in log4j-server/src/main/java/org/apache/logging/log4j/server/TcpSocketServer.java [238:240]
public TcpSocketServer(final int port, final int backlog, final InetAddress localBindAddress, final LogEventBridge<T> logEventInput) throws IOException {
this(port, logEventInput, new ServerSocket(port, backlog, localBindAddress));
}