Availability
Availability Availability of a site shows if a site is accessible from the Internet.

Availability of a site shows if a site is accessible from the Internet. This term is also about access to a server, database or another entity. As all objects in the Internet are based on comlicated infrastructure, nothing can be available always. The question is how to measure it, what is normal and if we may affect it anyway. The measurement of availability is connected to terms Uptime and Downtime, which show for how long a site is unavailable. However, these values can not create the full view of the situation. There could be many reasons of unavailability - server or connection problems, application error, overload of the site and so on. To avoid or shorter the failures, it is needed to supervise the site and analyze the errors, if they happen. For these purposes there are special monitoring tools, which help to increase to availability of the site, collect statistics and provide necessary information about the errors for fast repair. These tools are called Website Monitoring services.

  • CM.Glossary.WebsiteMonitoring
  • CM.Glossary.Downtime
  • CM.Glossary.Uptime
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"Your monitoring service is the best to know exactly what is going on in our website. Thank you very much for your time and very good service."
- F.
Shellshock vulnerability online 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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Qom, Iran, Islamic Republic of Working
Farrokh Shahr, Iran, Islamic Republic of Working
Hyderabad, Telangana, India Working
Helsinki, Finland Working
Amsterdam, Netherlands Working
Sydney, Australia Working
Dublin, Ireland Working
Bucharest, Romania Working
Prague, Czech Republic Working
Tehran, Iran, Islamic Republic of Working
Freemont, United States Working
Zurich, Switzerland Working
Sofia, Bulgaria Working
Tehran, Iran, Islamic Republic of Working
Berlin, Germany Working
Brescia, Italy Working
Novokuznetsk, Russian Federation Working
Kochi, Kerala, India Working
Luxembourg, Luxembourg Working
Tehran, Iran, Islamic Republic of Working
Shiraz, Iran, Islamic Republic of Working
Mashhad, Iran, Islamic Republic of Working
Paris, France Working
Singapore, Singapore Working
Tokyo, Japan Working
Ulaanbaatar, Mongolia Working
Tehran, Iran, Islamic Republic of Working
Tehran, Iran, Islamic Republic of Working
Victoria, Seychelles Working
Stockholm, Sweden Working
Dnipro, Ukraine Working
Minsk, Belarus Working
Cheyenne, WY, United States Working
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Zhejiang, China Working
Tehran, Iran, Islamic Republic of Working
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Dublin, Ireland Working
Gibraltar, Gibraltar Working
Moscow, Russian Federation Working
Hangzhou, China Working
Manassas, VA, United States Working
Yekaterinburg, Russian Federation Working
Orlando, FL, United States Working
Rasht, Iran, Islamic Republic of Working
Mexico City, Mexico Working
Kuala Lumpur, Malaysia Working
New York, NY, United States Working
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Mykolaiv, Ukraine Working
Santa Ana, Costa Rica Working
Lansing, MI, United States Working
Hamedan, Iran, Islamic Republic of Working
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Patras, Greece Working
Budapest, Hungary Working
Tabriz, Iran, Islamic Republic of Working
London, United Kingdom Working
Amsterdam, Netherlands Working
Novosibirsk, Russian Federation Working
Tomsk, Russian Federation Working
Tehran, Iran, Islamic Republic of Working
Vladivostok, Russian Federation Working
Khmelnytsky, Ukraine Working
Bangkok, Thailand Working
Tehran, Tehran, Iran, Islamic Republic of Working
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London, United Kingdom Working
San Antonio, TX, United States Working
Seoul, Korea, Republic of Working
Amsterdam, Netherlands Working
Meppel, Netherlands Working
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Nuremberg, Germany Working
Sao Paulo, SP, Brazil Working
Tehran, Iran, Islamic Republic of Working
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Lenexa, Kansas, United States Working
Columbus, OH, United States Working
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Dronten, Netherlands Working
Moscow, Russian Federation Working
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Montreal, Canada Working
Los Angeles, CA, United States Working
London, United Kingdom Working
Singapore, Singapore Working
Moscow, Russian Federation Working
Paris, France Working
Gravelines, France Working
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Waco, TX, United States Working
Moscow, Russian Federation Working
Almaty, Kazakhstan Working
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Clarks Summit, PA, United States Working
Tehran, Iran, Islamic Republic of Working
Ballito, South Africa Working
Santa Fe de la Vera Cruz, Argentina Working
Melbourne, VIC, Australia Working
Strasbourg, France Working
Kyiv, Ukraine Working
Berlin, Germany Working
Kharkiv, Ukraine Working
Houston, TX, United States Working
Istanbul, Turkey Working
Kuala Lumpur, Malaysia Working
Belgrade, Serbia Working
Singapore, Singapore Working
Orlando, FL, United States Working
Amsterdam, Netherlands Working
Amsterdam, Netherlands Working
Quincy, WA, United States Working
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Amsterdam, Netherlands Working
Cheyenne, WY, United States Working
London, United Kingdom Working
Zurich, Switzerland Working
Istanbul, Turkey Working
Bucharest, Romania Working
Vilnius, Lithuania Working
Sofia, Bulgaria Working
San Antonio, TX, United States Working
Montreal, Quebec, Canada Working
Amsterdam, Netherlands Working
Dallas, TX, United States Working
Moscow, Russian Federation Working
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Kwun Tong, Hong Kong Working
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Belgrade, Serbia Working
Amsterdam, Netherlands Working
San Jose, CA, United States Working
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