this post was submitted on 22 Jan 2024
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Curious issue... OpenDNS hijacking Twitter? (zerobytes.monster)
submitted 11 months ago by [email protected] to c/[email protected]
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The original was posted on /r/sysadmin by /u/jnievele on 2024-01-21 13:53:31+00:00.

I'm using PiHole, and among others I use OpenDNS as resolver... today I noticed the Twitter client on a tablet acting strangely, and after some checking the Twitter webpage failed to load due to a HSTS error.

This seemed rather strange, so I checked the Certificate - and noticed it was issued by OpenDNS, with a CN "Cisco Umbrella Secondary SubCA fra-SG"

Disabling OpenDNS fixed the issue, but WTF is going on there? Why would OpenDNS try to hijack traffic?

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