diff --git a/src/extpipe.c b/src/extpipe.c
index 8da75cd..6b9b2d4 100644
--- a/src/extpipe.c
+++ b/src/extpipe.c
@@ -107,11 +107,16 @@ static int x_popen(char *command, int uid, int gid, FILE_PIPE *fp, int flags)
       close(piped[j][x_]   );
     }
     if (uid > -1 || gid > -1) {
-      seteuid(0);
-      if (gid > -1) setgid(gid);
-      if (uid > -1) setuid(uid);
-      if (gid > -1) setegid(gid);
-      if (uid > -1) seteuid(uid);
+      if (seteuid(0) != 0)
+        exit(1);
+      if (gid > -1 && setgid(gid) != 0)
+        exit(1);
+      if (uid > -1 && setuid(uid) != 0)
+        exit(1);
+      if (gid > -1 && setegid(gid) != 0)
+        exit(1);
+      if (uid > -1 && seteuid(uid) != 0)
+        exit(1);
     }
     if (flags&1)
       execvp(buf, argv);
diff --git a/src/nwroute.c b/src/nwroute.c
index e4aa108..5eb95c1 100644
--- a/src/nwroute.c
+++ b/src/nwroute.c
@@ -551,7 +551,7 @@ static void send_sip_to_net(uint32 nd_net, int nd_ticks, int mode)
      || ( nw->net == nd_net && nw->hops)     /* server has same net but */
                                              /* hops                    */
      || ( mode == 2 && nw->hops) ) {         /* no SAP to this NET      */
-      XDPRINTF((3, 0, "No SAP mode=%d, to net=0x%lx for server '%s'",
+      XDPRINTF((3, 0, "No SAP mode=%d, to net=0x%x for server '%s'",
              mode, nd_net, nw->name));
       continue;
     }
diff --git a/src/nwserv.c b/src/nwserv.c
index ceb898f..9d0ec65 100644
--- a/src/nwserv.c
+++ b/src/nwserv.c
@@ -729,7 +729,7 @@ static void handle_event(int fd, uint16 socknr, int slot)
     uderr.opt.buf       = (char*)&err_pack_typ; /* get actual typ */
     ud.addr.buf         = (char*)&source_adr;
     t_rcvuderr(fd, &uderr);
-    XDPRINTF((2, 0, "Error from %s, Code = 0x%lx", visable_ipx_adr(&erradr), uderr.error));
+    XDPRINTF((2, 0, "Error from %s, Code = 0x%x", visable_ipx_adr(&erradr), uderr.error));
     if (nw_debug) t_error("t_rcvudata !OK");
     return;
   }
@@ -866,12 +866,12 @@ static void get_ini(int full)
                        upstr(inhalt);
                        if (!strcmp(inhalt, "AUTO")) internal_net = 0;
                        else {
-                         if (sscanf(inhalt, "%ld%c", &internal_net, &dummy) != 1)
-                             sscanf(inhalt, "%lx",   &internal_net);
+                         if (sscanf(inhalt, "%u%c", &internal_net, &dummy) != 1)
+                             sscanf(inhalt, "%x",   &internal_net);
                        }
                        if (anz > 1) {
-                         if (sscanf(inhalt2, "%ld%c", &node, &dummy) != 1)
-                            sscanf(inhalt2, "%lx",   &node);
+                         if (sscanf(inhalt2, "%u%c", &node, &dummy) != 1)
+                            sscanf(inhalt2, "%x",   &node);
                        }
                        if (0 == internal_net) {   /* now we try ip number */
                          char locname[50];
@@ -908,11 +908,11 @@ static void get_ini(int full)
                        nd->frame  = IPX_FRAME_8023;
                        new_str(nd->devname, "eth0");
 
-                       if (sscanf(inhalt, "%ld%c", &nd->net, &dummy) != 1)
-                           sscanf(inhalt, "%lx", &nd->net);
+                       if (sscanf(inhalt, "%u%c", &nd->net, &dummy) != 1)
+                           sscanf(inhalt, "%x", &nd->net);
 
                        if (nd->net && (nd->net == internal_net)) {
-                         errorp(11, "Get_ini", "device net 0x%lx = internal net", nd->net);
+                         errorp(11, "Get_ini", "device net 0x%x = internal net", nd->net);
                          exit(1);
                        }
 
@@ -1012,7 +1012,7 @@ static void get_ini(int full)
       NW_NET_DEVICE *nd=net_devices[k];
       int  result;
       uint8 frname[30];
-      char *sp     = "DEVICE=%s, FRAME=%s, NETWORK=0x%lx";
+      char *sp     = "DEVICE=%s, FRAME=%s, NETWORK=0x%x";
       (void) get_frame_name(frname, nd->frame);
       XDPRINTF((1, 0, sp, nd->devname, frname, nd->net));
 
@@ -1049,7 +1049,7 @@ static void get_ini(int full)
     print_routing_info(1);
 #endif
 
-    XDPRINTF((1, 0, "%s name='%s', INTERNAL NET=0x%lx, NODE=0x%02x:%02x:%02x:%02x:%02x:%02x",
+    XDPRINTF((1, 0, "%s name='%s', INTERNAL NET=0x%x, NODE=0x%02x:%02x:%02x:%02x:%02x:%02x",
         prog_name_typ, my_nwname, internal_net,
         (int)my_server_adr.node[0],
         (int)my_server_adr.node[1],
@@ -1308,8 +1308,8 @@ int main(int argc, char **argv)
 # endif
               if (*a == 'a' && frame > -1) {
                 char dummy;
-                if (sscanf(argv[j+3], "%ld%c", &netnum, &dummy) != 1)
-                    sscanf(argv[j+3], "%lx", &netnum);
+                if (sscanf(argv[j+3], "%u%c", &netnum, &dummy) != 1)
+                    sscanf(argv[j+3], "%x", &netnum);
               }
 #if IN_NWROUTED || INTERNAL_RIP_SAP
               if (netnum > 0)
@@ -1340,7 +1340,8 @@ int main(int argc, char **argv)
       return(usage(argv[0]));
   }
 #if !DO_TESTING
-  chdir("/");
+  if (chdir("/") < 0)
+    perror("chdir");
 #endif
   setgroups(0, NULL);
   init_tools(IN_PROG, init_mode);