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<a href="https://gitlab.com/pfg666">Paul</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1233#note_574085248">commented</a>:
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<p dir="auto">I opened a similar <a href="https://github.com/eclipse/californium/issues/1620" rel="nofollow noreferrer noopener" target="_blank">issue for Scandium</a>, which also exhibited this behavior. From the discussions I had there, it appears the DTLS 1.2 RFC may provide some ground for accepting ClientHello messages with increased message sequence numbers based on the <a href="https://www.rfc-editor.org/rfc/rfc6347.html#page-18" rel="nofollow noreferrer noopener" target="_blank">quote</a>:</p>
<blockquote dir="auto">
<p>If a server receives a ClientHello with an invalid cookie, it SHOULD
treat it the same as a ClientHello with no cookie. This avoids
race/deadlock conditions if the client somehow gets a bad cookie
(e.g., because the server changes its cookie signing key).</p>
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<blockquote dir="auto">
<p>Note to implementors: This may result in clients receiving multiple
HelloVerifyRequest messages with different cookies. Clients SHOULD
handle this by sending a new ClientHello with a cookie in response to
the new HelloVerifyRequest.</p>
</blockquote>
<p dir="auto">If this is indeed the reason for accepting such ClientHellos, then I think the issue can be closed. I am leaving this issue open to to ensure the behavior is intended (a dev may close it if that is the case), as it does appear to be a bit of an edge case.</p>
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