Category Archives: How to block websites

How to block facebook at work of network computers?

Facebook is a social utility that connects people with friends and others who work, study and live around them. However, employees might spend too much time on this website during working hours.


This tutorial will guide you to setup an internet policy to block facebook access at work with WFilter 3.3 version.


You can block facebook access at different levels:



  1. Block facebook website completely.
  2. Allow facebook website, but block facebook chatting.
  3. Allow facebook website, but block facebook applications and games.

1. Block facebook website completely


1). Block facebook website by “Website Black/White List”.


Add “*.facebook.com” into a website black list.


Now HTTP access of facebook will be blocked.


2). Block https facebook by “HTTPS Black/White List”


Since facebook also provide https access, for complete blocking, you also need to block https facebook by “HTTPS Black/White List”.


Add “*.facebook.com” into a HTTPS black list.



Please notice, reopening of your browser is required for the HTTPS black list to work.


2. Block facebook IM chatting


You may use WFilter to block “facebook IM” directly in “Blocking Level Settings”->”Messengers”.



You will not be able to send a message when facebook IM is blocked.



3. Block facebook applications and games


Facebook applications and games will be blocked simply by adding “apps.facebook.com” into a website black list.




More information, please check “WFilter Enterprise”.


Other related links:


How to block internet downloading?
How to monitor internet usage on company networks?
Internet monitoring software for business
How to filter web surfing?
How to block websites and restrict internet access?
How to block HTTPS websites on my network?


How can I block tor or other similiar application?

1. What is tor ?

Tor is a system intended to enable online anonymity, composed of client software and a network of servers which can mask information about users’ locations and other factors which might identify them. Use of this system makes it more difficult to trace internet traffic to the user, including visits to Web sites, online posts, instant messages, and other communication forms. It is intended to protect users’ personal freedom, privacy, and ability to conduct confidential business, by keeping their internet activities from being monitored. The software is open-source and the network is free of charge to use.

Since client workstations can use tor to bypass internet filtering, so you may want to block tor traffic in your network.

In this tutorial, we will guide you to block tor traffic with “WFilter
Enterprise 3.3″.

2. How to block tor with Wfilter?

Because tor uses HTTP/TLS to encrypt its traffic, we need to use “HTTPS black/white list” feature of WFilter to filter HTTPS websites to block tor.

First, create a new “HTTPS White List” and add the allowed HTTPS domains in it. As in below figure:


Enable “HTTPS black/white list” in certain blocking level settings.

Finally, apply this blocking policy to certain computers.

3. Now tor will be completely blocked.


Blocking events in WFilter:

More information, please check “WFilter Enterprise”.

Other related links:

How to block
internet downloading?

How
to monitor internet usage on company network?

Internet
monitoring software for business

How to filter web
surfing?

How to block websites and restrict internet access?
How to block HTTPS websites on my network?

How to add a logo image into WFilter blocking page?

WFilter blocking denial page presents a blocking message to blocked users when a web page is blocked. Sometimes, you may want to add your logo image into WFilter blocking denial page.

This tutorial will guide you to add a logo image with “WFilter Enterprise 3.3″.

1. It is simple to add your logo when you have a website with this image. As you can see in below figures, just click “Add image” and input your logo url when editing a denial page.

2. However, if you don’t have an available website, you need to upload your image file to WFilter “image” directory for WFilter to find it. Please follow below steps:
1). Copy your image file to “www/image” directory of WFilter.
2). Click “Add image” in certain denial page, please notice you need to input full url address of your logo here. For example, if the IP address of WFilter computer is “192.168.1.20″, you need to input “http://192.168.1.20:9090/image/yourlogo” here. Do not use “http://localhost:9090/image/yourlogo”.

Webpage being blocked:

3. If you’re familiar with HTML code, you also can edit the
denial page source manually in “config/Denypage” directory of WFilter.

More information, please check “WFilter Enterprise”.
Other related links:
How to block internet downloading?
How to monitor internet usage on company network?
Internet monitoring software for business
How to filter web surfing?
How to block websites and restrict internet access?

How to block HTTPS websites on my network?

