CH-J Toolsserver management over SSH
Practical SSH guides, troubleshooting, comparisons and Server Manager news.
CH-J Tools can add the post-quantum key type ssh-mldsa44-ed25519 to a server only when that server runs OpenSSH 10.6 or newer. OpenSSH 10.6 (6 October 2026) is the first release with the standardized form of this key type. Older…
Connect to a Linux server with an SSH profile, verify its host key and work in the CH-J Tools terminal.
Transfer and edit remote files over SSH using File Manager with save conflict detection.
Check the actual HTTP protocol with the bundled client and inspect TLS 1.2/1.3.
Calculate local checksums, compare files or verify an expected SHA-512 or BLAKE3 digest.
Inspect CPU, RAM, swap, filesystems, uptime and network interfaces with the System Monitor plugin.
Before running an installer, check its OpenPGP signature, key fingerprint and complete SHA-512 checksum.
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.
Version 0.1.1 moves to Rust and Tauri 2. Discover the architectural benefits behind the next desktop generation.
What the Rust and Tauri transition means for existing users, profiles and the encrypted vault.
Compare terminal access, file transfers and administration workflows, including the strengths and limits of both tools.
Identify whether SSH fails at the port, network or authentication stage before changing server configuration.
Choose a compatible key, protect its private half and test the new login before removing the old access method.
Check the Windows feature, start SSH, restrict network access and verify the host key before connecting.
Reach internal servers through one or more jump hosts, verify every host key and avoid forwarding your agent.
Copy files between two remote servers through your own computer, handle conflicts and verify the result with SHA-256.
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.
After enlarging a virtual disk, extend the partition, LVM and the ext4 or XFS file system in the right order.
Check memory use, create a swap file, make it persistent and resize it safely, with notes on Btrfs and zram.
Back up the configuration, test it with nginx -t, apply it with a graceful reload and roll back when something fails.
Keep several servers organised with SSH aliases and side-by-side terminals, and avoid running a command on the wrong one.
A neutral overview of Windows OpenSSH, PuTTY, WinSCP, Termius, MobaXterm and CH-J Tools, and how to choose.
Find out why a server presents a new host key, verify it through another channel and replace the stored entry safely.
Work through the client, network, firewall and sshd in order to find why the server answers but SSH does not.
Why a server can ignore ping and still run normally, how to test the services directly, and when blocked ICMP causes real faults.
Why SFTP gets permission denied in /etc, and safe ways to change a configuration file without opening up root access.
How to detect that someone else changed a server file during your edit, compare versions and save without losing either change.
What LVM adds over a plain partition, what it costs, and how to decide for a small VPS or a server with several disks.
What the columns of free mean, why high memory use is often fine, and which signs really point to a memory shortage.
Create an administrator account, install its key, test sudo and only then restrict root login, without locking yourself out.
Why an Alt-Svc header is not proof, what to check in NGINX and the firewall, and how to confirm a real QUIC transfer.
How the three algorithms differ in security, speed and compatibility, what a checksum does not prove, and which to choose.
Commands for checking host, guests and storage on Proxmox VE, plus what generic Linux monitoring sees and misses there.
CH-J Keys2 (keys2.ch-j.de). A public keyserver on CH-J's own infrastructure. Publish and find public OpenPGP V4 and V6 certificates with support for all seven post-quantum algorithms in RFC 9980 and VKS/HKP interfaces. Private keys stay with you.