Failure when using port forwarding

[tyalie]

I'm currently trying to do port forwarding of another IP in the host network by using a reverse tunnel. I connected everything like how it is described and executed the command

ssh -L 1234:192.168.1.21:3389 -p 2222 ubuntu@127.0.0.1

The login is successful and the shell responsive. But by the time I try to connect to it over RDP on my client, the connection crashes with this error on the host side:

Failed to accept data channel: The association is closed
Failed to read from data channel stream closed
2019/07/23 16:13:56 main.go:220: disconnected

[aquahika]

Same here, It fails at forwarding VNC and iperf3 in my case.
But even on sending a long text on SSH shell (by Copy 'n' Paste), it happens as the same error message.
Maybe related to packet size or something is stuck?

[dsculptor]

This is the message on the ssh -vv terminal:

debug1: Connection to port 22001 forwarding to localhost port 80 requested.
debug2: fd 15 setting TCP_NODELAY
debug3: fd 15 is O_NONBLOCK
debug3: fd 15 is O_NONBLOCK
debug1: channel 5: new [direct-tcpip]
debug3: send packet: type 90

ssh_dispatch_run_fatal: Connection to 127.0.0.1 port 2222: message authentication code incorrect

This the message on client's dialing terminal:

Failed to push SCTP packet: Failed handling chunk: Failure handling SACK: SACK Cumulative ACK 3353202527 is older than ACK point 3353202528
Failed to accept data channel: The association is closed
Failed to read from data channel stream closed
2020/07/22 10:16:19 main.go:281: disconnected

@nobonobo : Can u point us in some direction to push a fix?