Check your SQL username and passwords and make sure they match what is in config/database.yml .
Also see:
[
Lost connection to MySQL server during query - Rails - Ruby-Forum](Lost connection to MySQL server during query - Rails - Ruby-Forum)
[http://wiki.rubyonrails.org/rails/pages/Mysql+Connection+Problems](http://wiki.rubyonrails.org/rails/pages/Mysql+Connection+Problems)
And BTW that tutorial is mega old and not without its problems. The screen casts are more useful.
[http://rubyonrails.org/screencasts](http://rubyonrails.org/screencasts)
Good luck. Don’t drink the wine, and dodge the rapiers if you can.
- foobario