Edit /opt/solr/bin/solr
Find the line with SOLR_START_OPTS and add the following after "-Djetty.port=$SOLR_PORT":
"-Djetty.host=localhost"
Mine looks like this:
SOLR_START_OPTS=('-server' "${JAVA_MEM_OPTS[@]}" "${GC_TUNE[@]}" "${GC_LOG_OPTS[@]}" \
"${REMOTE_JMX_OPTS[@]}" "${CLOUD_MODE_OPTS[@]}" \
"-Djetty.port=$SOLR_PORT" "-Djetty.host=localhost" "-DSTOP.PORT=$stop_port" "-DSTOP.KEY=$STOP_KEY" \
"${SOLR_HOST_ARG[@]}" "-Duser.timezone=$SOLR_TIMEZONE" \
"-Djetty.home=$SOLR_SERVER_DIR" "-Dsolr.solr.home=$SOLR_HOME" "-Dsolr.install.dir=$SOLR_TIP" \
"${LOG4J_CONFIG[@]}" "${SOLR_OPTS[@]}")
Someone also suggested adding it to the SOLR_HOST_ARG array earlier in the same file. You can try that:
SOLR_HOST_ARG+=("-Djetty.host=$SOLR_HOST")
I hope it helps!