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[Bug 2114144] Re: Openssh Server ignores Port xxx

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Here is from a broken server running your version:

# /usr/lib/systemd/system/ssh.service
[Unit]
Description=OpenBSD Secure Shell server
Documentation=man:sshd(8) man:sshd_config(5)
After=network.target auditd.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Service]
EnvironmentFile=-/etc/default/ssh
ExecStartPre=/usr/sbin/sshd -t
ExecStart=/usr/sbin/sshd -D $SSHD_OPTS
ExecReload=/usr/sbin/sshd -t
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RestartPreventExitStatus=255
Type=notify
RuntimeDirectory=sshd
RuntimeDirectoryMode=0755

[Install]
WantedBy=multi-user.target
Alias=sshd.service

Here is mine which works, only thing I changed on ssh.service was the
path to the binary.

# /usr/lib/systemd/system/ssh.service
[Unit]
Description=OpenBSD Secure Shell server
Documentation=man:sshd(8) man:sshd_config(5)
After=network.target auditd.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Service]
EnvironmentFile=-/etc/default/ssh
ExecStartPre=/usr/local/sbin/sshd -t
ExecStart=/usr/sbin/sshd -D $SSHD_OPTS
ExecReload=/usr/sbin/sshd -t
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=on-failure
RestartPreventExitStatus=255
Type=notify
RuntimeDirectory=sshd
RuntimeDirectoryMode=0755

[Install]
WantedBy=multi-user.target
Alias=sshd.service

Here is from a server with your version, notice it is not listening to 443 even though I have it in the configuration:
# /usr/lib/systemd/system/ssh.socket
[Unit]
Description=OpenBSD Secure Shell server socket
Before=sockets.target ssh.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Socket]
ListenStream=22
Accept=no
FreeBind=yes

[Install]
WantedBy=sockets.target
RequiredBy=ssh.service

Here is from mine: # /usr/lib/systemd/system/ssh.socket
[Unit]
Description=OpenBSD Secure Shell server socket
Before=sockets.target ssh.service
ConditionPathExists=!/etc/ssh/sshd_not_to_be_run

[Socket]
ListenStream=22
Accept=no
FreeBind=yes

[Install]
WantedBy=sockets.target
RequiredBy=ssh.service

# /run/systemd/generator/ssh.socket.d/addresses.conf
# Automatically generated by sshd-socket-generator

[Socket]
ListenStream=
ListenStream=443
ListenStream=22

Notice it listens to port 443 as instructed.

>From your version, notice it fails to allocate an X11 domain display
socket:


● ssh.socket - OpenBSD Secure Shell server socket
     Loaded: loaded (/usr/lib/systemd/system/ssh.socket; enabled; preset: enabled)
     Active: active (running) since Wed 2025-06-11 17:27:13 PDT; 5 days ago
   Triggers: ● ssh.service
     Listen: [::]:22 (Stream)
      Tasks: 0 (limit: 76666)
     Memory: 8.0K (peak: 256.0K)
        CPU: 481us
     CGroup: /system.slice/ssh.socket

Jun 11 17:27:13 igloo systemd[1]: Listening on ssh.socket - OpenBSD
Secure Shell server socket.

● ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/usr/lib/systemd/system/ssh.service; disabled; preset: enabled)
     Active: active (running) since Thu 2025-06-12 03:42:51 PDT; 4 days ago
TriggeredBy: ● ssh.socket
       Docs: man:sshd(8)
             man:sshd_config(5)
    Process: 3371578 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS)
   Main PID: 3371579 (sshd)
      Tasks: 1 (limit: 76666)
     Memory: 4.9M (peak: 6.3M)
        CPU: 154ms
     CGroup: /system.slice/ssh.service
             └─3371579 "sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups"

Jun 13 17:32:56 igloo sshd[4120297]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Jun 14 15:44:35 igloo sshd[689282]: Accepted publickey for root from 50.251.249.49 port 54284 ssh2: RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA
Jun 14 15:44:35 igloo sshd[689282]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Jun 14 15:44:35 igloo sshd[689282]: error: Failed to allocate internet-domain X11 display socket.
Jun 15 16:44:51 igloo sshd[1231571]: Accepted publickey for root from 50.251.249.49 port 60884 ssh2: RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA
Jun 15 16:44:51 igloo sshd[1231571]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Jun 15 16:44:51 igloo sshd[1231571]: error: Failed to allocate internet-domain X11 display socket.
Jun 16 18:05:24 igloo sshd[1800016]: Accepted publickey for root from 50.251.249.49 port 54780 ssh2: RSA SHA256:a5bReJXl7L91eGOuCYugHsY2rn2a0WTDXEBTC93YdmA
Jun 16 18:05:24 igloo sshd[1800016]: pam_unix(sshd:session): session opened for user root(uid=0) by root(uid=0)
Jun 16 18:05:24 igloo sshd[1800016]: error: Failed to allocate internet-domain X11 display socket.

