[mythtv-users] Remote frontends can't connect following Mythbuntu update

[scram69]

Ran the update manager on my Mythbuntu 12.04 backend (I know, bad
idea) last week, and discovered that remote frontends could no longer
connect.

Here's the frontend log message:

2012-05-20 19:48:53.809600 E  Unable to connect to database!
2012-05-20 19:48:53.809640 E  Driver error was [1/2003]:
QMYSQL: Unable to connect
Database error was:
Can't connect to MySQL server on '192.168.1.50' (61)

My backend has the static IP address above: I hadn't changed that or
anything in the frontends' settings.

I checked /etc/mythtv/mysql.txt and config.xml - nothing had changed.
In desperation, I changed the mysql password for the mythtv user from
the Mythbuntu random gibberish to "mythtv".  While that wreaked havoc
with mythweb, it still did not fix the problem.

What I finally discovered was that the update had edited an obscure
file called /etc/mysql/conf.d/mythtv.cnf.  Inexplicably, it was
changed from

[mysqld]
bind-address=0.0.0.0

to

[mysqld]
#bind-address=0.0.0.0

The net effect was that the mysql server no longer listened for
frontends on the network, only for the local frontend.  Removing the
"#" character solved the problem.

I figured I'd post here in case anyone else had been screwed over by
the update manger recently.  Any idea why the Mythbuntu update would
mess around with mysql that way?