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Tomcat should accept requests on port 8080, but only from localhost, and redirect to the SSL port 6443:

<Connector port="8080" protocol="HTTP/1.1"

               connectionTimeout="20000"

               redirectPort="6443" />

Configure port 6443:

    <Connector port="6443" protocol="org.apache.coyote.http11.Http11NioProtocol"
               maxThreads="150" SSLEnabled="true" scheme="https" secure="true">
        <SSLHostConfig clientAuth="none" sslProtocol="TLS" sslEnabledProtocols="TLSv1.3,TLSv1.2"
               honorCipherOrder="true" ciphers="TLS_AES_256_GCM_SHA384,TLS_AES_128_GCM_SHA256,
               TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
               TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256">
            <Certificate certificateKeystoreFile="/opt/shrine/shrine.keystore"
                         certificateKeystorePassword="changeit"
                         certificateKeyAlias="*.catalyst.harvard.edu" />
        </SSLHostConfig>
    </Connector>

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