yeye I have read the html warning when signing up. I disabled it but seems outlook has two switch options. One for sending, one for viewing. Hopefully it is correct this time. Sorry for the (html) noise. Anyways: Hi, I have set up a ssh tunnel. It works fine, but under load it disconnects after a while. On the client side I get stuff like:? "channel 0: rcvd too much data 1448, win 0/2097152 (excess 209960)" Usually there are lots of those message after another, but they don't immediately lead to a disconnect. After a while though the tunnel is disconnected with "disconnecting 1.2.3.4 port 4321: channel 0: peer ignored channel window" So this indicates the issue is on the server side? On the sshd server side I often see: "debug1: channel 0: datagram too big" I guess those are related? Are these ssh specific datagrams or is some kind of UDP traffic meant? The traffic where this happens is usually TCP though.? Any ideas what could be the reason? Any config options to change? Can firewall options block some ssh specific messages? I did already play around with MTU but this did not really change anything. Can it be a MTU issue at all? At least for other software like wireguard you sometimes need to change the MTU or else there will be connectivity problems (but no complete disconnects). Software in question is usually some recent Linux distro (Ubuntu, Fedora) with some 9.* openssh version. Alternatively, is there some way to force a reconnect with ssh itself??