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<p>Hi, <br>
</p>
<p>Port 4500 is the IPSec UDP nat port and 500 is IKE.</p>
<p>Anyconnect uses ISPEC so I think those ports are simply in use.</p>
<p><br>
</p>
<p>--John<br>
</p>
<div class="moz-cite-prefix">On 24/09/19 9:36 PM, <a class="moz-txt-link-abbreviated" href="mailto:wireguard@p-np.de">wireguard@p-np.de</a>
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1394974820.30160.1569317808871@office.mailbox.org">
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<div> Hello, </div>
<div> <br>
</div>
<div> in place upgrades from iOS 12 -> iOS 13 (release) seem to
work well in general. But there is a bizarre issue depending on
<strong>remote</strong> endpoint ports. If you have, in my case,
4500/UDP configured as remote endpoint the tunnel does not send
or receive traffic. Changing it to any other port works.
Changing back to 4500/UDP breaks it again reproducibly. For
others, documented <a
href="https://www.reddit.com/r/WireGuard/comments/d6in39/wg_broken_on_ios_13/"
moz-do-not-send="true">here</a> , it is 1500/UDP, in
#WireGuard there has been a documented issue for 500/UDP not
working. </div>
<div> <br>
</div>
<div> I have AnyConnect installed in parallel and checked, whether
that's related. But removing and resetting Network settings did
not fix port 4500 for me. </div>
<div> <br>
</div>
<div> As there is no port number dependent branching in the
WireGuard-iOS code base, this is likely an iOS regression. Does
any one of you have a working channel to Apple to report this? </div>
<div> <br>
</div>
<div> Thank you for an else excellent product. Let me know if I
can be of any help. </div>
<div> <br>
</div>
<div> Best regards, </div>
<div> <br>
</div>
<div> Christian </div>
<br>
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