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Barracuda Web Security Gateway

How to Block FTP and Other Non-HTTP Standard Protocols

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You can choose to block or allow applications that communicate over non-HTTP or HTTP protocols, such as applications like Skype or BitTorrent, or standard protocols like FTP or SSH. Depending on the granularity of blocking that you need, use either  the BLOCK/ALLOW > Applications page or the BLOCK/ALLOW > Exceptions page as follows:

  • To block either all Authenticated or Unauthenticated users, use the BLOCK/ALLOW > Applications page.
  • To block ALL users or a specific user or group of users, such as users who authenticate with LDAP or Kerberos, or an IP group or Local Group, use the BLOCK/ALLOW > Exceptions page.

Note that application blocking is only available for inline deployments. To follow along with the examples below, log in as Usernameadmin  Password:  admin 

Example 1. Block all FTP protocol traffic for Unauthenticated Users.

  1. Click on the BLOCK/ACCEPT > Applications page. 
  2. At the upper right, for Policy, select Unauthenticated.
  3. In the Applications section, under Allowed Applications, de-select the check boxes, leaving only the Standard Protocols category selected.
  4. Click on Standard Protocols to see the list of protocols.
  5. Select  FTP, and then click BLOCK>> under Blocked Applications on the right side of the page.

    FTPBlock.png

  6. FTP should appear in the Blocked Applications list. Click Save.

Example 2. Block all FTP protocol traffic for Students local group.

  1. Go to the USERS/GROUPS > Local Groups page and create a group called Students.
  2. From either the USERS/GROUPS >  Account View or USERS/GROUPS > New Users pages, add users to the Students group.
  3. Click on the BLOCK/ACCEPT > Exceptions page. 
  4. For Action, select Block.
  5. For Applies To, select Local Group. From the drop-down to the right, select Students.
  6. For Exception Type, select Applications.
  7. For Application Name, click S to bring Standard Protocols to the top of the list. Scroll to find and click on FTP in the Standard Protocols list.
  8. Select other attributes for the exception such as Time Frame, for example, if desired.
  9. Click Add. Your new exception to block all FTP traffic for the Students group appears in the List of Exceptions further down the page.

FTPException.png

Example 3. Block SSH traffic for all Kerberos users

  1. Go to the USERS/GROUPS > Authentication page. Configure a Kerberos authentication server on the Kerberos tab.
  2. Click on the BLOCK/ACCEPT > Exceptions page. 
  3. For Action, select Block.
  4. For Applies To, select Kerberos and, from the drop-down, select the Kerberos server. In this example, the server name is QA2K8.COM.
  5. For Exception Type, select Applications.
  6. For Application Name, click S to bring Standard Protocols to the top of the list. Scroll to find and click on SSH in the Standard Protocols list.
  7. Select other attributes for the exception such as Time Frame, for example, if desired.
  8. Click Add. Your new exception to block all SSH traffic for all Kerberos-authenticated users appears in
    the List of Exceptions further down the page.

SSHBlock.png

 

 

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