}

Articles tagged "ssh"

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ssh linux sysadmin networking security
6 min readIntermediate

SSH Config File (~/.ssh/config) Complete Guide (2026)

Complete guide to the ~/.ssh/config file. Host blocks, IdentityFile, ProxyJump, ServerAliveInterval, multiple GitHub/GitLab accounts, Include directive explained.

ssh linux networking sysadmin firewall
5 min readBeginner

Fix SSH 'Connection Refused' Error — All Causes (2026)

Fix "ssh: connect to host port 22: Connection refused". All causes: SSH not running, wrong port, firewall, fail2ban ban. Diagnostic flow with nc and nmap.

ssh linux security sysadmin networking
6 min readBeginner

Fix SSH 'Host Key Verification Failed' Error (2026)

Fix "WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! Host key verification failed." Safe steps: ssh-keygen -R, known_hosts edit, StrictHostKeyChecking options explained.

ssh security linux sysadmin cryptography
6 min readBeginner

SSH Key Generation and Management in 2026: ed25519, RSA, and More

SSH key generation in 2026: ed25519 vs RSA-4096 vs ECDSA comparison, ssh-keygen commands, ssh-copy-id, authorized_keys, ssh-agent, key rotation guide.

AIX SSH Tunneling Port Forwarding Security
8 min readAdvanced

SSH Tunneling on AIX: Port Forwarding Guide [With Examples]

Learn SSH tunneling and port forwarding on AIX. Local forwarding, remote forwarding, dynamic SOCKS proxy, and practical examples for secure access.

AIX SSH SCP SFTP File Transfer
7 min readBeginner

SCP and SFTP on AIX: Secure File Transfer Guide [Examples]

Complete guide to SCP and SFTP file transfer on AIX. Learn secure copy commands, SFTP usage, batch transfers, and troubleshooting tips.

AIX SSH Security System Administration Unix
9 min readIntermediate

AIX SSH Configuration: Complete Setup Guide [AIX 7.x]

Complete guide to SSH configuration on AIX 7.x. Enable SSH, configure sshd, set up key-based authentication, PAM, troubleshooting, and security hardening.

AIX SSH System Administration Unix
9 min readIntermediate

How to Restart SSH in AIX: startsrc, stopsrc, lssrc Commands

Restart SSH daemon in IBM AIX using startsrc -s sshd, stopsrc -s sshd, and lssrc -s sshd. Covers AIX 6.1, 7.1, 7.2, 7.3. Includes refresh and forced restart with examples.

broken pipe mac os x ssh
1 min readBeginner

OSX MAC Solution to SSH Broken Pipe

In this article, we explain how to avoid the "Broken Pipe" error. You will need to edit you sh config file /etc/ssh/ssh_config or ~/.ssh/config and set the ServerAliveInterval to 120 and TCPKeepAlive to no for all hosts. Check here for the complete information.

ssh tunnel
1 min readBeginner

Reliable reverse ssh tunnel that avoids connection lost

Have you ever use SSH tunnel from work to avoid firewalls? If yes, you probably lost ssh connection which casues to lose the connection to your server or machine. To solve this issue we use autossh with will reconnect on conneciton lost, check this tutorial to use it as a reverse ssh tunnel