maximum connections for mpd

[Nyoman Bogi Aditya Karna]

our VPN server is using mpd3.18 + freebsd6.1
and currently we provide 250 VPN connections
for our students and it works well.

but when i try to make 500 connections
the mpd failed to run.

i suspect it was the freebsd
that can not provide ng more than 250.

is there anything i should do ?
maybe tuning the freebsd ?

thanks in advance 

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STT Telkom, http://www.stttelkom.ac.id