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Barracuda Web Security Gateway

Why can't I access a particular website even after exempting the IP on my Barracuda Web Filter?

  • Type: Knowledgebase
  • Date changed: one year ago
Solution #00001430

Scope:

Applies to Barracuda Web Filters deployed in forward proxy on all firmware versions.

 

Answer:

The Barracuda Web Filter is able to provide content filtering & security services by accepting proxy traffic. This means that the Barracuda Web Filter forwards the web request on the client’s behalf. Some domains do not accept or are unable to process proxy requests. This can be due to security reasons, such as HTTP-to-HTTPS redirection, secure authentication, or many other issues as described in RFC 3143 RFC #3143. In these situations, use the following procedure to exempt incompatible requests from being forwarded to the Barracuda:

 

For Edge/Chrome:

 

These browsers pull their configuration from the windows “Internet Options” page. To configure this:

      1. Open up Control Panel > Internet Options, click on Connections > LAN Settings. Select “Use a proxy server for your LAN”, and then click on Advanced.

      2. Click on “use the same proxy for all protocols", enter the Web Filters Address in the IP field, and "3128" into the port. (Version < 7.X will use 8080)

     3. Enter site name in the exception field in one of the following formatting rules:

 

        - Separate each entry with a semicolon

        - Use the star  character as a wildcard

        - Do not include http://

        - Do not include path or query information (ex. /cgi/calendar.cgi)

        - <IP>, where <IP> is the IP address of domain.com

     4. An example of a properly formatted Exemptions field for exempting google.com and all google subdomains:

 

         .google.com;google.com;173.194.

 

    5. If traffic is still being forwarded to the Web Filter, please check the web log to see what other domains are being accessed when attempting to use the problematic website. Enter any additional domains that are accessed in the Exemptions field until the page begins working.

 

For Internet Explorer version 8+:

 

    1. Open Internet Explorer, and go to Tools > Internet Options.

    2. Go to the Connection tab. Then click on the LAN Settings button. Check “Use a proxy server for your LAN”, and then click on “Advanced”

    3. Ensure that the Barracuda Web Filter’s IP/hostname is entered in the HTTP and Secure fields only, along with 3128 in the port field. (Version < 7.X will use 8080)

    4. Enter site name in the exception field in one of the following formatting rules:

 

        - Separate each entry with a semicolon

        - Use the star  character as a wildcard

        - Do not include http://

        - Do not include path or query information (ex. /cgi/calendar.cgi)

        - <IP>, where <IP> is the IP address of domain.com

 

    5. An example of a properly formatted Exemptions field for exempting google.com and all google subdomains:

 

         .google.com;google.com;173.194.

 

    6. If traffic is still being forwarded to the Web Filter, please check the web log to see what other domains are being accessed when attempting to use the problematic website. Enter any additional domains that are accessed in the Exemptions field until the page begins working.

 

For Firefox version 19+:

 

    1. Go to Tools > Options.

    2. Then, go to Advanced> Network > Settings.

    3. Fill in the field called No Proxy for: with your proxy exemptions following these formats:

 

        - Separate each entry with a semicolon

        - Use the star  character as a wildcard

        - Do not include http://

        - Do not include path or query information (ex. /cgi/calendar.cgi)

        - <IP>, where <IP> is the IP address of domain.com

 

    4. An example of a properly formatted Exemptions field for exempting google.com and all google subdomains:

 

         .google.com;google.com;173.194.

 

    5. If traffic is still being forwarded to the Web Filter, please check the web log to see what other domains are being accessed when attempting to use the problematic website. Enter any additional domains that are accessed in the Exemptions field until the page begins working.

    6. Alternately, Firefox can be configured to use system proxy settings as found in Internet Options. Follow instructions for Internet Explorer earlier in this solution if you choose this setting.

 Revised.

 

Link to This Page:
https://campus.barracuda.com/solution/50160000000GSBXAA4