> Sometimes firebird freeze and get this kind of message in the log file. Any ideas why firebird freeze?
>
> Tue Apr 27 17:53:49 2010
> Database: ThreadData::start() failed:
> operating system directive _beginthreadex failed
> Not enough storage is available to process this command.

Seems you have many attachments and Firebird process is out of desktop heap. Desktop heap is very limited resource on Windows, especially for services running without interaction with user desktop.
MSDN have a lot of recomendations of how to avoid this issue.

Regards,
Vlad