DNS client fails on first attempt when DHCP is disabled

Hello,

I am using RL-ARM's TCPnet and am having an issue with the DNS client in TCPnet when I disabled DHCP at run time. What happens is the first domain name that I attempt to resolve into an IP address always fails immediately with get_host_by_name() returning error "DNS_ERROR_UDPSEND". If I attempt to resolve the domain name again, it succeeds, but takes 0.5-2seconds. Any subsequent attempts will succeed in under 100ms.

I see in a comment of Keil's that "DNS_ERROR_UDPSEND" means that there was a UDP Send frame error, and Keil's product manual indicates that "the UDP socket cannot send packets" (http://www.keil.com/support/man/docs/rlarm/rlarm_get_host_by_name.htm)

What is interesting is that if I instead use DHCP (as opposed to a static IP address), the problem disappears and all domain names resolve in under 100ms. Unfortunately, in some instants our product needs to use static IP addresses.

Now, I am turning DHCP off at runtime through the dhcp_disable() function -- as outlined in Keil's product manual (http://www.keil.com/support/man/docs/rlarm/rlarm_tn_runtimecfg.htm)

Here is roughly what my initialization code looks like:

init_TcpNet();

//10ms TCPnet tick task with highest priority --timer_tick()
TCPnetTimerTaskID = os_tsk_create(tick_timer,6);

if (!DHCP)
{
   dhcp_disable();
   memcpy (&localm[NETIF_ETH], &next_ip_config, sizeof(next_ip_config) );
}

FYI: I am running RL-ARM V4.01 and this is on an LPC2468 MCU

Any thoughts on this would be greatly appreciated. Thanks!