Lost connection to MySQL server during query

Thank you for any help you might provide. This is keeping me awake

Mysql::Error in #
Lost connection to MySQL server during query
Application Trace
c:/ruby/lib/ruby/site_ruby/1.8/mysql.rb:1116:in write

This error has come up intermittently but often for many months… It
is keeping us from rolling out a RoR system. I’ve devoted a day a week
for the past two months to try to fix it without any success. I’ve
fiddled with:
MySQL parameters – no effect from
High values for all timeouts
environment.rb – no effect from
{@connection.reconnect = true}
database.yml – no effect from
timeout: 8000
reconnect: true

The problem doesn’t happen with batch programs – only with Rails.

It happens with about one transaction in twenty.

The problem doesn’t seem to correlate with database load, or idle time,
or anything else.

Any ideas or suggestions? Any suggestions on how to collect good data
on what’s causing this?

Windows 2000 Server SP4
Apache 2.2
MySQL 5.1.32
Ruby 1.8.6
ActiveRecord 2.3.4
mysql 2.8.1

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