How to fix "no matching host key type found"
An SSH connection may fail with no matching host key type found when a newer client disables ssh-rsa and ssh-dss. These options configure compatibility.
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SSH/Telnet.
16 articles on this topic
Fixing SSH "no hostkey alg" on Debian/Ubuntu
If SSH to a Debian/Ubuntu server returns no hostkey alg, the SSH client failed the host key algorithm check while connecting. To fix it, check permissions…
How to fix an ssh connection refused with "no hostkey alg"
If connecting to a server over SSH fails with "no hostkey alg", as in the example below: debug1: Reading configuration data /etc/ssh_config debug1: Connecting to 192.168.1.1 [192.168.1.1] port 22.
Enable SFTP logging transfer
SFTP, installed with OpenSSH, does not normally log activity. To log access and file changes, configure its Subsystem settings.
How to remote access Linux GUI in Windows with Xming
Many people assume that connecting to Linux over SSH with PuTTY cannot run GUI applications such as firefox or system-config-network. With the right settings…
Configure SSH Keys authentication with PuTTY
PuTTY is a popular program for remotely accessing Linux. SSH key authentication makes logging in more convenient for system administrators.
How to limit SCP bandwidth
scp copies files between machines and can saturate links between sites. Use -l to limit bandwidth in Kbit/s.
Enable Telnet in Linux Server
Linux does not enable Telnet because it is insecure, using SSH instead. To install and enable Telnet, install the telnet-server package.
Lock user after a set number of login attempts but also automatically unlock after 5 minutes
This article explains how to lock a user after a set number of login attempts using the pam_tally module in PAM.
Test the connectivity to server using netcat
Use netcat to test a connection by opening a socket on the server and connecting from a client on the network.
Use IPv6 address be specified with scp, sftp and ssh
Use scp, sftp, and ssh with IPv6 addresses by enclosing the address in square brackets, as demonstrated with fe80::219:99ff:fe20:c251.
Show line numbers in vi/vim editor.
Sometimes you need to find a specific line in a file, such as one identified by an error log. vi/vim can easily display or hide line numbers.
Configure the shell to logout automatically after a period of idle time.
On systems with many users, users who leave without logging out waste system resources. This method addresses that and also improves security…
Setup SSH to disable direct root login.
To prevent direct root login over SSH, edit #vi /etc/ssh/sshd_config and set PermitRootLogin to no: PermitRootLogin no. Then restart SSH.
Logout the user from ssh after 15 minutes of inactivity
For SSH security, configure the system to log out users after 15 minutes of inactivity by editing sshd_config.
Telnet as the root user
Telnet is usually disabled on Linux for security reasons. This article describes enabling direct root login through telnet.