diff --git a/src/sys/net/api/tcpip.c b/src/sys/net/api/tcpip.c
index ac601b6..56d0c76 100644
--- a/src/sys/net/api/tcpip.c
+++ b/src/sys/net/api/tcpip.c
@@ -215,16 +215,16 @@
  */
 err_t tcpip_input(struct pbuf *p, struct netif *inp) {
 #if LWIP_ETHERNET
-  kprintf("tcpip_input0\n");
+  //kprintf("tcpip_input0\n");
   if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
-    kprintf("tcpip_input1\n");
+    //kprintf("tcpip_input1\n");
     return tcpip_inpkt(p, inp, ethernet_input);
   }
   else
 #endif /* LWIP_ETHERNET */
-    kprintf("tcpip_input2\n");
+    //kprintf("tcpip_input2\n");
   return tcpip_inpkt(p, inp, ip_input);
-  kprintf("tcpip_input3\n");
+  //kprintf("tcpip_input3\n");
 }
 
 /**
diff --git a/src/sys/net/net/sys_arch.c b/src/sys/net/net/sys_arch.c
index 74c878e..42a629a 100644
--- a/src/sys/net/net/sys_arch.c
+++ b/src/sys/net/net/sys_arch.c
@@ -148,8 +148,7 @@
 
 err_t sys_mbox_new(struct sys_mbox **mb, int size) {
   struct sys_mbox *mbox = 0x0;
-  LWIP_ASSERT("mbox null", mbox);
-  //MrOlsen (2017-12-28) - lock is not a pointer
+  LWIP_UNUSED_ARG(size);
 
   mbox = (struct sys_mbox *)kmalloc(sizeof(struct sys_mbox));
 
@@ -177,6 +176,7 @@
   //  return ERR_MEM;
   //}
 
+  *mb = mbox;
   return (ERR_OK);
 }
 
@@ -345,8 +345,7 @@
 
 
 int sys_mbox_valid(sys_mbox_t *mbox) {
-  return(0x0);
-  //return mbox->queue != NULL;
+  return mbox != NULL;
 }
 
 void sys_mbox_set_invalid(sys_mbox_t *mbox) {
diff --git a/src/sys/net/netif/ethernetif.c b/src/sys/net/netif/ethernetif.c
index b9264d0..dde9c87 100644
--- a/src/sys/net/netif/ethernetif.c
+++ b/src/sys/net/netif/ethernetif.c
@@ -275,23 +275,23 @@
   ethernetif = netif->state;
 
   /* move received packet into a new pbuf */
-kprintf("ethernetif_input0\n");
+//kprintf("ethernetif_input0\n");
   p = low_level_input(netif);
-kprintf("ethernetif_input1\n");
+//kprintf("ethernetif_input1\n");
   /* if no packet could be read, silently ignore this */
   if (p != NULL) {
-kprintf("ethernetif_input2\n");
-kprintf("netif->input: [0x%X][0x%X]\n", netif->input, tcpip_input);
+//kprintf("ethernetif_input2\n");
+//kprintf("netif->input: [0x%X][0x%X]\n", netif->input, tcpip_input);
     /* pass all packets to ethernet_input, which decides what packets it supports */
     if (netif->input(p, netif) != ERR_OK) {
-kprintf("ethernetif_input3\n");
+//kprintf("ethernetif_input3\n");
       LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
       pbuf_free(p);
-kprintf("ethernetif_input4\n");
+//kprintf("ethernetif_input4\n");
       p = NULL;
     }
   }
-kprintf("ethernetif_input5\n");
+//kprintf("ethernetif_input5\n");
 }
 
 /**