OpenSSH – Page 11 – WindowsTechs.com

Interpreting SSH information on Windows Event Viewer…. sshd: Did not receive identification string from ipaddress on port portnumber

Posted on January 26, 2020 by C.Mann

I am currently reading through Windows Event Log (OpenSSH) looking at the artefacts created by an attack, I am trying to understand the meaning of certain notifications.

A brute force attack was made by myself, from a Kali Linux machine … Continue reading Interpreting SSH information on Windows Event Viewer…. sshd: Did not receive identification string from ipaddress on port portnumber→

Does it weaken the encryption of SSH to use compression?

Posted on January 24, 2020 by TopherIsSwell

When using compression on openssh (a la ssh -C …), does this reduce entropy and make the tunnel traffic more vulnerable to cryptanalysis? Is compression an option I should disable server-side for this or any other reason?

I have a vagu… Continue reading Does it weaken the encryption of SSH to use compression?→

How can I SSH into my server when SSH is blocked on the public network I’m connected to? [closed]

Posted on January 22, 2020 by CanadaIT

What’s a quick and simple way to connect to my server over SSH when the SSH is blocked on the network I’m connected to?

I’m running MacOS on the client side and Ubuntu 18.04 on the server side. My first thought was to just throw the SSH … Continue reading How can I SSH into my server when SSH is blocked on the public network I’m connected to? [closed]→

How do I fix ‘Bad protocol version identification’ errors? [migrated]

Posted on January 3, 2020 by Kewbish

I’m a beginner at using SSH, and I’m trying to connect to a VM from a tablet using an app. The app says that it connects successfully, but soon, it loses the connection to the server.
I have installed OpenSSH, and when I chec… Continue reading How do I fix ‘Bad protocol version identification’ errors? [migrated]→

SSH and the ECDH component

Posted on January 3, 2020 by Woodstock

With SSH, most of my servers use ed25519 (the twisted Edwards variant EC) for authentication.

I was wondering, after authentication with ed25519, does SSH protocol 2 simple use ephemeral/ephemeral ECDH over curve25519 for th… Continue reading SSH and the ECDH component→

How to accept only user identity keys of type ed25519 on OpenSSH Linux server?

Posted on November 28, 2019 by MountainX

I want to force all users to use only ed25519 type keys when logging in via SSH / SFTP to a Linux server which is running a recent version* of OpenSSH.

Some general reasons for putting controls on SSH keys might include:

… Continue reading How to accept only user identity keys of type ed25519 on OpenSSH Linux server?→

Does `ssh-keyscan` verify the legitimacy of the host(s) it scans?

Posted on November 21, 2019 by Kal

There are tutorials on the web, such as this one: https://blog.oddbit.com/post/2019-02-24-docker-build-learns-about-secr/

They show you sample code to run ssh-keyscan in an automated manner so that subsequent automation steps that depend … Continue reading Does `ssh-keyscan` verify the legitimacy of the host(s) it scans?→

changing defaults when generating new SSH server keys

Posted on October 24, 2019 by Martin Vegter

On Debian, I can generate new SSH server keys:

rm /etc/ssh/ssh_host_*
dpkg-reconfigure openssh-server

but that will generate the keys with default values, ie 2048 RSA key.

What is happening under the hood, when I execute dpkg-reconfigu… Continue reading changing defaults when generating new SSH server keys→

Install openssh-server 8.0p1 on Ubuntu 18.04.3 LTS [migrated]

Posted on October 1, 2019 by Tirithen

Ubuntu 18.04.3 LTS (bionic) have OpenSSH server version 7.6p1 but that release is 2 years old by now. On my local Arch Linux machine I’m running 8.0p1 but Ubuntu naturally have slower pace.

The network analysis tool we use s… Continue reading Install openssh-server 8.0p1 on Ubuntu 18.04.3 LTS [migrated]→

SSH (ssh_auth_list) authentication failing from windows to linux

Posted on September 22, 2019 by Mohit Chauhan

Bit new in ssh and have an issue in understanding. I got a code which uses ssh_auth_list routine as below.

method = ssh_auth_list(session);
printf(” %d ” , method);

I am using a ssh library and when I am calling this routi… Continue reading SSH (ssh_auth_list) authentication failing from windows to linux→