As you can see I get error message when I try to create another tunnel listening on local port that is already used but the tunnel is created. Can I force ssh to not create tunnel on given port when there is another process that is using given port?
┌─[wakatana@~] [79 files, 89Mb]
└──> ps -elf | grep 'ssh -fN'
1 S wakatana 4263 1 0 80 0 - 10660 - May02 ? 00:00:00 ssh -fN -L 5901:localhost:5901 root@MY.PUB.IP.ADDR
0 S wakatana 6340 4754 0 80 0 - 1959 - 00:22 pts/7 00:00:00 grep --color=auto ssh -fN
┌─[wakatana@~] [79 files, 89Mb]
└──> ssh -fN -L 5900:192.168.1.1:3389 root@MY.PUB.IP.ADDR
┌─[wakatana@~] [79 files, 89Mb]
└──> ps -elf | grep 'ssh -fN'
1 S wakatana 4263 1 0 80 0 - 10660 - May02 ? 00:00:00 ssh -fN -L 5901:localhost:5901 root@MY.PUB.IP.ADDR
1 S wakatana 6371 1 0 80 0 - 10355 - 00:22 ? 00:00:00 ssh -fN -L 5900:192.168.1.1:3389 root@MY.PUB.IP.ADDR
0 S wakatana 6381 4754 0 80 0 - 1959 - 00:22 pts/7 00:00:00 grep --color=auto ssh -fN
┌─[wakatana@~] [79 files, 89Mb]
└──> ssh -fN -L 5900:192.168.1.3:3389 root@MY.PUB.IP.ADDR
bind: Address already in use
channel_setup_fwd_listener: cannot listen to port: 5900
Could not request local forwarding.
┌─[wakatana@~] [79 files, 89Mb]
└──> ps -elf | grep 'ssh -fN'
1 S wakatana 4263 1 0 80 0 - 10660 - May02 ? 00:00:00 ssh -fN -L 5901:localhost:5901 root@MY.PUB.IP.ADDR
1 S wakatana 6371 1 0 80 0 - 10355 - 00:22 ? 00:00:00 ssh -fN -L 5900:192.168.1.1:3389 root@MY.PUB.IP.ADDR
1 S wakatana 6391 1 0 80 0 - 10355 - 00:23 ? 00:00:00 ssh -fN -L 5900:192.168.1.3:3389 root@MY.PUB.IP.ADDR
0 R wakatana 6401 4754 0 80 0 - 1958 - 00:23 pts/7 00:00:00 grep --color=auto ssh -fN