https://bugzilla.mindrot.org/show_bug.cgi?id=3380
--- Comment #3 from Darren Tucker <dtuc...@dtucker.net> --- > OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d 10 Sep 2019 Firstly, you are using a vendor modified version of OpenSSH. Can you reproduce the problem with the stock source from openssh.com? I can't tell timings from those traces, but the first two are showing two different behaviours from the remote server: > ssh -vvv -o ConnectTimeout=30 -p 443 u...@srvsysssh.com [...] > debug1: connect to address 94.86.175.299 port 443: Connection timed out > ssh: connect to host srvsysssh.com port 443: Connection timed out The server fails to establish a TCP connection within 30s. > $ ssh -vvv -o ConnectTimeout=150 -p 443 u...@srvsysssh.com > OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d 10 Sep 2019 [...] > debug1: Connection established. > debug3: timeout: 29987 ms remain after connect [...] > debug1: Local version string SSH-2.0-OpenSSH_7.9p1 Debian-10+deb10u2 > ssh_exchange_identification: Connection closed by remote host Assuming the transcription is correct, the connection takes ~120s to come up, then the TCP connection is established but the server does not reply to the SSH banner and instead closes the connection after some amount of time I cannot determine (but presumably a bit less than 30 seconds later). The third trace looks ok from what you have shown. Given you're using port 443, is it possible there's a transparent web proxy in the path? or one of those HTTPS/SSH multiplexers? Where are the significant delays and how long are they? FWIW your examples work for me both with the stock OpenSSH and a Debian I happen to have handy (albeit on port 22, which is what the server is on): $ ssh -V OpenSSH_7.9p1 Debian-10+deb10u2, OpenSSL 1.1.1d 10 Sep 2019 -- You are receiving this mail because: You are watching someone on the CC list of the bug. You are watching the assignee of the bug. _______________________________________________ openssh-bugs mailing list openssh-bugs@mindrot.org https://lists.mindrot.org/mailman/listinfo/openssh-bugs