Uptime Uptime is the period of time when a site performs well.

Uptime corresponds to the time when a site is accessible from the Internet. The opposite term - downtime - shows for how long a site has not been working during specified period of time. Usually uptime is measured in percents, and for period of time is choosen year. Percents over the year could be easily transformed into time values. Some typical values of uptime and corresponding period of unavailability during the year are shown here:

90% - 876 hours

99% - 87 hours, 36 minutes

99.9% - 8 hours, 45 minutes, 36 seconds

99.99% - 52 minutes, 34 seconds

So high uptime is really important. Even if it seems that 99% is pretty high value - it corresponds to several days of failure. If that happens in a row, many clients can be lost. Uptime value is usually guaranteed by web hosting, where the site is hosted. Website Monitoring may help you to increase the uptime and check if the value, declared by the hosting company, is real.

  • CM.Glossary.WebsiteMonitoring
  • CM.Glossary.Downtime
  • CM.Glossary.WebHosting
  • CM.Glossary.Availability
more glossary

Service is very  reliable and performs as described in sales information.  User interface is simple and easy to use.

- St
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.

more blog
Sign In
Sign Up
Prices & packages
Our monitoring network
Home > FAQ > monitoring
I set my site to be checked every 1 (10, 30 etc) minutes, however I see only 1 record in logs for a day. Why?
Note that adjacent checks with the same result (all show Ok or all fail) stack into a single record in logs by default. Pay attention to columns "Check cnt." and "Interval" in the log. "Check cnt." shows how many checks have been made for the specified interval. It is done to make logs less bulky. However, you may turn on "Full log" option for your tasks - in this case all checks are saved separately. You may select this option while creating or editing a task.
Can I insert a list of sites for monitoring?
While creating a new monitoring task click "Add list" near the URL field. Then insert into the extended field the list of sites, each one from the new line.
How to add more sites for monitoring?
Sign in at www.host-tracker.com and on the main page and click "Add", for web sites click on http. Then fill regular task creation form.
Does HostTracker affect my analytics?
HostTracker does not execute any javascripts while checking your sites. So, if you use external monitoring tool, like Google Analytics, these checks are not counted. However, if you use some internal monitoring system - HostTracker requests will be logged. In this case you may exclude checking servers by IP. List is here.
How to check CONTENT with HostTracker?
Visit this link for detailed instructions: Content Check.
Does HostTracker support HTTPS monitoring?
Yes, HostTracker has full https support. Certificate-related errors are reported as well as usual http error codes.
Where can I find the list of HostTracker IPs?
IP addresses of all HostTracker servers are in this list. Note that the list may change over the time, as HostTracker network grows.
Send to Twitter Send to Facebook Send to LinkedIn Share on Google+
HostTracker blog HostTracker page on Facebook