Hello Fabio,

> I'd to drop the UDF? Or I'd to replace them with something else? But what?
> In which way the UDF functions can compromise the work of firebird server?
>

I meant the self-written UDF with memory leaks or access violation problems.
In your case it's standard UDF, it's unlikely to be the crash reason.

>
> I will try to trace the error, but I can't use Dr. Watson feature on
> Windows Server 2008; I've to use Windows Error Reporting (WER), how is
> specified at:
> http://msdn.microsoft.com/en-us/library/bb787181%28VS.85%29.aspx
>

Good.
Another suggestion is to check RAM on your system
http://www.ib-aid.com/articles/item93

Regards,
Alexey Kovyazin
IBSurgeon (www.ib-aid.com)


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