TM4C129ENCZAD: TI NDK only allowing 6 connections to my device

Hi,

I am seeing a weird issue where the TI NDK running on my TIVA processor is only allowing 6 TCP connections to my device.  Once 6 TCP connections are established to the device other connections WILL NOT be established, and NDK_accept() always returns EWOULDBLOCK when called.

I can't post my code but I will summarize it here:

1. The code uses DHCP to get assigned IP address, etc.
2. The code has a separate thread running to handle TCP connections
3. During initialization, the task calls fdOpenSession()
4. During initialization, the task calls NDK_socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
5. During initialization, the task calls NDK_setsockopt to:
   1. Set SO_BLOCKING to 0 (non-blocking socket)
   2. Set SO_KEEPALIVE to 60
   3. Set SO_RCVTIMEO to 30000 microseconds
   4. Set SO_SNDTIMEO to 1 second
   5. Set SO_LINGER with linger_opt.l_linger = 1 and linger_opt.l_onoff = 0
6. During initialization, the task calls NDK_bind() with AF_INET, IP address from DHCP and port number 9970
7. During initialization, the task finally calls NDK_listen() with maxcon set to 8 (we will only handle 8 connections)
8. In a loop, the task calls NDK_accept() to look for new connections

There is error checking done through the entire initialization process and for the first 6 connections everything works fine, and NDK_accept() returns valid socket handles.  But after 6 connections have been established, NDK_accept() always returns EWOULDBLOCK error.  Has anyone seen anything like this or does anyone have any suggestions as to how to allow all 8 connections? 

Thanks!