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CISA Releases Protective DNS Resolver Shared Service

The US Cybersecurity and Infrastructure Security Agency (CISA) has made its Protective Domain Name System available to all federal civilian agencies through CISA’s Cybersecurity Shared Services Office. In a blog post, CISA writes, “Protective DNS shields federal users and organizations from reaching known or suspected malicious destinations with a cutting-edge capability that safeguards network connections. It also empowers FCEB agencies with better visibility into their own internet traffic, providing real-time logs, reports and other insights into an ever-evolving cyber threat landscape.”


  • Having a service which black-holes known bad DNS entries helps reduce the success of attacks and reach ability of C2 services, akin to Einstein. As with any such service, you should monitor for interruption of legitimate traffic and understand how to both add services which are banned and/or how to revert to your existing configuration.


Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook

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