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

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 ⁨1⁩ ⁨month⁩ 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 ⁨1⁩ ⁨month⁩ ago
  Crap, looks like that’s exactly what it is.
  
  Now how to fix that…
  
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- Darkassassin07@lemmy.ca ⁨1⁩ ⁨month⁩ 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 ⁨1⁩ ⁨month⁩ 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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    bobslaede@feddit.dk ⁨1⁩ ⁨month⁩ ago
    You should change to use cname in pihole. I will write up on my computer later for you.
    
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solrize@lemmy.world ⁨1⁩ ⁨month⁩ 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 ⁨1⁩ ⁨month⁩ ago
  I’ll look into that next if what I’ve done doesn’t work. (see other comments)
  
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