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<p>What about using GNUTLS_E_UNRECOGNIZED_NAME instead of GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER (in server_name.c / _gnutls_server_name_recv_params()) ?</p>
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<p dir="auto">IMO illegal_parameter is more appropriate here according to the RFC:</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"> illegal_parameter: A field in the handshake was incorrect or</span>
<span id="LC2" class="line" lang="plaintext"> inconsistent with other fields. _This alert is used for errors</span>
<span id="LC3" class="line" lang="plaintext"> which conform to the formal protocol syntax but are otherwise</span>
<span id="LC4" class="line" lang="plaintext"> incorrect._</span></code></pre>
<p dir="auto">and</p>
<pre class="code highlight js-syntax-highlight plaintext" lang="plaintext" v-pre="true"><code><span id="LC1" class="line" lang="plaintext"> unrecognized_name: Sent by servers when no server exists identified</span>
<span id="LC2" class="line" lang="plaintext"> by the name provided by the client via the "server_name" extension</span>
<span id="LC3" class="line" lang="plaintext"> (see [RFC6066]).</span></code></pre>
<p dir="auto">That would allow clients to distinguish whether the error is in protocol level or configuration level.</p>
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