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[Bug 2109831] Re: PerSourceMaxStartups setting now preventing all ssh access

To: debcrafters-packages@xxxxxxxxxxxxxxxxxxx
From: Gordon Lack <2109831@xxxxxxxxxxxxxxxxxx>
Date: Tue, 28 Oct 2025 22:36:42 -0000
Reply-to: Bug 2109831 <2109831@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Still failing in Questing.

On the 4th attempt with "PerSourceMaxStartups 3" set I see:

Oct 28 22:31:13 ganuc sshd[4076]: drop connection #0 from
[192.168.1.101]:52956 on [192.168.1.105]:22 Maxstartups

(so the "past" is no longer there, but the effect is).

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https://bugs.launchpad.net/bugs/2109831

Title:
  PerSourceMaxStartups setting now preventing all ssh access

Status in openssh package in Ubuntu:
  Confirmed

Bug description:
  I used to have "PerSourceMaxStartups 3" as a setting in a config file
  in /etc/ssh/sshd_config.d

  However, after the upgrade to Plucky this eventually prevents ALL ssh
  access to the system.

  It seems to allow 3 connexions, then denies all access until the ssh
  server is restarted.

  It was fine in Oracular.

  ProblemType: Bug
  DistroRelease: Ubuntu 25.04
  Package: openssh-server 1:9.9p1-3ubuntu3.1
  ProcVersionSignature: Ubuntu 6.14.0-15.15-generic 6.14.0
  Uname: Linux 6.14.0-15-generic x86_64
  ApportVersion: 2.32.0-0ubuntu5
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: KDE
  Date: Fri May  2 11:36:02 2025
  InstallationDate: Installed on 2024-10-12 (202 days ago)
  InstallationMedia: Kubuntu 24.10 "Oracular Oriole" - Release amd64 (20241007.6)
  SourcePackage: openssh
  UpgradeStatus: Upgraded to plucky on 2025-04-26 (5 days ago)

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