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<p>try lowering your mtu to 1,200 from 1,500 to see if it helps</p>
<div class="moz-cite-prefix">On 2025-11-20 8:42 p.m., Khalid
Baheyeldin wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CA+TuoW0rhkE+kesF12470gh47_pvmcL47YKuAb2pikCPR2cjiQ@mail.gmail.com">
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<div style="font-size:small" class="gmail_default">I am having
a puzzling issue with my VPN network, which uses Wireguard,
and has been working well for months. </div>
<div style="font-size:small" class="gmail_default">Then a few
days ago, things started going wrong.</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default">A service
(e.g. Home Assistant, Grafana) would load from my phone, but
fails to load from my laptop.</div>
<div style="font-size:small" class="gmail_default">My phone
and my laptop are peers in the Wireguard VPN.</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default">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.</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default">When I use
curl, I get back a response, which is an HTTP redirect:</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">$ curl <a
href="http://s1.example.com:3000"
moz-do-not-send="true">s1.example.com:3000</a>
</span><br>
<a href="/login">Found</a>. <br>
</span></div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)"><br>
</span></span></div>
<div style="font-size:small" class="gmail_default">
<div style="font-size:small" class="gmail_default">But when
I go to that URL, the browser (or curl) hangs there
indefinitely.</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">$ curl </span></span><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)"><a
href="http://s1.example.com" moz-do-not-send="true">s1.example.com</a></span></span><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">:3000/login #
Grafana, Hangs</span><br>
</span><br>
</div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">$ curl </span></span><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)"><a
href="http://s1.example.com" moz-do-not-send="true">s1.example.com</a></span></span><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">:8123/ # Home
Assistant, Hangs </span></span></div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default">
<div style="font-size:small" class="gmail_default">Again,
some requests with errors do send back responses:</div>
<br>
</div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">$ curl </span></span><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)"><a
href="http://s1.example.com" moz-do-not-send="true">s1.example.com</a></span></span><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">:8123/foo #
Home Assistant, with an invalid URL</span><br>
</span></div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace">404: Not Found</span></div>
<br>
<div style="font-size:small" class="gmail_default">But I do
see bytes being queued in netstat on the target machine
(3rd column).</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">tcp 0 5606 <a
href="http://10.10.0.4:8123" moz-do-not-send="true">10.10.0.4:8123</a>
<a href="http://10.10.0.2:50322"
moz-do-not-send="true">10.10.0.2:50322</a>
ESTABLISHED 4071/python3</span><br>
</span><br>
</div>
<div style="font-size:small" class="gmail_default">Then it
goes from ESTABLISHED to CLOSING to CLOSE_WAIT ...etc.</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default">I
restarted the Wireguard tunnels on both machines, just in
case:</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default"><span
style="font-family:monospace"><span
style="color:rgb(0,0,0);background-color:rgb(255,255,255)">$ sudo
systemctl status wg-quick@wg0</span><br>
</span><br>
</div>
<div style="font-size:small" class="gmail_default">And it
made no difference.</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
<div style="font-size:small" class="gmail_default">This is
happening for various services, but only from specific
machines, but not others.</div>
<div style="font-size:small" class="gmail_default"><br>
</div>
How can one go about troubleshooting this pesky problem?</div>
</div>
<span class="gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="gmail_signature"
data-smartmail="gmail_signature">Khalid M. Baheyeldin</div>
</div>
<br>
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