In the current issue of HKCERT newsletter, HKCERT stated the incident of its web outage happened on 4 August.
The web server and the firewall were working normally. However, the firewall could not connect to the Trust Source to verify incoming IP addresses and as a result, all visiting IP addresses were untrustworthy. Thus, the firewall denied all access to the web server.
I applaud the gust of HKCERT in releasing the sensitive information and let all readers learn from the incident. If the same happens in bank or any other public organizations, I doubt whether such details can be made known to the public.
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