Пассивный мониторинг
Пассивный Мониторинг Пассивный мониторинг - это способ проверить работу сайта с помощью определенного программного обеспечения на стороне сервера.

Пассивный мониторинг - это способ проверить работу сайта с помощью определенного программного обеспечения на стороне сервера. В процессе может создаваться точная копия входного трафика, или же использоваться непосредственно реальный трафик. Пассивный мониторинг может собирать статистику и следить за некоторыми важными параметрами - например, потребление трафика, количество посетителей и т.д. Также, это удобный способ проанализировать, как пользователи работают с Вашим сайтом. Тем не менее, только ошибки на стороне сервера могут быть обнаружены в этом случае. В случае обрыва соединения с Интернетом, или же других сетевых ошибок, пассивный мониторинг этого не заметит - он показывает состояние сервера, который в это время вполне может продолжать нормально работать. Вы заметите спад количества посетителей, но это трудно зафиксировать сразу. Это и есть основное отличие между Пассивным Мониторингом (на стороне сервера) и Активным Мониторингом (внешним).

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Shellshock vulnerability check
Considering the recently discovered Shellshock vulnerability, HostTracker has created a tool for testing it.
Check your server for vulnerability

How does it work?

It is developed for a Linux server with a web server installed on it. The algorithm is very simple. We consequently generate 4 http requests:

  • 1. Ordinary request
  • 2. The request tries, using vulneratility, post a "harmful" cookie which causes 2-seconds delay in respond to our special http request.
  • 3. The request tries, using vulneratility, post a "harmful" cookie which causes 4-seconds delay in respond to our special http request.
  • 4. Same as #3

Results of the test

How to understand the result?

We compare response time for all 4 requests. Three situation are possible:

  • 1. Vulnerability found. We may affirm that if the difference in responses is about 2 seconds for requests without cookie and with 2-second-delay cookie, as well as for requests with 2 and 4-second delay cookie. It means that our request was able to use the vulnerability and set these cookies.
  • 2. Vulnerability not found. All the requests have about the same response time. The cookies, likely, were not installed because there is no vulnerability.
  • 3. Uncertain situation. If the response time differs widely, without coincidence with preset by cookies delay, we can not say for sure. It could be if the server is under high load. To check this, we use two requests with same cookies (#3 and #4). If the response time for two same checks varies, we make a conclusion that the response time is not affected by cookies. At least, not only by them. So in this case our method can not detect vulnerability

Safety of checks

Our test can not damage your server. The risk consists of appearance of one extra-cookie, which is used only for our requests and can not affect normal work-flow of your site.

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HostTracker — Sites Monitoring Service (English)
Every site owner knows how important it is to have your resource always operative and available for visitors. Periodical site unavailability has a bad influence even at its positions in the search engines (as Google representatives have repeatedly claimed), not to mention the fact that visitors are extremely displeased by such “accidents”...

How to be always aware of how properly your site is operated in real time?

HostTracker is an online website monitoring service, having rich functionality and good feedback of the customers, who are, by the way, more than 25 thousand (including the resources of such companies as Colgate, KasperskyLab, Panasonic etc.).

The job design of this service is the following: at certain specified intervals your websites and servers will be checked for availability and serviceability (the verification is performed from around the world), and in case of any problems you will receive notifications about the problems. In addition, uptime statistics for each site is collected, but it will be discussed later.

A quick site serviceability check may be performed directly from the service main page through typing its address in the upper right window and selecting one of the verification methods:

  • Http – website pages loading check
  • Ping – the server availability check (pinging)
  • Trace – the server availability check (tracing)
  • Port – random server port check

According to the check results a detailed report will be created on a separate page.

To become the HostTracker service client and verify the uptime and serviceability of your resources on a regular basis you need to register in the system and assign the appropriate tasks. Over time detailed statistical reports and visual graphics will be created for each task, greatly facilitating data analysis, outputing them in an understandable representative form.

Site failures and problems may be reported to (at your option):

  • Email as a letter
  • telephone as an SMS or a call
  • Skype or GTalk as a message

At that it is possible to set the notifications delay, their uploading time etc. – the settings are very flexible. By the way now I really miss such functionality at Monitorus, as it sends an SMS immediately when a problem occurs, regardless of the time of day, and as you can imagine, late night may be very fun because of this).

Another useful feature of the HostTracker service is the site content monitoring. You may set a list of the page keywords, at the disappearance of which you will receive the notification. Or vice versa – set a list of words, at the appearance of which you will receive the notification. The first case, for example, is good for paid links on other sites monitoring, and the second – to prevent virus activity in the form of additional code embedding on your website. Say, it is very helpful and very convenient!

Now a few words about the HostTracker site monitoring service rates prices. There are several service plans, differing in the maximum tasks number, check frequency, etc. However, there is also a full-featured trial period of 30 days, as well as the Free tariff, within which you may monitor up to two resources with an interval of 30 minutes. That’s not much of course, but as an option to try out all the features for free, and then decide on the appropriateness of the paid tariff transition, it is just the job. Good luck!

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