Hypertext Transfer Protocol Secure (HTTPS) is a combination of the Hypertext Transfer Protocol with the SSL/TLS protocol to provide encryption and secure (website security testing) identification of the server. It uses port 443. HTTPS connections are often used for payment transactions on the World Wide Web and for sensitive transactions in corporate information systems.
As more and more websites provide both HTTP and HTTPS access. For example, facebook.com can be access both from “http://www.facebook.com” and “https://www.facebook.com”. So you can not block facebook completely until both http and https are blocked. However, HTTPS are widely used in payment transactions, web email authentication …, so block all HTTPS traffic will not be a good choice.

“WFilter Enterprise” provides you a “HTTPS black/white List” for you to filter HTTPS websites by its domain name.

First, enable “HTTPS Black/white List”.


Second, add HTTPS domains in the black list.

More information, please check “WFilter Enterprise”.
Other
related links:
How to block
internet downloading?

How
to monitor internet usage on company network?

Internet
monitoring software for business

How to filter web
surfing?

How to block websites and restrict internet access?
How to Block Bittorrent and bitcomet?
How to block msn file transfer?
How to block certain websites to save your productivity?
How to block AIM using WFilter?

How to block BBC online video with WFilter?

One customer reported that BBC online video can not be blocked by WFilter, even “Block Online HTTP Video and Downloading of Video Files” is checked in certain blocking levels.
So we did some research and found, other than HTTP protocol, the BBC websites also use the RTMP (Real Time Messaging Protocol) to play online video.
Because blocking of RTMP is not supported by default in WFilter(will be added soon), this tutorial will guide you to block BBC online video by the “Customize Protocols” feature of WFilter.

First, Add a new protocol named “RTMP”.


1. Protocol Settings:
Protocol Name: RTMP
Protocol Desc: Real Time Messaging
Protocol Type: Streaming

2. Pattern1
Name: RTMP_HTTP
Desc: RTMP_HTTP
Type: HTTP SEND
Offset: 0
Format: User-Agent
Content: Shockwave\sFlash

3. Pattern2
Name: RTMP
Desc: RTMP
Type: TCP_SEND
Offset: 0
Begin Byte: 03
Format: 0
Content: \x03[\x00-\xff]{4}\x80\x00

Second, Enable blocking of RTMP in certain blocking levels.

Now, BBC videos will be successfully blocked.

Related Topic: How to block bbc iplayer?

How to restrict employees internet access on your network?

Internet can be a benefit to business when used properly, but internet
is often abused by employees and poses significant liability and
security risks. Used
improperly, the Internet can subject every organization to harassment claims,
countless hours of lost productivity and innumerable security leaks and
vulnerabilities.

Several important risks caused by improper internet usage:
1. Virus Infection
2. Lost Productivity
3. Legal liability
4. Bandwidth consumer

So it is necessary for you to restrict employees internet access on your network.

To achieve this goal,  first you need an internet access policy, which should be able to:

1. Clarify what constitutes acceptable use of Internet services.
2. Ensure employees understand who to contact with questions regarding acceptable use.
3. Ensure employees understand the penalties that arise from Internet misuse.
4. Help lessen an organization’s spyware and virus infestation rates.
5. Provide human resources with signed documentation from each employee stating a pledge not to improperly use Internet services.
6. Help mitigate productivity losses.
7. Decrease dependence upon technology solutions used to enforce employee behavior.
8. Reduce the organization’s liability resulting from harassment claims, copyright violations originating onsite and other illegal acts.

You also need an internet filtering product to assure your internet policy. Let’s take “WFilter Enterprise” as an example, it enables you to monitor and filter internet access for all computers from a mirroring port of your switch. You only need to install WFilter in one computer to monitor the whole network.

Key Features:

  • Keep a detailed record of each web surfing and web posting.
  • Record all incoming and outgoing email content and attachment.
  • Monitor and archive instance messengers chat contents and activities.
  • Monitor and archive files transferred by web, ftp and IM tools.
  • Implement a policy to filter internet access during working hours.
  • Websites, messengers and p2p file downloading can be blocked to save bandwidth and raise productivity.
  • You only need to install WFilter in ONE computer to manage your whole network.

http://www.imfirewall.us

How to block facebook game using WFilter?

