Hi,
I have the following problem(s).
I use my machine (Slack 9.1) to log into another machine (also running Slack 9.1) via ssh.
So I type something like ssh -lusername localmachine.hostname.com and get logged in.
When I am logged in, if I am editing a command of a file (pico textfile) the console oftenly hangs.
Ctrl+c doesn't work. I suppose this issue is liked to the following problem.
When i am logged into ssh, provided the console is still working, I try to transfer a file via scp.
scp username@username.com:/filename /home/username/
Transferring works, but at 30k/s and after a few secons it gets to 0.8 k/s until it stops, and this happens although between my machine and the machine I log into there is a 5mb/s bandwidth (!!!).
I suppose this has something to do with ssh, and so does the console hanging maybe. Please tell me anything you might consider usefull.

The transfer doesn't actually slow down; it is ssh's way of calculating the average transfer speed that creates the illusion. The transfer most probably stops as a whole.

I had similar problem few months ago; my reason was a broken network cable, that was strained too much from junction under the door.

Also changing the /proc/sys/net/ipv4/tcp_ecn to 0 or 1 might do something.