Hello, While it is pefectly legal to call libssh2_channel_forward_listen_ex with port=0, which will make SSH server assign first free port and return port assigned in last variable of the procedure, and this call works indeed, setting the mentioned variable to port assigned by remote server, somewhere down the road forwarding of this port fails.
When port gets allocated SSHd says: debug1: server_init_dispatch_20 debug1: server_input_global_request: rtype tcpip-forward want_reply 1 debug1: server_input_global_request: tcpip-forward listen 127.0.0.1 port 0 debug1: Local forwarding listening on 0.0.0.0 port 0. debug1: Allocated listen port 37840 debug1: channel 0: new [port listener] debug1: Local forwarding listening on :: port 37840. debug1: channel 1: new [port listener] And everything seems ok, as the last argument of libssh2_channel_forward_listen_ex is set to 37840. But then when trying to connect to port 37840 on the SSH server, I get: debug1: Connection to port 0 forwarding to 127.0.0.1 port 0 requested. debug1: channel 2: new [forwarded-tcpip] channel 2: open failed: administratively prohibited: Forward not requested debug1: channel 2: free: forwarded-tcpip: listening port 0 for 127.0.0.1 port 0, connect from 127.0.0.1 port 56883, nchannels 3 Note that "administratively prohibited" means "prohibited by the client". I've investigated it once for my own SSH packet (that does exactly the same as libssh2_channel_forward_listen_ex but disregards requested remote port altogether), and as far as I can remember the error is caused because of a mismatch between what got allocated (37830) and what libssh2 thinks the port is (0). I think it was somewhere in packet.c... If this got somehow fixed in newer releases, then sorry.
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