Sometimes you may want to block facebook games during working hours. This tutorial will guide you to block facebook games using “WFilter Enterprise”.

First, add a website black list.


Second, choose this website black list in certain blocking policy.


Third, apply this blocking policy to certain computers.


Now, facebook game is blocked.

How to block bbc iplayer on company network?

BBC iPlayer (formerly known as Integrated Media Player (iMP), Interactive Media Player, and MyBBCPlayer) is an internet television service, P2P, cable television, and several mobile devices developed by the BBC to extend its existing RealPlayer-based “Radio Player” and other streamed video clip content.

As online iPlayer may consume much internet bandwidth, this tutorial will guide you to block BBC iPlayer using WFilter. We suppose WFilter is already properly installed and is capable of monitoring/blocking other computers, if not, please read How to monitor internet usage on company network first.

WFilter’s “website black list” is based on website domains, so we can not use “website black list” to block iPlayer, since iPlayer is a subfolder of www.bbc.co.uk without a individual domain. However, we still can use “URL Keywords Filtering” feature to block url with certain keywords.

The below example demonstrates blocking of url with keyword “iplayer”.

1. Create a blocking policy, and enable “URL Keywords Filtering”.


2. Choose “Streaming Media” category and click the edit icon to edit its keywords list.


Please notice: WFilter already has some default keywords(the default
keywords are hidden). For example, “video” is already included in the
“Streaming Media” category. If you only want to block “iplayer”, you can add a new category in “Category Settings”->”Customize Categories” of WFilter.

In this example, we need to add “iplayer” to the keywords list:

3. Apply this blocking policy to certain computers.

4. By now, urls with keywords “iplayer” will be blocked.

More information, please check “WFilter Enterprise”.
Other related links:
How to block internet downloading?
How to monitor internet usage on company network?
Internet monitoring software for business
How to filter web surfing?
How to block websites and restrict internet access?
How to Block Bittorrent and bitcomet?
How to block msn file transfer?
How to block certain websites to save your productivity?
How to block AIM using WFilter?

Blocking adapter doesn’t work when using two network cards with WFilter.

Some switches does not allow outgoing traffic on a mirroring port. In this case, WFilter needs a separate blocking adapter to send blocking packets. And if you’re monitoring and filtering more than 100 computers, we recommend you to use a different blocking adapter as the monitoring adapter.

When the two network cards are installed, we will want the Windows system to use the blocking adapter to access your network. However, sometime the Windows system might pick up the monitoring adapter and fails to connect to your network. This problem can be resolved by the “Automatic Metric” setting in Windows.

A metric is a value that is assigned to an IP route for a particular
network interface that identifies the cost that is associated with
using that route. The Automatic Metric feature is configured independently for each network interface in the network. This feature is useful in situations where you have more than one
network interface of the same speed, for example, when each network
interface has been assigned a default gateway. In this situation, you
may want to manually configure the metric on one network interface, and
enable the Automatic Metric feature to configure the metric of the
other network interface. This setup can enable you to control the
network interface that is used first in the routing of IP traffic.

In our case, the “Automatic Metric” of the blocking adapter shall be smaller than the monitoring adapter. So by setting “Automatic Metric” of the blocking adapter to “1″, and the monitoring adapter to “2″, Windows system will use the blocking adapter to access your network.

How to setup ip-mac binding in WFilter?

You may assign static ip addresses to computers manually or in your DHCP server. However, it is difficult to prevent users from changing their ip addresses or mac addresses. Though it is more reasonable to setup ip-mac binding in routers or switches, software solution is also a good option, as it is easier to setup and manage.

This tutorial will guide you to bind ip addresses to mac addresses in WFilter, an internet filtering and monitoring software product.

First, you need to setup a mirror port in your switch to do monitoring.
For how to deploy internet monitoring and filtering, check this guide: How to monitor internet usage?

Second, in “Control Settings”->”IP Management” of WFilter, you can setup ip-mac binding just by a few clicks.

i
When ip-mac binding is setup, internet access will be blocked when the user tries to change ip address or mac address.

Please notice: “ip-mac binding” feature of WFilter only works for single segment networks. It is because the real MAC addresses of computers can not be retrieved  in a multiple-segments network.