[EchoServer] WARN io.netty.bootstrap.ServerBootstrap - Unknown channel option 'SO_BACKLOG' for channel '[id: 0x130de1e0]'
[nioEventLoopGroup-4-1] INFO io.netty.handler.logging.LoggingHandler - [id: 0x130de1e0] REGISTERED
[nioEventLoopGroup-4-1] INFO io.netty.handler.logging.LoggingHandler - [id: 0x130de1e0] BIND: local:netconf
[nioEventLoopGroup-4-1] INFO io.netty.handler.logging.LoggingHandler - [id: 0x130de1e0, L:local:netconf] ACTIVE
[pool-8-thread-1] INFO org.opendaylight.netconf.shaded.sshd.common.util.security.bouncycastle.BouncyCastleGeneratorHostKeyProvider - generateKeyPair(EC) generating host key=nistp521
[nioEventLoopGroup-6-1] WARN org.opendaylight.netconf.shaded.sshd.client.keyverifier.AcceptAllServerKeyVerifier - Server at /127.0.0.1:10831 presented unverified EC key: SHA256:P0ECyJ87JhRVc8H4oCe5jx8HrhYRqd4dGqY2nW49s7A
[pool-8-thread-1] INFO org.opendaylight.netconf.shaded.sshd.server.session.ServerSessionImpl - Session a@/127.0.0.1:53650 authenticated
[nioEventLoopGroup-3-1] INFO org.opendaylight.netconf.northbound.ssh.EchoClientHandler - channelActive
[nioEventLoopGroup-4-1] INFO io.netty.handler.logging.LoggingHandler - [id: 0x130de1e0, L:local:netconf] READ: [id: 0x3813174b, L:local:netconf ! R:local:E:5a80a8d5]
[nioEventLoopGroup-4-1] INFO io.netty.handler.logging.LoggingHandler - [id: 0x130de1e0, L:local:netconf] READ COMPLETE
[nioEventLoopGroup-5-1] INFO org.opendaylight.netconf.northbound.ssh.EchoServerHandler - writing back '[a;127.0.0.1:53650;ssh;client;]
ahoj
'
[nioEventLoopGroup-3-1] INFO org.opendaylight.netconf.northbound.ssh.EchoClientHandler - >[a;127.0.0.1:53650;ssh;client;]
ahoj

[nioEventLoopGroup-6-2] WARN org.opendaylight.netconf.nettyutil.handler.ssh.client.AsyncSshHandler - UNNAMED: Unable to setup SSH connection on channel: [id: 0x8784727f]
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: /0.0.0.0:12345
Caused by: java.net.ConnectException: Connection refused
	at java.base/sun.nio.ch.Net.pollConnect(Native Method)
	at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:672)
	at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:946)
	at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:337)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:339)
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:776)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:833)