The problem

Your company's firewall blocks port 22. You can't SSH to your home server, your lab, your Raspberry Pi. The only open port is 443. But 443 on your server is already used for web traffic. You could spin up a small dedicated VPS just for a jump host — but it will cost you $5/month and is mostly idle.

jump443 is a tiny SSH jump host that listens on port 443 — the HTTPS port that every corporate firewall allows through. One flag. One connection. End-to-end encrypted.

How it works

ssh -J jump443@ssh.jump443.net:443 user@your-server.com

Your SSH client opens a tunnel through jump443 to your destination. The cryptographic handshake happens directly between your machine and your server — jump443 is a blind relay forwarding packets it cannot read or tamper with.

Under the hood, this is a standard SSH ProxyJump (-J) through an sshd instance that enforces strict per-user destination whitelists via permitopen.

Security

• No shell access. ForceCommand intercepts every session. There is no path to a bash prompt on the jump server.
• No man-in-the-middle. The SSH handshake is end-to-end between your client and your destination. Any impersonation triggers an immediate host key warning.
• Whitelisted destinations only. Each user configures up to 2 allowed hosts. sshd enforces this at the protocol level — no application-layer tricks.
• Key-only authentication to jump443. No passwords accepted at the jump host. Your authentication to the destination server is entirely your own business — use whatever method it supports.
• All connections logged. Timestamp, source IP, and user identity are recorded. We cooperate with law enforcement and destination server owners on request.

Pricing

New accounts get 75 free trial connections — enough to verify everything works before paying. When the trial runs out, tunneling stops but account management commands still work so you can check status and upgrade.

Legality

• This is not an anonymizer. We log every connection and will share those logs if problems arise. See the privacy policy.
• This service provides no special capability. Anyone can set up an equivalent jump host on a $5 VPS in ten minutes. jump443 is a convenience, not a loophole.

Abuse

jump443 is a bridge between you and your own servers. Any behaviour targeting third-party systems will result in immediate account termination:

• Brute-force attacks — scanning or password-guessing against any host
• Mass automated signup — creating accounts in bulk to abuse the free trial
• Complaints from destination server owners — if the owner of a server you're connecting to reports abuse, we act on it

To report abuse: abuse@jump443.net