diff --git a/libnetutil/netutil.cc b/libnetutil/netutil.cc
index 28c624c..1107cb3 100644
--- a/libnetutil/netutil.cc
+++ b/libnetutil/netutil.cc
@@ -1298,6 +1298,9 @@ static int canonicalize_address(const struct sockaddr_storage *ss,
   hints.ai_flags |= AI_NUMERICHOST;

   rc = getaddrinfo(canonical_ip_string, NULL, &hints, &ai);
+  if (rc != 0) {
+      fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rc));
+  }
   if (rc != 0 || ai == NULL)
     return -1;
   assert(ai->ai_addrlen > 0 && ai->ai_addrlen <= (int) sizeof(*output));
@@ -1330,6 +1333,8 @@ static int collect_dnet_interfaces(const struct intf_entry *entry, void *arg) {
       if (addr_ntos(&entry->intf_addr, (struct sockaddr *) &tmpss) == -1) {
         dcrn->ifaces[dcrn->numifaces].addr.ss_family = 0;
       } else {
+        fprintf(stderr,"Canonicalizing %s, type %d\n", entry->intf_name, entry->intf_type);
+        fprintf(stderr," ai_family = %d, address %s\n", tmpss.ss_family, addr_ntoa(&entry->intf_addr));
         rc = canonicalize_address(&tmpss, &dcrn->ifaces[dcrn->numifaces].addr);
         assert(rc == 0);
       }