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TCPNET: SYN retry timeout not controlable

Hi All,

I'm having trouble with controlling the SYN re-transmit timeout.
My platform (NXP-LPC1837) connects to an application on windows, every once in a while the windows IP-stak doesn't respond to the SYN.
The TCPNET stack re-transmits the SYN packet.
The only problem I have with this is that the timeout between the SYN re-transmission is uncontrollable.

e.g.:
First SYN at 0 secs
Second SYN is at 58.6 seconds
Third SYN is at 165.48 seconds
SYN ACK at 165.48 seconds

I checked the tick function settings and timer tick, these are correct.
I checked the SYN timeout:
#define TCP_SYN_RETRY_TOUT 2 /* TCP SYN frame retransmit period in sec. */

Any suggestions would be greatly appreciated.

Thanks,
Dennis