Don’t sweat it, our vAC™ system can keep your servers online. We are the first provider who can specialise in vAC™ protected servers internationally scaling to meet demand and protecting your assets from being offline due to a server overload. Ensure your most important customers get to your website, promotions and products.
vAC™ allows operators to isolate the effects of a Denial of Service (DOS) page flood attacks so that even under extreme traffic levels, the applications are never overwhelmed ensuring the continued availability of your services.
HTTP error 503 – Service unavailable. Most of us came across this error. Error 503 happens because of large number of requests on the server at a given time. It is a server side error means nothing’s wrong with your computer, its all about web server. The web server is simply not available for your request so it shows error 503. Sometimes some popular, bigger websites links to smaller websites causing a large amount of traffic flowing to the smaller one. Which causes improper working of its web server. The slowdown of web server due to sudden and unexpected heavy traffic. This is known as Slashdot effect.
This error 503 can be avoided by our vAC™ software. vAC™ is load balancing software. The vAC™ works on web server to manage the traffic that is coming towards it. vAC™ queues all the traffic so that server can respond to each request and so there will be no server overloading error. So now its easy to have an error free server with our vAC™ software. There won’t be any more error 503`s as they will now be a thing of the past.
Visitors to the website are identified by the presence of a vAC™ session cookie. If the cookie is not present it will be added after prioritisation has taken place. Every visitor is given a unique identifying number that will be used to track the user through all stages of vAC™ processing.
As many levels of prioritisation as required are available with .com™ and changes are quick and easy. The prioritisation level for a given user is set based on a configurable and orderable set of policies. The information available to make a priority level setting are: IP address, geographical location, referring URL and target URL. External instructions via an API can also set the priority level for a specific user.
For every priority level there are 3 activation states. These are “Allow”, “Queue”, and “Overload”. Policies are used to determine how many visitors can be allowed on the web server at any one time for the given priority level. These policies take three factors into consideration: total number of visitors, total number of connections and server response times. Provided all three are within limits the visitor will be allowed and will have access to the website. Once the visitor has be granted access to the website that access will be guaranteed provided they re-access the site within a configurable time period. If the visitor cannot be allowed access to the website they will either be queued, provided the maximum queue size has not be reached, or overloaded. Queuing results in the visitor receiving an automatically refreshed web page showing their position in the queue, estimated queuing time and any customisable static content required. As places become available visitors are moved from the queue to the “Allow” state. Overloading results in the visitor receiving a web page of customisable static content that can be used to provide call back or voucher functions.
The priority level policies that control activation states are constantly being monitored and can be automatically modified to adapt to changing circumstances and visitor levels. For example, if a high priority level is subject to queuing and a lower priority level is not, visitor numbers allowed at lower priority levels can be reduced and the higher one increased. Server response times are constantly monitored to prevent this from affecting the quality of service enjoyed by those already on the website at the higher priority level. As visitor levels decrease the policies are automatically returned to their original levels.