[lwip-users] Failed initial TCP handshake

[jurgen]

Hello,

I am using the LWIP stack with great success. However sometimes the
initial TCP handshake of an active connect from LWIP to a Windows 2000
client fails.
See Ethereal log:

    No. Time        Source                Destination           Protocol Info
   1092 185.630678  LWIP                  W2K                   TCP     
4129 > nm-assessor [SYN] Seq=39837 Ack=0 Win=2048 Len=0
   1093 185.631072  W2K                   LWIP                  TCP     
nm-assessor > 4129 [SYN, ACK] Seq=3474309920 Ack=39838 Win=64240 Len=0
   1098 188.400659  LWIP                  W2K                   TCP     
4129 > nm-assessor [SYN] Seq=39837 Ack=0 Win=2048 Len=0
   1099 188.401038  W2K                   LWIP                  TCP     
nm-assessor > 4129 [ACK] Seq=3474309921 Ack=39838 Win=64240 Len=0
   1101 188.440646  LWIP                  W2K                   TCP     
4129 > nm-assessor [PSH, ACK] Seq=39838 Ack=3474309922 Win=2048 Len=160
   1102 188.441180  W2K                   LWIP                  TCP     
nm-assessor > 4129 [RST] Seq=3474309922 Ack=3474309922 Win=0 Len=0
   1103 188.838805  W2K                   LWIP                  TCP     
nm-assessor > 4129 [SYN, ACK] Seq=3474309920 Ack=39838 Win=64240 Len=0
   1105 188.860639  LWIP                  W2K                   TCP     
4129 > nm-assessor [RST, ACK] Seq=39838 Ack=3474309921 Win=2048 Len=0

Anyone noticed this before ?
Anyone hints/tips on how to fix it, because the handshake fails but the
accept callback gets triggerd !

Jurgen