On mine this does not happen:

● ssh.socket - OpenBSD Secure Shell server socket
     Loaded: loaded (/usr/lib/systemd/system/ssh.socket; enabled; preset: enabled)
    Drop-In: /run/systemd/generator/ssh.socket.d
             └─addresses.conf
     Active: active (running) since Fri 2025-06-13 19:33:41 PDT; 2 days ago
   Triggers: ● ssh.service
     Listen: [::]:443 (Stream)
             [::]:22 (Stream)
      Tasks: 0 (limit: 8759)
     Memory: 12.0K (peak: 264.0K)
        CPU: 936us
     CGroup: /system.slice/ssh.socket

Jun 13 19:33:41 ubuntu systemd[1]: Listening on ssh.socket - OpenBSD
Secure Shell server socket.

● ssh.service - OpenBSD Secure Shell server
     Loaded: loaded (/usr/lib/systemd/system/ssh.service; enabled; preset: enabled)
     Active: active (running) since Fri 2025-06-13 19:33:47 PDT; 2 days ago
TriggeredBy: ● ssh.socket
       Docs: man:sshd(8)
             man:sshd_config(5)
    Process: 1593 ExecStartPre=/usr/local/sbin/sshd -t (code=exited, status=0/SUCCESS)
   Main PID: 1599 (sshd)
      Tasks: 37 (limit: 8759)
     Memory: 504.9M (peak: 2.7G swap: 1.4M swap peak: 32.8M)
        CPU: 5d 2h 18min 12.105s
     CGroup: /system.slice/ssh.service
             ├─   1599 "sshd: /usr/sbin/sshd -D [listener] 0 of 10-100 startups"
             ├─  49311 /bin/bash ./iii
             ├─ 297412 "sshd: stosh [priv]"
             ├─ 299016 "sshd: stosh"
             ├─1510512 /bin/bash ./iii
             ├─1510513 /bin/bash ./iii
             ├─1510514 /usr/bin/python3 /home/dca/bin/add.py
             ├─1510515 sed "s/.*/scale=10;&*13.3336+0.5/"
             ├─1510517 bc
             ├─1510518 cut -d. -f1
             ├─2325938 "sshd: markjr [priv]"
             ├─2363513 "sshd: markjr@pts/0"
             ├─2363631 -bash
             ├─2572712 "sshd: bressler [priv]"
             ├─2573893 "sshd: bressler@pts/1"
             ├─2574173 -bash
             ├─2745898 "sshd: wormey [priv]"
             ├─2746976 "sshd: wormey@pts/6"
             ├─2747088 -tcsh
             ├─3472815 "sshd: bbrace [priv]"
             ├─3487252 "sshd: bbrace@pts/3"
             ├─3487499 -bash
             ├─3496206 alpine
             ├─3753117 /usr/libexec/geoclue-2.0/demos/agent
             ├─3929506 "sshd: stosh [priv]"
             ├─3930969 "sshd: stosh"
             ├─3990044 "sshd: witters [priv]"
             ├─3990377 "sshd: witters"
             ├─4162050 "sshd: luagha [priv]"
             ├─4178034 "sshd: luagha@pts/5"
             ├─4178520 -bash
             └─4182386 tf shadow

Jun 16 18:10:20 ubuntu sshd[1341578]: Disconnected from user lhowell 71.169.174.67 port 56228
Jun 16 18:10:20 ubuntu sshd[1339336]: pam_unix(sshd:session): session closed for user lhowell
Jun 16 18:10:23 ubuntu sshd[1351522]: Accepted password for carl from 50.251.249.54 port 51315 ssh2
Jun 16 18:10:23 ubuntu sshd[1351522]: pam_unix(sshd:session): session opened for user carl(uid=5530) by carl(uid=0)
Jun 16 18:10:23 ubuntu sshd[1351522]: pam_systemd(sshd:session): Failed to create session: No such process
Jun 16 18:10:26 ubuntu sshd[1351522]: pam_unix(sshd:session): session closed for user carl
Jun 16 18:10:49 ubuntu sshd[1407341]: Accepted password for carl from 50.54.137.233 port 56619 ssh2
Jun 16 18:10:49 ubuntu sshd[1407341]: pam_unix(sshd:session): session opened for user carl(uid=5530) by carl(uid=0)
Jun 16 18:10:49 ubuntu sshd[1407341]: pam_systemd(sshd:session): Failed to create session: No such process
Jun 16 18:10:51 ubuntu sshd[1407341]: pam_unix(sshd:session): session closed for user carl

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https://bugs.launchpad.net/bugs/2114144

Title:
  Openssh Server ignores Port xxx

Status in openssh package in Ubuntu:
  Incomplete

Bug description:
  I have:
  Port 22
  Port 443

  In my sshd_config, to have it listen to a secondary port 443 to get around firewalls that block ssh.
  Until a few days ago, like port forwarding, this worked, but now, like port forwarding, it is broken.
  The second Port item is just ignored.  It is not acceptable for Canonical to randomly break important functionality like this.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: openssh-server 1:9.6p1-3ubuntu13.11
  Uname: Linux 6.15.0 x86_64
  ApportVersion: 2.28.1-0ubuntu3.7
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: MATE
  Date: Thu Jun 12 00:07:41 2025
  SourcePackage: openssh
  UpgradeStatus: No upgrade log present (probably fresh install)

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References

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