WordPress sites don't work after 1 little change in Lighttpd

I have 3 domain names running on my VPS.
All 4 of the WordPress sites don't work anymore, after changing only 1 thing in Lighttpd.conf.
At the very end, I've added this one:

Code:

## number of child worker processes to spawn (0 for lightly loaded sites)
server.max-worker      = "2"

Results: Every single site shows this:

Code:

Error establishing a database connection

I tried to remove that, but no success.
I've restarted MySQLd and Lighttpd a billion times, and a full system reboot.
Also, no success.

Edit:
Sorry to not mention the specs:
CentOS 5.5-final x86_64.
Lighttpd.
PHP5.
MySQL 5.x.
ProFTPd.
128 MB RAM.
256 MB Swap.

 

Any errors in the lighttpd logs?

 

I'm currently working on a Debian-based VPS.
I'll fall back on this thread, when it's needed again.