2003 server built in dos prevention??

The situation is this, i have a telnet chat server that can have 100+ active
connections during peak times. It is occasionally necessary to take this
down for various reasons. When restarting the server the clients are
automatically trying to reconnect before the port is opened by the server
for up to a minute or so as the server goes through some initialization
stuff.... in w2k pro the os was crippled so if there were 5 connect attempts
outstanding after the port was opened the port would be disabled... the
server os doesn't do this, but it still on occasion seems to lock out the
port. is there some other, maybe anti-dos, protection that could be
triggered by a large number of port connection attempts in a short period??
if so, can it be disabled or made less sensitive??


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