On Fri, Jan 26, 2018 at 5:02 AM, Darren Tucker <dtucker@xxxxxxxxxxx> wrote: > On 26 January 2018 at 06:44, Adrian Pascalau <adrian27oradea@xxxxxxxxx> > wrote: >> >> [...] >> debug1: SSH2_MSG_KEXINIT sent [preauth] >> >> Here the debug mode stops, and there is no login prompt shown on the >> Putty window. > > > This behaviour is often caused by a path MTU/fragmentation problem. > > If you run "netstat" on both client and server and find the SSH TCP > connection you should see a "Send-Q" column. This column is the number of > bytes in the TCP socket buffer that the other end has not acknowledged. If > it is non-zero number that remains above zero or increases then IP > fragmentation is likely your problem and you need to fix whatever in your > environment is causing that. Darren, thanks for your reply. In the ssh client side, I have a windows host that runs Putty. So I installed a new centos to be able to see the "Send-Q" column, since the windows netstat does not have it. Surprise, the ssh connection works like a charm. I went back to the windows box to try again with Putty, and I have the same issue. So could this be because of windows? I cannot suspect Putty, since I tried this with another windows based ssh client (MobaXterm), and the same issue happens. _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
