Main Menu
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
SonicWall
  • Products
      All Products A–Z
      Free Trials
    • Network Security
      • Next-Generation Firewall (NGFW)
      • Network Security Services
      • Network Security Management
      • Secure SD-WAN
    • Threat Protection
      • Advanced Threat Protection Cloud
      • Advanced Threat Protection Appliance
      • Capture Labs
    • Secure Access Service Edge (SASE)
      • Zero-Trust Network Access (ZTNA)
    • Cloud Security
      • Cloud Firewall
      • Cloud App Security
    • Endpoint Security
      • Endpoint Detection & Response (EDR)
    • Email Security
      • Cloud Email Security
      • Hosted Email Security
      • On-Prem Email Security
    • Secure Access
      • Wireless Access Points
      • Network Switch
      • Virtual Private Network (VPN)
    • Wi-Fi 6 Access Points

      SonicWall SonicWave 600 series access points provide always-on, always-secure connectivity for complex, multi-device environments.

      Read More
  • Solutions
    • Industries
      • Distributed Enterprises
      • Retail & Hospitality
      • K-12 Education
      • Higher Education
      • State & Local
      • Federal
      • Healthcare
      • Financial Services
      • Carriers
    • Use Cases
      • Secure SD-Branch
      • Network Segmentation
      • Zero Trust Security
      • Secure SD-WAN
      • Office 365 Security
      • SaaS Security
      • Secure Wi-Fi
    • Solutions Widgets
      • Solutions Content Widgets
        Federal

        Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions

      • Solutions Image Widgets
  • Partners
    • SonicWall Partners
      • Partners Overview
      • Find a Partner
      • Authorized Distributors
      • Technology Partners
    • Partner Resources
      • Become a Partner
      • SonicWall University
      • Training & Certification
    • Partner Widgets
      • Custom HTML : Partners Content WIdgets
        Partner Portal

        Access to deal registration, MDF, sales and marketing tools, training and more

      • Partners Image Widgets
  • Support
    • Support
      • Support Portal
      • Knowledge Base
      • Technical Documentation
      • Community
      • Video Tutorials
      • Product Life Cycle Tables
      • Partner Enabled Services
      • Contact Support
    • Resources
      • Resource Center
      • Events
      • Free Trials
      • Blog
      • SonicWall University
      • MySonicWall
    • Capture Labs
      • Capture Labs
      • Security Center
      • Security News
      • PSIRT
      • Application Catalog
    • Support Widget
      • Custom HTML : Support Content WIdgets
        Support Portal

        Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials

      • Support Image Widgets
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
  • Contact Sales
  • English English English en
  • BLOG
  • CONTACT SALES
  • FREE TRIALS
  • English English English en
SonicWall
  • Products
      All Products A–Z
      Free Trials
    • Network Security
      • Next-Generation Firewall (NGFW)
      • Network Security Services
      • Network Security Management
      • Secure SD-WAN
    • Threat Protection
      • Advanced Threat Protection Cloud
      • Advanced Threat Protection Appliance
      • Capture Labs
    • Secure Access Service Edge (SASE)
      • Zero-Trust Network Access (ZTNA)
    • Cloud Security
      • Cloud Firewall
      • Cloud App Security
    • Endpoint Security
      • Endpoint Detection & Response (EDR)
    • Email Security
      • Cloud Email Security
      • Hosted Email Security
      • On-Prem Email Security
    • Secure Access
      • Wireless Access Points
      • Network Switch
      • Virtual Private Network (VPN)
    • Wi-Fi 6 Access Points

      SonicWall SonicWave 600 series access points provide always-on, always-secure connectivity for complex, multi-device environments.

      Read More
  • Solutions
    • Industries
      • Distributed Enterprises
      • Retail & Hospitality
      • K-12 Education
      • Higher Education
      • State & Local
      • Federal
      • Healthcare
      • Financial Services
      • Carriers
    • Use Cases
      • Secure SD-Branch
      • Network Segmentation
      • Zero Trust Security
      • Secure SD-WAN
      • Office 365 Security
      • SaaS Security
      • Secure Wi-Fi
    • Solutions Widgets
      • Solutions Content Widgets
        Federal

        Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions

      • Solutions Image Widgets
  • Partners
    • SonicWall Partners
      • Partners Overview
      • Find a Partner
      • Authorized Distributors
      • Technology Partners
    • Partner Resources
      • Become a Partner
      • SonicWall University
      • Training & Certification
    • Partner Widgets
      • Custom HTML : Partners Content WIdgets
        Partner Portal

        Access to deal registration, MDF, sales and marketing tools, training and more

      • Partners Image Widgets
  • Support
    • Support
      • Support Portal
      • Knowledge Base
      • Technical Documentation
      • Community
      • Video Tutorials
      • Product Life Cycle Tables
      • Partner Enabled Services
      • Contact Support
    • Resources
      • Resource Center
      • Events
      • Free Trials
      • Blog
      • SonicWall University
      • MySonicWall
    • Capture Labs
      • Capture Labs
      • Security Center
      • Security News
      • PSIRT
      • Application Catalog
    • Support Widget
      • Custom HTML : Support Content WIdgets
        Support Portal

        Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials

      • Support Image Widgets
  • COMPANY
    • Boundless Cybersecurity
    • Press Releases
    • News
    • Events
    • Awards
    • Leadership
    • Press Kit
    • Careers
  • PROMOTIONS
    • SonicWall Promotions
    • Customer Loyalty Program
  • MANAGED SERVICES
    • Managed Security Services
    • Security as a Service
    • Professional Services
  • Contact Sales
  • Menu

Website opens but images/content is distorted/not visible (red x)

03/26/2020 40 People found this article helpful 200,252 Views

    Download
    Print
    Share
    • LinkedIn
    • Twitter
    • Facebook
    • Email
    • Copy URL The link has been copied to clipboard

    Description

    CFS: Website opens but images/content is distorted/not visible (red x)

    Resolution

    Condition/Scenario 1: The site www.abc.com is visited. This site falls under the category 33, News and Media, which is one of the allowed categories. The site opens, but pictures/images/banners are replaced by a red X symbol.

    Condition/Scenario 2: The site www.abc.com is visited. This site falls under the category 33, News and Media, which is one of the allowed categories. The site opens partially with the message in the SonicWall log that “This site is being blocked by SonicWall CFS Category xx” (something other than 33).

     

     

    Resolution:

    1. Go to www.abc.com.
    2. In Internet explorer go to View -> Source. In Mozilla Firefox go to View -> Page Source
    3. In the resulting Notepad file, do a “Find” for “.com”.
    4. Note the sites that you find. Mostly 2 or 3 websites are repetitively found.
    5. Go to http://cfssupport.sonicwall.com/eng/index.jsp. In the Page that opens, you will find “Enter the URL you wish to view the rating for:” Enter the URL in the text box. Click on Submit. For e.g.: If you find www.def.com in Step 4, enter it in the text box and click on Submit. Repeat this step for each website found in Step 4.
    6. Note the Category that is returned.
      1. In SonicOS Standard firmware, go to Security Services-> Content Filter. Click on Configure. Go to “URL List” tab on the new page and cross-check if the Category found in Step 6 is enabled. If enabled then go to “Custom List” tab, add the url in the allowed domains. Make sure that Enable Allowed/Forbidden Domains is checked on the Custom List tab
      2. In SonicOS Enhanced firmware, go to Security Services-> Content Filter. Click on Configure. Go to “Policy” tab on the new page and click on Configure for the policy in question. Cross-check if the Category found in Step 6 is enabled in the “URL List”. If enabled then go to “Custom List” tab, add the url in the allowed domains. Make sure that Disable Allowed Domains is not checked on the Settings Tab. 
        For e.g.: Add def.com(from Step 5) to the Allowed domains list
    7. Go to Internet Explorer, clear the cache. Visit www.abc.com. All the images/content will be visible without any distortion.

     

    Real time Scenario

    1. Enable CFS on the LAN Zone
    2. Configure CFS default policy
    3. Enable Category 48 – MP3/Streaming.Click Ok.
    4. Note that Category 33 is not checked.                                                                                    
    5. Log Out of the Firewall
    6. Visit www.kfvs12.com which is a site falling under the category 33 
    7. It can be seen that some of the content is displayed, while many images are not displayed/distorted.
    8. The Logs below (Fig 4) indicate that CFS is blocking this website based on Category 48 whereas www.kfvs12.com comes under category 33.Obviously some of the Images are being hosted from another website which comes under the category 48(In this case its www.worldnow.com).
    9. Using the source code of the html page, we can find out the websites from which these images are being hosted. We can add these websites in the Allowed Domains. In the e.g.: Add worldnow.com in the Allowed Domains.
      1. In SonicOS Standard firmware, make sure that Enable Allowed/Forbidden Domains is checked on the Custom List tab.
      2. In SonicOS Enhanced firmware, make sure that Disable Allowed Domains is not checked on the Settings Tab
    10. Now visit www.kfvs12.com after logging out of the Firewall.
    11. All images are visible without any distortion

    Related Articles

    • Bandwidth usage and tracking in SonicWall
    • How to force an update of the Security Services Signatures from the Firewall GUI
    • Configure Guest VLAN in the TZ firewall, for guest users to access Internet only.

    Categories

    • Firewalls > TZ Series
    • Firewalls > SonicWall SuperMassive E10000 Series
    • Firewalls > SonicWall SuperMassive 9000 Series
    • Firewalls > SonicWall NSA Series

    Not Finding Your Answers?

    ASK THE COMMUNITY

    Was This Article Helpful?

    YESNO

    Article Helpful Form

    Article Not Helpful Form

    Company
    • Careers
    • News
    • Leadership
    • Awards
    • Press Kit
    • Contact Us
    Popular resources
    • Communities
    • Blog
    • SonicWall Capture Labs

    Stay In Touch

    • By submitting this form, you agree to our Terms of Use and acknowledge our Privacy Statement. You can unsubscribe at any time from the Preference Center.
    • This field is for validation purposes and should be left unchanged.
    • Facebook
    • Twitter
    • Linkedin
    • Youtube
    • Instagram

    © 2023 SonicWall. All Rights Reserved.

    • Legal
    • Privacy
    • English
    Scroll to top