Increase your tcp queue size on your operating system. Most likely your
OS is dropping older tcp sessions once it hits it's small concurrent tcp
limit.

On solaris for example...

Default is 128, so you can obviously see why you would hit this issue
with moderate traffic.

/usr/sbin/ndd -set /dev/tcp tcp_conn_req_max_q 8192
/usr/sbin/ndd -set /dev/tcp tcp_conn_req_max_q0 8192
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