I always install a free version of Db2 on my laptop so I can play a bit in a really safe environment without breaking the real ones.

Db2 Express-c has been replaced by the Db2 Community Edition

So a few days ago I tried to start my Db2 instance for testing and I got the following error.

SQL1397N The Db2 service failed to logon.

And to be honest it took me a while to realize the problem was the Db2 service.

So we go to Windows Services -> Right Click on the Db2 service -> Properties -> Log On.

Once the password has been updated. We can start Db2.