In the midst of a DDoS attack, the presence of invalid SSL certificates might be noticed. This occurrence stems from the L7 filter's alteration of the SSL certificate and can be addressed by installing the correct SSL certificate for the dedicated IP.

Impact of Invalid SSL Certificates During DDoS Attacks:

  1. L7 Filter Modification: The L7 filter, during DDoS attacks, can modify the SSL certificate, rendering it invalid. This compromises the integrity of secure communication.

  2. Resolution with Valid SSL Certificate: The solution involves installing the appropriate SSL certificate for the dedicated IP, restoring the authenticity and security of communication.

  3. Visible Only to Filtered Visitor IPs: The presence of the invalid certificate is only apparent to visitor IPs filtered by the system.

Practical Mitigation Measures:

  1. Installation of Valid SSL Certificate: Ensure the correct SSL certificate is installed for the dedicated IP, assuring the authenticity of communication during DDoS attacks.

  2. Targeted Monitoring: Keep a watchful eye on filtered visitor IPs, ensuring prompt identification and resolution of SSL certificate invalidation.


The existence of invalid SSL certificates during DDoS attacks can result from the interference of the L7 filter, impacting the security of online communication. Proper installation of the SSL certificate for the dedicated IP is essential to address this issue and maintain the integrity of communication, serving as a crucial practice in environments susceptible to DDoS attacks.

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