Minecraft – “Invalid Session (Try restarting your game)” Minecraft online-server error

Just as the error says your session ID, what you log in with, is invalid. This usually happens when you log in to your account and then have a new instance of minecraft and log in again without closing down the old one. The old session ID is invalidated as soon as the new connection is made. This will give you the error above when you attempt to log into a server as it will only have the new Session ID.

Restarting your client is the only way to get a new session ID as it will wipe out whatever it thinks the new one is and truly give you a new one. (Restart your client by quitting the game, closing and reopening the launcher, and then starting the game again)

If this problem persists, and you have already tried the possible causes (e.g. firewall, VPN), then try contacting Mojang customer support.

My son has qustodio and was having this same issue with Minecraft. I e-mailed qustodio customer service and was given a very quick response with a procedure that solved the problem! My son is now back to using Minecraft. I hope it works for you, here is the text from the e-mail:

Hi, We have resolved the issue and reinstalling should address it. So, can you please try again to install on your computer by following these exact steps?

• Uninstall any security suite from your computer
• Restart your computer
• Log into the computer with an admin account
• Make sure you are connected to the internet
• Download a fresh version of Qustodio from here: http://www.qustodio.com/family/download
• Follow the installation steps provided.

Then, please make sure to install the very last updates of Windows and of your web browser and restart your computer. If everything works fine then, you should be able to reinstall the antivirus safely.