and intuitive DEMS can make the real-time monitoring of all of your websites from multiple locations actually be!

Contact for more information, or for a free demo.

  • This is a free service for customers subscribed to DOSarrest's DDoS protection service.
  • This service can be purchased as a standalone service, without DDoS protection.

DOSarrest External Monitoring Service "DEMS" Overview

  • Eight sensors globally distributed
  • Elegant design, keep track of one or hundreds of websites at glance
  • View and compare performance for all sensors real-time and historical
  • All views are 60 second auto-refreshing
  • Set failure alerts on DNS resolution, TCP , SSL, HTTP, HTTP Empty Response, MySQL, PHP, ASP, Java, etc.
  • Set alerts on SSL changes and content changes
  • Calculates uptime by day, week, month and year
  • Send alert emails or SMS messages to anyone
  • 24/7/365 instant support
  • 24/7/365 technical alert/failure investigation, resolution recommendations and customer notification

DEMS Dashboard

Performance Graph

Performance Graph

Status Graph

Status Graph

If you are using a CDN or manage a number of high end mission critical websites, YOU NEED THIS!!!

We own and operate our own servers, network gear and contract directly with numerous tier 1 providers. Our global network capacity is at 3Tbps and ever increasing.

No. of URLs Standard Premium
1 $75.00/month per URL $100.00/month per URL
2-10 $60.00/month per URL $75.00/month per URL
11+ On Request On Request

Standard: Email alerts are sent only to the customer.

Premium: Alerts are sent to DOSarrest 24/7 NOC who will investigate, diagnose, confirm, troubleshoot the issue and notify and advise the customer via email.


  • Save one month's service charges if prepaid one year in advance.
  • SMS alerts add $5.00/month per URL.

For more information contact