[kwlug-disc] Puzzling network issue ...

[Anton Avramov]

Try curl with -i -vvvv switches. It might give more clues

On Thu, 2025-11-20 at 20:42 -0500, Khalid Baheyeldin wrote:
> I am having a puzzling issue with my VPN network, which uses
> Wireguard, and has been working well for months. 
> Then a few days ago, things started going wrong.
> 
> A service (e.g. Home Assistant, Grafana) would load from my phone,
> but fails to load from my laptop.
> My phone and my laptop are peers in the Wireguard VPN.
> 
> The issue does not seem to be a firewall issue, because I have not
> changed that at all, and I do see responses, but no traffic.
> 
> When I use curl, I get back a response, which is an HTTP redirect:
> 
> $ curl s1.example.com:3000
> 
> <a href="/login">Found</a>. 
> 
> But when I go to that URL, the browser (or curl) hangs there
> indefinitely.
> 
> $ curl s1.example.com:3000/login # Grafana, Hangs
> 
> $ curl s1.example.com:8123/ # Home Assistant, Hangs 
> 
> Again, some requests with errors do send back responses:
> 
> $ curl s1.example.com:8123/foo # Home Assistant, with an invalid URL
> 404: Not Found
> 
> But I do see bytes being queued in netstat on the target machine (3rd
> column).
> 
> tcp 0 5606 10.10.0.4:8123 10.10.0.2:50322 ESTABLISHED 4071/python3
> 
> Then it goes from ESTABLISHED to CLOSING to CLOSE_WAIT ...etc.
> 
> I restarted the Wireguard tunnels on both machines, just in case:
> 
> $ sudo systemctl status wg-quick at wg0
> 
> And it made no difference.
> 
> This is happening for various services, but only from specific
> machines, but not others.
> 
> How can one go about troubleshooting this pesky problem?
> -- 
> Khalid M. Baheyeldin
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