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Measurement Server Software Update

Thursday, 03 July 2014 by

We are about to update our measurement servers. Here’s the new line-up: iMacros 10.00.2738 iMacros “plugin” for Internet Explorer Firefox 29 iMacros for Firefox 8.8.1 Flash Java 7 Update 55 Silverlight 5.1.30214.0 There’s nothing to do on your side. However, if you think you are negatively affected, please contact support.   [Update] All

Database maintenance [Completed]

Wednesday, 18 June 2014 by

We are currently doing some database maintenance. No web performance transaction data will be lost even if historic data is temporarily not available in your account. Alerting is not affected! Update 6:32 pm EST: Maintenance completed – Thank you for your patience. PS: You can also review the status on our Public Status Dashboard – the

Waterfall charts are useful for getting information on very many web site / performance problems. Note that we at AlertFox generate the Waterfall charts  in HAR format using Fiddler which in some cases adds more information to the HAR files than a plain browser HTTP archive would do. To get you started with waterfall charts, we created a

US/EU Round-Robin Retries

Tuesday, 06 May 2014 by

Many of our users appreciate that we have a shared US/EU zone for transaction sensors. Some, however, told us that while a random distribution across the US and EU measurement servers is fine for making sure that customers on both sides of the Atlantic can indeed use their web app or site, it did not

How to Alert on a Group of Sensors

Thursday, 10 April 2014 by

Have you ever wanted to be able to receive an alert if one or more sensors are failing simultaneously? For example, let’s say you have three sensors monitoring some aspect of your site, and each sensor is configured to run in its own region. These sensors will already alert you if there is a problem

Synthetic vs Real User Monitoring

Tuesday, 08 April 2014 by

Let me start out by being honest. It seems every single post about this topic on the web is biased. Synthetic monitoring vendors highlight the advantages of synthetic monitoring, real user monitoring (RUM) vendors point out the advantages of RUM. And vendors that offer both, recommend to use both. At AlertFox we focus on having

Until today, the public dashboard graphs showed our standard performance graphs. But since last year we have the more informative multi-step charts available inside the AlertFox Control Center – and since today our public dashboards display these charts, too. The rule is simple: The standard performance graphs are still used if your transaction test does not contain

As some of you already have noticed, the Public Dashboard configuration panel sports a new “Apply Whitelist” column. This addition controls a new great feature allowing you to create a semi-public dashboard, e. g. a dashboard that is viewable only within your company network. If you do not plan to change your use of the Public

In order to ensure the quality of the back-end operations, AlertFox will be offline for a short period starting at 11:00am GMT on Thursday, March 6th.  Estimated downtime is 30-45 minutes. This will affect the user interface on as well as scheduled measurements and notifications. [Update] It took us a little longer than expected,

One of our colleagues is planning a trip to Brazil. She discovered that the website of the Brazilian Consulate in Munich has been inaccessible the whole weekend: (it works again by now). While it was down, the German version ( showed only the header, and the links in there lead again to 403 error. In other words…,