If you try to activate a license, you might get the error code 400 and activation fails. In that case it is normally one of the following things:
- No internet connection.
- Wrong license. If you buy Repetier-Server Upgrade (OEM to Pro), you can only upgrade Repetier-Server OEM. This will not work with Repetier-Serfer Free.
- Spelling error. I and 1 and O and 0 can quickly be mixed up. Copy & past is always safest.
- Name server not set.
- Gateway not set.
- Date/time is not set correctly. That makes https certificates invalid preventing verification.
- A firewall is blocking route to license.internetloesungen.com on port 443.