Email and webmail suddenly blocked? What's behind the IP ban (fail2ban)

Suddenly you can’t get to your emails either with your mail program or through webmail, even though your internet otherwise works normally? Then your IP address has most likely been temporarily blocked. At the top of this page you can see your current public IP address. That’s exactly the information we need to unblock you.

What happened?

Our server protects itself against attacks with a watchdog called fail2ban. If the server registers several failed login attempts in a row from one IP address, it automatically locks that address out for a while. That’s intentional: it reliably stops password-guessing attacks.

For normal customers, the block almost always happens unintentionally, typically because of:

• a wrong password that keeps getting tried over and over;
• the wrong server in the account settings (the mail server is always oberon.jumpit.eu, not your own domain name);
• a device running in the background, often a phone or a second computer, that still has the old password saved and keeps trying unsuccessfully every few minutes.

Because the block applies to your public IP address, all devices on your network are usually affected at the same time, since they share that one address to the outside world.

Find your public IP address

Easiest: at the top of this page your public IP is displayed automatically, including a button to send it to us directly via WhatsApp. If that doesn’t work, here’s how to find it manually:

iPhone / iPad (iOS & iPadOS)

• Open Safari and type what is my IP into the address bar. The first result shows your public IP.
• (Local IP only: Settings → WiFi → tap the ⓘ next to your network → “IP Address”. That’s the internal address and usually not the one that’s blocked.)

Android

• Open Chrome and search for what is my IP.
• (Local IP: Settings → Network & internet → WiFi → your network → advanced details → IP address.)

Mac (macOS)

• Open Safari or Chrome and search for what is my IP (or just use the display above).
• (Local IP: Apple menu → System Settings → Network → active network → Details → TCP/IP.)

Windows

• Open a browser and search for what is my IP (or use the display above).
• (Local IP: open Command Prompt, type ipconfig, and look at the value for “IPv4 Address”.)

Important: What counts for the block is the public IP address (the one your router uses to the outside), not the local address, which usually starts with 192.168.. Some connections also use a long IPv6 address with colons; the display above detects both. If in doubt, just send us the address shown above.

What to do if you’re blocked

1. Fix the password first, or it will block you again right away. As long as a wrong password is still being tried somewhere, another block is only a matter of minutes. Check your email password in webmail and update it on all devices. → Test or change email password. Make sure the server is oberon.jumpit.eu → Set up Outlook · Set up Apple Mail.
2. Wait a moment. Many blocks are time-limited and clear up on their own after a few minutes, provided no new failed attempts come in (see point 1).
3. Let us know. If the block persists, send us your IP address shown above, fastest via the WhatsApp button at the top, and we’ll lift the block manually.

How to avoid the block in the future

• After changing a password, update the new one everywhere at the same time (on your phone too!).
• Always use oberon.jumpit.eu as the server, never your own domain name.
• Remove old devices or mail accounts you no longer use, so they don’t log in with outdated details.