Comment on Randomly getting ECH errors on self-hosted services.

bobslaede@feddit.dk ⁨4⁩ ⁨months⁩ ago

• Darkassassin07@lemmy.ca ⁨4⁩ ⁨months⁩ ago

  I do have external acces to Ombi via cloudflare; but the device I’m seeing this problem on is permanently connected to a VPN hosted from the same server machine as ombi/nginx with ‘block all connections without VPN’ enabled. And this testing has been done from within the same LAN.

  It should never see/reach cloudflare for this service.

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  • bobslaede@feddit.dk ⁨4⁩ ⁨months⁩ ago

    Try with nslookup and see if you’re resolving the domain to both your local ipv4 address, and the Cloudflare ipv6 at the same time. I am using pihole for my local DNS, and it would give me both my local address, and also the Cloudflare ipv6 address.

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    • Darkassassin07@lemmy.ca ⁨4⁩ ⁨months⁩ ago

      Crap, looks like that’s exactly what it is.

      Now how to fix that…

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    • Darkassassin07@lemmy.ca ⁨4⁩ ⁨months⁩ ago

      Added an AAAA record to pihole:

      ombi.mydomain.example 0000:0000::0000:0000

      Now nslookup returns the correct ipv4 address, and ‘::’ as the ipv6.

      We’ll see if that works.

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      • Darkassassin07@lemmy.ca ⁨4⁩ ⁨months⁩ ago

        That unfortunately did not work. I am only getting the ipv4 address now, but I still get the same ECH error in chrome 1/5 tries.

        Firefox now changed errors from ‘invalid certificate’ to ‘connection is insecure but this site has HSTS’. Still wont show the cert or provide any further info. (forgot to grab a screenshot before the below ‘solution’)

        I’m really annoyed at this point and have just disabled cloudflare proxying for this service. That seems to have sorted it for all browsers. I may look further later, I may just say fuck it and leave it like this. Gotta walk away for a bit.

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  • solrize@lemmy.world ⁨4⁩ ⁨months⁩ ago

    Can you verify with wireshark that the traffic is only going through your lan? I’m not hip enough for nginx but I used to have to run apache under gdb all the time to trace random errors from the server. That would be next, if the traffic is really local.

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    • Darkassassin07@lemmy.ca ⁨4⁩ ⁨months⁩ ago

      I’ll look into that next if what I’ve done doesn’t work. (see other comments)

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