> Hello,
>
> we had the same problem on several OS (Windows XP, Windows 2003=20
> Server). My colleague who dealt with this problem wrote me:
>
> Function select() does not accept more than 64 socket handles. In=20
> win32.hlp for function select() is written this:
> (The default value of FD_SETSIZE is 64, which can be modified by=20
> #defining FD_SETSIZE to another value before #including WINSOCK2.H.)

Firebird defined FD_SETSIZE as 1024 but included winsock.h, not
winsock2.h

Regards,
Vlad