Public bug reported:
This seems a regression from Ubuntu 17.10 OpenSSH 7.5.
Setting the SSH option ConnectTimeout=N only works on the first
ConnectionAttempts. So, if you set ConnectionAttempts=2 for example, it
will time out after N second on the first attempt and wait the full,
default TCP timeout on the second attempt.
Example of the error:
$ time ssh -vvvv -o ConnectTimeout=2 -o ConnectionAttempts=2 -o
StrictHostKeyChecking=false -o UserKnownHostsFile=/dev/null 1.2.3.4
OpenSSH_7.6p1 Ubuntu-4, OpenSSL 1.0.2n 7 Dec 2017
debug1: Reading configuration data /home/vide/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "1.2.3.4" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 1.2.3.4 [1.2.3.4] port 22.
debug2: fd 3 setting O_NONBLOCK
debug1: connect to address 1.2.3.4 port 22: Connection timed out
debug1: Trying again...
debug1: Connecting to 1.2.3.4 [1.2.3.4] port 22.
debug1: connect to address 1.2.3.4 port 22: Connection timed out
ssh: connect to host 1.2.3.4 port 22: Connection timed out
real 2m13,670s
user 0m0,012s
sys 0m0,018s
The first timeout happens after 2 seconds, the second after ~2 minutes
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: openssh-client 1:7.6p1-4
ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
Uname: Linux 4.15.0-34-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 16 10:48:41 2018
InstallationDate: Installed on 2017-11-20 (329 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
RelatedPackageVersions:
ssh-askpass N/A
libpam-ssh N/A
keychain N/A
ssh-askpass-gnome N/A
SSHClientVersion: OpenSSH_7.6p1 Ubuntu-4, OpenSSL 1.0.2n 7 Dec 2017
SourcePackage: openssh
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
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https://bugs.launchpad.net/bugs/1798049
Title:
ssh ConnectTimeout is obeyed only on 1st ConnectionAttempt
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