[rt-devel] Attachment insert failed: MySQL server has gone away

[Alex Vandiver]

On Wed, 2012-10-17 at 14:27 -0500, David Hanson wrote:
> My company is fairly new to using RT, about a half a year now, and we
> suddenly seem to be having an attachment issue. We are currently using
> RT 4.0.6 and have been unable to attach images larger than around 1
> MB. We have previously been able to because I had increased the
> maximum attachment size in the RT_SiteConfig, http config, and mysql
> config files. We haven't recently made any updates to the system that
> I am aware of. 

1M is the default max_allowed_packet size for MySQL --  I strongly
suspect that you're hitting that limit, and the failure mode matches
your errors.  Show the contents of your my.cnf file?
 - Alex