SSH client for Windows, macOS and Linux
Connect to a Linux server with an SSH profile, verify its host key and work in the CH-J Tools terminal.
All guides and articles
Practical SSH guides, troubleshooting, comparisons and Server Manager news.
SFTP file manager and remote editor
Transfer and edit remote files over SSH using File Manager with save conflict detection.
HTTP/2, HTTP/3 and TLS diagnostics
Check the actual HTTP protocol with the bundled client and inspect TLS 1.2/1.3.
SHA-512, BLAKE3 and file verification
Calculate local checksums, compare files or verify an expected SHA-512 or BLAKE3 digest.
Linux server monitoring over SSH
Inspect CPU, RAM, swap, filesystems, uptime and network interfaces with the System Monitor plugin.
Verify the GPG signature of a download
Before running an installer, check its OpenPGP signature, key fingerprint and complete SHA-512 checksum.
Install on Ubuntu / Zorin OS through APT
Set up the signed CH-J APT repository on Ubuntu 24.04 amd64 and install CH-J Tools (package ch-j-tools) from the Beta channel.
From Electron to Rust and Tauri: a new foundation for Server Manager
Version 0.1.1 moves to Rust and Tauri 2. Discover the architectural benefits behind the next desktop generation.
Moving to 0.1.2: your data and the release channels
What the Rust and Tauri transition means for existing users, profiles and the encrypted vault.
PuTTY vs. CH-J Tools: which SSH client fits?
Compare terminal access, file transfers and administration workflows, including the strengths and limits of both tools.
Fix SSH connection refused, timeout and permission denied
Identify whether SSH fails at the port, network or authentication stage before changing server configuration.
Ed25519 vs. RSA: choosing and installing SSH keys
Choose a compatible key, protect its private half and test the new login before removing the old access method.
Set up OpenSSH on Windows Server 2022 and 2025
Check the Windows feature, start SSH, restrict network access and verify the host key before connecting.
How to connect through an SSH jump host (bastion)
Reach internal servers through one or more jump hosts, verify every host key and avoid forwarding your agent.
SFTP transfer between two Linux servers without SCP
Copy files between two remote servers through your own computer, handle conflicts and verify the result with SHA-256.
Resource use: Electron 0.1.0, Rust + Tauri 0.1.1 and CH-J Tools 0.1.2 compared
Measured package size, disk space, RAM and CPU on macOS, Windows and Ubuntu for Beta 0.1.0, Alpha 0.1.1 and Beta 0.1.2, including measurement limitations.
How to grow a Linux server disk without losing data
After enlarging a virtual disk, extend the partition, LVM and the ext4 or XFS file system in the right order.
How to create or grow swap on Ubuntu and Debian
Check memory use, create a swap file, make it persistent and resize it safely, with notes on Btrfs and zram.
Managing NGINX without taking the website down
Back up the configuration, test it with nginx -t, apply it with a graceful reload and roll back when something fails.
How to manage several SSH servers at once
Keep several servers organised with SSH aliases and side-by-side terminals, and avoid running a command on the wrong one.
SSH clients for Windows: alternatives to PuTTY and Termius
A neutral overview of Windows OpenSSH, PuTTY, WinSCP, Termius, MobaXterm and CH-J Tools, and how to choose.
SSH host key changed: what the warning means and what to do
Find out why a server presents a new host key, verify it through another channel and replace the stored entry safely.
Server is online but SSH port 22 is not responding
Work through the client, network, firewall and sshd in order to find why the server answers but SSH does not.
Ping fails but SSH and HTTPS work: why, and is it a problem?
Why a server can ignore ping and still run normally, how to test the services directly, and when blocked ICMP causes real faults.
How to edit files in /etc over SFTP and sudo
Why SFTP gets permission denied in /etc, and safe ways to change a configuration file without opening up root access.
A remote file changed while you were editing it: how to avoid overwriting it
How to detect that someone else changed a server file during your edit, compare versions and save without losing either change.
LVM or a standard partition: which should you choose for a server?
What LVM adds over a plain partition, what it costs, and how to decide for a small VPS or a server with several disks.
How to read RAM, cache and swap on a Linux server
What the columns of free mean, why high memory use is often fine, and which signs really point to a memory shortage.
SSH users and root access: a safe setup on Linux
Create an administrator account, install its key, test sudo and only then restrict root login, without locking yourself out.
How to verify that HTTP/3 and QUIC really work
Why an Alt-Svc header is not proof, what to check in NGINX and the firewall, and how to confirm a real QUIC transfer.
SHA-256 vs. SHA-512 vs. BLAKE3: which checksum should you use?
How the three algorithms differ in security, speed and compatibility, what a checksum does not prove, and which to choose.
How to monitor Proxmox VE over SSH
Commands for checking host, guests and storage on Proxmox VE, plus what generic Linux monitoring sees and misses there.