<diagnostics>
    <diagnostic xmlns="http://www.loc.gov/zing/srw/diagnostic/">
        <uri>info:srw/diagnostic/1/1</uri>
        <details>
            <url>http://sru.vls.io/bth?operation=searchRetrieve&amp;query=rec.identifier%3D12345&amp;recordSchema=mods</url>
            <headers><header name="ACCEPT" value="*/*"/><header name="ACCEPT-ENCODING" value="gzip, br, zstd, deflate"/><header name="CONNECTION" value="close"/><header name="COOKIE" value="session_id=0d3813366ce993ecae87ffa0d307cd874a84a503"/><header name="HOST" value="sru.vls.io"/><header name="Remote-Addr" value="172.17.0.5"/><header name="USER-AGENT" value="Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"/><header name="X-FORWARDED-FOR" value="216.73.216.189"/><header name="X-FORWARDED-PORT" value="443"/><header name="X-FORWARDED-PROTO" value="https"/><header name="X-FORWARDED-SSL" value="on"/><header name="X-REAL-IP" value="216.73.216.189"/></headers>
            <params><param name="operation" value="searchRetrieve"/><param name="query" value="rec.identifier=12345"/><param name="recordSchema" value="mods"/></params>
            <additional><name>FetchFromZ3950Failed</name><hint>Failed to fetch data from underlying Z3950 interface</hint><msg>failed to establish Z3950 zoom connection</msg><exception>ConnectionError: ('socket', '[Errno 111] Connection refused')
</exception><provider>bth</provider><protocol>Z39.50</protocol><mdrevision>0</mdrevision><host>134.130.184.19</host><port>3950</port><database>sisis</database><encoding>iso5426</encoding><recordSyntax>MAB</recordSyntax><targetRecordSyntax>MODS</targetRecordSyntax><area>searchRetrieve.fetchRecords</area></additional>
            </details>
        <message>An error has occured: FetchFromZ3950Failed - failed to establish Z3950 zoom connection [ConnectionError: ('socket', '[Errno 111] Connection refused')
]</message>
    </diagnostic>
</diagnostics>