![]() For more information, see Configure role assignments for the VM that uses Microsoft Entra login. Otherwise, the "Permission denied (publickey)" error will be received. If you are using Microsoft Entra ID to manage SSH logins, the user must be assigned the Virtual Machine Administrator Login or Virtual Machine User Login role on the resource group that contains the VM and its associated resources.You cannot use port redirection / mapping without using an Azure load balancer.Ensure that a Network Security Group rule exists to permit SSH traffic (by default, TCP port 22).Verify the network security group rules permit SSH traffic and role assignment.Quick troubleshooting stepsĪfter each troubleshooting step, try reconnecting to the VM. Please use the Feedback button on this page to let us know how well this article worked for you or how we can improve it. bash's TMOUT) or something like a PAM module.Was this article helpful? Your input is important to us. If you need a idle timeout, then I suggest looking at shell features Or kept a forwarded TCP connection open then it would never fire. ![]() if the client specified it's own ServerAliveTimeout If it did that then it was by accident and would be Some particularly relevant excerpts:ĬlientAliveCountMax=0 has never been specified to work as an idle Some have submitted bug reports against openssh, in particular this one and this one. The relevant change to the sshd_config man pages for ClientAliveCountMax is this additional sentence: " Setting a zero ClientAliveCountMax disables connection termination." While one can find a great many references saying to set ClientAliveCountMax 0 in conjunction with ClientAliveInterval N to create an inactivity/idle timeout, evidently that was not an intended ability and has now been intentionally closed. ClientAliveInterval 10, ClientAliveCountMax 0: ssh -v records the message debug1: client_input_channel_req: channel 0 rtype reply 1 every 10 secondsĪs of the more recent versions of openssh server, there is no way to configure an inactivity/idle timeout via /etc/ssh/sshd_config.ClientAliveInterval 10, ClientAliveCountMax 0: session disconnects after 10 seconds.ClientAliveInterval 10, ClientAliveCountMax 3: ssh -v records the message debug1: client_input_channel_req: channel 0 rtype reply 1 every 10 seconds.I've connected from the same host, the only difference is I used pubkey authentication for the server in question and password authentication for the Debian 10 server. Options that differ: casignaturealgorithms, gssapikexalgorithms, hostbasedacceptedkeytypes, hostkeyalgorithms, kexalgorithms, passwordauthentication, permitrootlogin, pubkeyacceptedkeytypes, pubkeyauthoptions, securitykeyprovider *For Debian 10 I wanted to compare sshd -T. Ii openssh-server 1:8.2p1-4ubuntu0.1 amd64 secure shell (SSH) server, for secure access from remote sshd -V ||/ Name Version Architektur Beschreibung |/ Fehler?=(kein)/R=Neuinstallation notwendig (Status, Fehler: GROSS=schlecht) Halb installiert/Trigger erWartet/Trigger anhängig | Status=Nicht/Installiert/Config/U=Entpackt/halb konFiguriert/ Gewünscht=Unbekannt/Installieren/R=Entfernen/P=Vollständig Löschen/Halten I also started a new session after I restarted sshd to avoid having old settings in my ssh-session.ĮDIT2: Added keyword "incoming" to the description above to make it clearer, that I want my ssh server (sshd) to drop connections after an idle timeout, because users might forget about their open (and unsed) ssh sessions.ĮDIT3: Just for information - used sshd version: dpkg -l openssh-server sshd -T | grep -i "ClientAlive"Ĭould the client still be sending KeepAlive-Packages? I cannot control all versions of clients that connect.ĮDIT: TCPKeepAlive yes doesn't change the behaviour, sessions still linger. On top of that I think TCPKeepAlive could be left at its default which should be yes. I would expect sshd not to send KeepAlive-Packages due to TCPKeepAlive and ClientAliveCountMax - and my sessions to timeout after 30 seconds. I've set the following settings TCPKeepAlive no I want incoming ssh-sessions to automatically disconnect upon inactivity for a security-critical server.
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