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An issue with ServerSocketChannel::supportedOptions including the IP_TOS socket is reported here. http://mail.openjdk.java.net/pipermail/nio-dev/2018-August/005365.html It seems that the ServerSocketChannel has had partial support for IP_TOS since JDK 8u40 as a result of JDK- 8029607. The option can be set but cannot be read. The references to IP_TOS should be removed from ServerSocketChannelImpl. The following test, maybe test/jdk/java/nio/channels/etc/PrintSupportedOptions.java demonstrates the issue: /** * @test * @run PrintSupportedOptions * @run main/othervm -Djava.net.preferIPv4Stack=true PrintSupportedOptions * import java.io.IOException; import java.net.SocketOption; import java.nio.channels.DatagramChannel; import java.nio.channels.NetworkChannel; import java.nio.channels.ServerSocketChannel; import java.nio.channels.SocketChannel; public class PrintSupportedOptions { @FunctionalInterface interface NetworkChannelSupplier<T extends NetworkChannel> { T get() throws IOException; } public static void main(String[] args) throws IOException { test(() -> SocketChannel.open()); test(() -> ServerSocketChannel.open()); test(() -> DatagramChannel.open()); } static void test(NetworkChannelSupplier supplier) throws IOException { try (NetworkChannel ch = supplier.get()) { System.out.println(ch); for (SocketOption<?> opt : ch.supportedOptions()) { System.out.format(" %s -> %s%n", opt.name(), ch.getOption(opt)); } } } }