Block Social Networking Websites by Web Content Filter

Web Content Filter is a license-required service using URL categorization service from CYREN for filtering the websites. The service allows the router to learn which kind of website the client is trying to access, and enables Network Administrator to control the access to all the URLs of corresponding category, without specifying each of their URL. This article demonstrates how to use the Web Content Filter of Content Security Management to block all the social networking websites.

1. Add a new WCF profile: Go to CSM >> Web Content Filter Profile,

  1. Make sure the Web Content Filter license is activated.
  2. Click on an available index to add a new profile.
a screenshot of Web Content Filter profile list

2. Configure the WCF profile as follows:

  1. Enter a profile name, here we use Social Network
  2. Set Action to “Block”
  3. Select the category of websites you would like to block, the category of a website can be checked from Here we choose “Social Networking”.
a screenshot of DrayOS Web Content Filter profile

3. To filter the HTTPS websites as well, adding a DNS Filter is required. DNS Filter is an extension of URL Content Filter and Web Content Filter to make sure the HTTPS (encrypted) websites will also be filtered. DNS Filter allows Network Administrator to block or pass the DNS queries that contain specific keywords, thus to control the access to HTTPS websites. Go to CSM >> DNS Filter, and click on a profile index.

a screenshot of DrayOS DNS Filter list

4. Edit the DNS profile as follows,

  1. Enter Profile Name
  2. Select WCF as the Web Content Filter Profile created in Step 2
  3. Click OK to save
a screenshot of DrayOS DNS Filter

5. To apply the Web Content Filter and DNS Filter, go to Firewall >> Filter Setup >> Set 2, and click on a Filter Rule number

  1. Enable the Filter Rule
  2. (Optional) Edit Source IP if you would like to apply this policy to some of the LAN hosts, or you may just leave it as "Any" if you would like to apply the filter rule to all theLAN host.
  3. Select Filter as "Pass Immediately"
  4. Select Web Content Filter as the profile created in Step 2
  5. Select DNS Filter as the profile created in Step 3
  6. Click OK to save
a screenshot of DrayOS Firewall Filter Rule

6. After finishing the above settings, all the social networking websites will be blocked by Web Content Filter and DNS Filter with Vigor Router, even if the website uses HTTPS.

a screenshot of a browser open facebook but showing this webpage is not available

How to make a social networking website to bypass the rule?

If there's a website you would like to allow access but it belongs to the social networking category, you may add its URL into the White List of Web Content Filter profile. Below we take "" for example.  

an illustration of most of socail websites are blocked except for Linkedin

1. Go to Objects Setting >> Keyword Object, create an object and enter the keyword of that website's URL in Contents.

a screenshot of DrayOS Keyword object settings

2. Edit the Web Content Filter profile as follows,

  1. Enable White/Black List
  2. Set Action to "Pass"
  3. Click Edit and select the Keyword Object created in the previous step.
  4. Click OK to save the profile.

3. Now, the LAN clients will be able to visit even if it's categorized as a Social Networking website.

a screenshot of DrayOS Web Content filter profile


If Web Content Filter does not work as expected, please check the following items:

  • Clear browser's cookie and history.
  • Clear the DNS cache on the computer.
  • Make sure the computer's default gateway is Vigor Router.
  • Check the DNS server of the computer: If the server is an internal DNS server, please make sure the internal DNS server's gateway is set to Vigor Router. If the server is your Vigor Router, please enable DNS Filter Local Setting in CSM >> DNS Filter instead of a Firewall Rule, and please note that DNS Filter Local Setting will apply to all LAN clients who use the router as DNS server.

1. Make sure your Content Filter License is activated. Go to Objects Setting >> Web Category Object >> Content Filter License, and check if the status of license is enabled.

a screenshot of Vigor3900 Content Filter Licenset

2. Go to Object Setting >> Web Category Object >> Web Category Object. After activating the Web Content Filter service via “Content Filter License”, click Add in the “Web Category Object” to start.

a screenshot of Vigor3900 Web Category Object list

3. Enter a profile name, and choose the categories you want to filter. Here we choose Social Networking. Then, click Apply to save the profile. (Note: We can check out which category a website belongs to by visiting

a screenshot of Vigor3900 Web Category Object

4. Go to Firewall >> Filter Setup >> URL/Web Category Filter, and click Add.

a screenshot of Vigor3900 Web Category Filter list

5. Type a Profile name, check Enable, and select "Enable" for Filter https. Check the profile created in the previous step in policy > Web Category Block. Then, click Apply to save the settings.

a screenshot of Vigor3900 Web Category Filter profile

6. (Optional) To apply this firewall only at a specific time (e.g., working hours), at Time Schedule, create a Time Object specifying the time you'd like to apply this rule and select the object.

a screenshot of Vigor3900 Web Category Filter profile

7. (Optional) To apply this firewall only to specific IP range (e.g., the employee's IP), at Source IP, create a Source IP Object specifying the IP range need to follow this rule and enable it.

a screenshot of Vigor3900 Web Category Filter profile

8. Now, LAN clients should see the message below when they try to access a networking website, such as Facebook.

a screenshot of a browse showing facebook was blocked

Published On: 2018-01-25 

Was this helpful?   

book icon

Related Articles