COD2 on Debain 20 minute delay

[Jafo]

Hello,

I just setup a Linux dedicate server on Debian Etch. When I fire up the
server it has to run for about 20 minutes before clients can connect.
Doing a packet trace I see the client sending UDP requests about every
second or so. All of a sudden after the server's been running for approx.
20 minutes the clients can connect. After that there's no connection
issues.

When I run strace on the server PID I get the following:

recvfrom(32, 0x85e6880, 131072, 0, 0xafd32510, 0xafd3250c) = -1 EAGAIN
(Resource temporarily unavailable)
gettimeofday({1161182635, 802267}, {240, 0}) = 0
time([1161182635])                      = 1161182635
gettimeofday({1161182635, 802474}, NULL) = 0
nanosleep({0, 5000000}, NULL)           = 0
select(1, [0], NULL, NULL, {0, 0})      = 0 (Timeout)
recvfrom(32, 0x85e6880, 131072, 0, 0xafd32510, 0xafd3250c) = -1 EAGAIN
(Resource temporarily unavailable)

Can anyone help with this problem?

TIA