diff --git a/build.go b/build.go
index c1d0dcd..1983fa6 100644
--- a/build.go
+++ b/build.go
@@ -1,3 +1,3 @@
 package main
 
-var build = "339"
+var build = "342"
diff --git a/gbld.go b/gbld.go
index 2fa2315..6762743 100644
--- a/gbld.go
+++ b/gbld.go
@@ -18,10 +18,9 @@ import (
 	"github.com/AlecAivazis/survey/v2"
 )
 
-var version = "1.19.2"
+var version = "1.19.3"
 
-var VERSIONURL = "http://gozilla.fhi.mpg.de/gbld/version.txt"
-var UPDATEBASEURL = "http://gozilla.fhi.mpg.de/gbld"
+var UPDATEURL = "http://gozilla.fhi.mpg.de/gbld"
 
 var oses = []string{"darwin", "linux", "windows"}
 var arches = []string{"arm64", "amd64"}
@@ -34,7 +33,7 @@ var r1, r2, r3 *regexp.Regexp
 
 func main() { // ========================================================================================== main
   
-  checkforupdate()
+  checkforupdate(UPDATEURL)
 
   if len(os.Args) == 1 {                                                               // read predefined builds
     c, err := os.ReadFile("gbld.menu.json")
diff --git a/tools.go b/tools.go
index f0b81cd..21ff5c6 100644
--- a/tools.go
+++ b/tools.go
@@ -29,16 +29,14 @@ import (
 	"github.com/tidwall/gjson"
 )
 
-var tbversion = "0.4.3"
+var tbversion = "0.5.0"
 
 var CHRS = "VW9IdGJ6eXh1T25DRHdrc2M5MlhOQVNQcEJFWnJhWVY2ZEowaFJLdmoxNUdxVDRJZkZpTTdRZW0zTFc4Z2w="
 var LR = []rune("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
 
-
-
-func checkforupdate() { // --------------------------------------------------------------- check for new version
+func checkforupdate(URL string) { // ----------------------------------------------------- check for new version
 	prg := prgname()
-  resp, err := http.Get(VERSIONURL)
+  resp, err := http.Get(URL+"/version.txt")
 	if err == nil {
 		scanner := bufio.NewScanner(resp.Body)
 		if scanner.Scan() {
@@ -51,7 +49,7 @@ func checkforupdate() { // -----------------------------------------------------
 						ans:=Yesno(SF("new '%s' version found (%s -> %s), update now?",
 						  prg,sv_version,sv_lversion),true,false);
 						if (ans) {
-							updateurl:=SF("%s/%s_%s_%s_%s",UPDATEBASEURL,prg,lversion,runtime.GOOS,runtime.GOARCH)
+							updateurl:=SF("%s/%s_%s_%s_%s",URL,prg,lversion,runtime.GOOS,runtime.GOARCH)
 	
 							if err := doupdate(updateurl); err != nil {
 								PO(SF("Update failed: %v\n", err))
@@ -79,6 +77,25 @@ func doupdate(url string) error { // -------------------------------------------
 	return nil
 }
 
+func checkaccess(NETS []string) { // ------------------------------------------------- check ip net based access 
+	match:=0;
+	for _, validnet := range NETS {
+		addrs, err := net.InterfaceAddrs()
+		if err != nil { PE("Error getting addresses"); os.Exit(1) }
+		_, ipNet, err := net.ParseCIDR(validnet)
+		for _, address := range addrs {
+			if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+				if ipnet.IP.To4() != nil {
+					if (ipNet.Contains(ipnet.IP)) { match++ }
+				}
+			}
+		}
+	}
+	
+	if (match==0) { PE("access violation, permission denied"); os.Exit(1) }
+}
+
+
 func Enc(str string) string { // ----------------------------------------------------------------- encode string
 	enc, _ := basex.NewEncoding(Db64(CHRS))
 	return enc.Encode([]byte(Rndstr(2) + str))