Monthly Archives: May 2010

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