protected Socket createCustomClientSocket(HostAndPort addr) throws IOException {
    throw new UnsupportedOperationException(
        "custom client socket factory is not supported by this socket creator");
  }
reimplement this method to use a custom socket factory to create and configure a new
client-side socket

@return the socket, or null if no custom client socket factory is available
geode-tcp-server/src/main/java/org/apache/geode/distributed/internal/tcpserver/AdvancedSocketCreatorImpl.java