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Open %JBOSS_HOME%serverdefaultdeployjboss-web.deployerserver.xml and change the port as per your requirement.

<Connector port="8081" address="0.0.0.0" maxThreads="250" maxHttpHeaderSize="8192"
        emptySessionPath="true" protocol="HTTP/1.1"
        enableLookups="false" redirectPort="8443" acceptCount="100"
        connectionTimeout="20000" disableUploadTimeout="true" />