vAC Service - NetPrecept


Revolutionary Web Traffic Management Software from NetPrecept

Worried your web server will crash under the strain?

Ever heard of the Slashdot or the Stephen Fry effect where a website can crash under the huge pressure caused by a surge of unexpected visits? How about the horror of Google deindexing you just because they can’t see your website? It happens to the biggest brands, what are you doing to protect from it?

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.


What is vAC™?

vAC™ is the revolutionary web traffic management software from NetPrecept. This unique, patented technology ensures the best possible performance from your website.


High value customers, window shoppers and those with malicious intent can be identified and managed.


Your most important users receive the best possible online experience, prioritise key website functions during times of peak demand.


vAC™ allows you to control admissions to your website so an infinite number of users can be held in the queue.


Configure how your website manages different users and levels of traffic through your dashboard (in development), setup unlimited scenario policies.

Why do I need it?

See the difference vAC can make for your website

Reduce additional servers

Increase your margins by eliminating the need for “just in case” infrastructure, keeping your systems working at optimum capacity. vAC™ is more cost-effective than scaling online systems that are designed to cope with occasional peaks in demand.

Real time response to traffic load

vAC™ uniquely identifies online visitors and manages them according to predetermined, automated priorities. These can be over-ridden by powerful manual controls allowing a real-time response to traffic load or capacity shortage problems by shifting priorities and allowing queuing.

Best customer experience

vAC™ allows you to pre-define the priority of user groups. If your site crashes you lose all your customers. vAC™ maintains the best possible level of service to your highest priority users at all times. This can ensure real spenders get access rather than window shoppers.

Inform your customers

Provide your clients with a superior service even during very busy periods, maintaining and enhancing your hard-earned brand reputation and the need to repair the negative impact of a crashing site reported on social media. Prevent your site from crashing during traffic spikes and turn it into a positive promotional experience with the opportunity of cross-selling and up-selling.

Prevent DOS attacks

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.

Are you a service provider?

  • Reduce your data centre costs.
  • Increase the utilization of your servers, “even virtual servers are finite”.
  • Increased revenue and higher margins when offering as Software as a Service (SaaS).
  • Improve the reliability of sites for high profile/one-off projects where website failure is not an option.
  • Individual sites can be protected even when multi-hosted.

E-Commerce and B2C:

Prioritise your most valuable customers and protect your brand reputation.

Travel & Hospitality:

Facilitate outstanding customer service; ensure your customers use the website as the first port of call.

Online Betting and Casinos:

Manage “spike intensity” and prioritise your “high rollers”.

Entertainment & Ticketing:

Satisfy demand no matter how popular the event and manage queuing with advanced “sorry services”.

Contact Centres:

Ensure your customers queries are managed through online channels, minimizing costs.

Media & Content:

Respond to the buzz and ensure your customers return time after time.

How to avoid error 503

HTTP error 503 – Service unavailable. Most of us came across this error. Error 503 happens because of a 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 the web server. The web server is simply not available for your request so it shows error 503. Sometimes some popular, bigger websites link 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 the 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.




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How does it work?

See how the vAC system works for you


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 is 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: the 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 been 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 a callback 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.