diff --git a/CHANGELOG.md b/CHANGELOG.md
index 306a416..80f9ef9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,13 @@
 CHANGELOG
+## v0.0.7d (30.08.2026)
++ Firmware-Version als Build-Tag im Code und im Webinterface eingebaut
++ WLAN-Name für Segelflug- und Winden-Module angepasst (`Telemetry-<Callsign>` bzw. `Telemetry-Winch`)
++ Webinterface zeigt aktuell geladene Firmware-Version an
++ Speichern der Einstellungen springt nach dem Speichern auf die Startseite mit Erfolg/Fehlerstatus zurück
++ Captive-Portal / DNS-Weiterleitung für das Webinterface ergänzt
++ Access Point bleibt nur 5 Minuten nach PowerOn aktiv, wenn kein Client verbunden ist, und wird dann automatisch deaktiviert
++ AutoBuild und Release-Prozess für Versionsnamen, Prüfsummen und Release-Artefakte korrigiert
+
 ## v0.0.7c (28.08.2026)
 + korrektur AutoBuild (Checksum)
 
diff --git a/extra_script.py b/extra_script.py
index 5c66bd8..9b6661f 100644
--- a/extra_script.py
+++ b/extra_script.py
@@ -3,8 +3,10 @@ Import("env")
 
 # Access to global construction environment
 build_tag = env['PIOENV']
-version_tag = os.getenv("FIRMWARE_VERSION")
+version_tag = os.getenv("FIRMWARE_VERSION", "dev").strip()
 
+# CPPDEFINES ensures the macro expands to a valid C string literal instead of a bare identifier.
+env.Append(CPPDEFINES=[('FIRMWARE_VERSION', f'\\"{version_tag}\\"')])
 env.Replace(PROGNAME="firmware_%s_%s" % (build_tag, version_tag))
 
 # include toolchain paths
diff --git a/lib/webinterface/webinterface.cpp b/lib/webinterface/webinterface.cpp
index 11b0428..1dbe0bc 100644
--- a/lib/webinterface/webinterface.cpp
+++ b/lib/webinterface/webinterface.cpp
@@ -1,9 +1,11 @@
 #include "webinterface.h"
 #include <Arduino.h>
+#include <DNSServer.h>
 #include <Preferences.h>
 #include <Update.h>
 #include <WebServer.h>
 #include <WiFi.h>
+#include <cctype>
 
 namespace
 {
@@ -13,22 +15,57 @@ constexpr char default_callsign[] = "D1234";
 constexpr int default_min_speed = 80;
 constexpr int default_max_speed = 150;
 constexpr unsigned int default_active_time_seconds = 90;
+constexpr unsigned long access_point_timeout_ms = 5UL * 60UL * 1000UL;
+constexpr char telemetry_ap_prefix[] = "Telemetry-";
 
 String default_access_point_name()
 {
 #ifdef DEVICE_SAILPLANE
-  return String("Sailplane-") + default_callsign;
+  return String(telemetry_ap_prefix) + default_callsign;
 #else
-  return "Winde-Telemetry";
+  return String(telemetry_ap_prefix) + "Winch";
 #endif
 }
 
+String generated_access_point_name(const String &callsign)
+{
+#ifdef DEVICE_SAILPLANE
+  String safe_callsign = callsign;
+  if (safe_callsign.length() == 0)
+    safe_callsign = default_callsign;
+  return String(telemetry_ap_prefix) + safe_callsign;
+#else
+  return String(telemetry_ap_prefix) + "Winch";
+#endif
+}
+
+String url_encode(const String &value)
+{
+  String encoded;
+  encoded.reserve(value.length() * 3);
+  for (unsigned int i = 0; i < value.length(); ++i)
+  {
+    const char c = value.charAt(i);
+    if (std::isalnum(static_cast<unsigned char>(c)) || c == '-' || c == '_' || c == '.' || c == '~')
+      encoded += c;
+    else
+    {
+      char buffer[4];
+      snprintf(buffer, sizeof(buffer), "%%%02X", static_cast<unsigned char>(c));
+      encoded += buffer;
+    }
+  }
+  return encoded;
+}
+
 WebServer server(80);
+DNSServer dns_server;
 Preferences preferences;
 TelemetrySettings *active_settings = nullptr;
 bool restart_after_update = false;
 bool update_failed = false;
 bool access_point_restart_pending = false;
+unsigned long access_point_started_ms = 0UL;
 
 String html_escape(const String &value)
 {
@@ -41,6 +78,13 @@ String html_escape(const String &value)
   return escaped;
 }
 
+void redirect_to_root(const String &message, bool success)
+{
+  String location = String("/?status=") + (success ? "success" : "error") + "&msg=" + url_encode(message);
+  server.sendHeader("Location", location, true);
+  server.send(303, "text/plain; charset=utf-8", "");
+}
+
 void send_page(const String &message = String())
 {
   String page;
@@ -51,15 +95,19 @@ void send_page(const String &message = String())
             "body{font-family:sans-serif;max-width:38rem;margin:2rem auto;padding:0 1rem}"
             "label{display:block;margin-top:1rem}input{box-sizing:border-box;width:100%;padding:.6rem;font-size:1rem}"
             "button{margin-top:1rem;padding:.65rem 1rem;font-size:1rem}"
-            ".msg{padding:.6rem;background:#e5f4e8}small{color:#555}"
+            ".msg{padding:.6rem;background:#e5f4e8}.error{padding:.6rem;background:#fbe5e5}small{color:#555}"
             "</style></head><body><h1>Winden-Telemetry</h1>");
   if (message.length() > 0)
   {
-    page += F("<p class='msg'>");
+    page += F("<p class='");
+    page += String(message.startsWith("Fehler") || message.startsWith("Ungueltig") || message.startsWith("Invalid") ? "error" : "msg");
+    page += F("'>");
     page += html_escape(message);
     page += F("</p>");
   }
-  page += F("<form method='post' action='/settings'>"
+  page += F("<p><small>Firmware: ");
+  page += html_escape(firmware_version_string());
+  page += F("</small></p><form method='post' action='/settings'>"
             "<label>WLAN-Name<input name='ap_name' maxlength='32' required value='");
   page += html_escape(active_settings->access_point_name);
   page += F("'></label><label>WLAN-Passwort<input name='ap_password' type='password' minlength='8' maxlength='63' required value='");
@@ -92,12 +140,13 @@ bool parse_settings(TelemetrySettings &settings)
   callsign.trim();
   access_point_name.trim();
   access_point_password.trim();
-  if (access_point_name.length() == 0 || access_point_name.length() > 32 || access_point_password.length() < 8 || access_point_password.length() > 63 || callsign.length() == 0 || callsign.length() > 16 || min_speed < 0 || max_speed > 300 ||
+
+  if (callsign.length() == 0 || callsign.length() > 16 || access_point_password.length() < 8 || access_point_password.length() > 63 || min_speed < 0 || max_speed > 300 ||
       min_speed >= max_speed || active_time_seconds < 1 || active_time_seconds > 600)
     return false;
 
   settings.callsign = callsign;
-  settings.access_point_name = access_point_name;
+  settings.access_point_name = generated_access_point_name(callsign);
   settings.access_point_password = access_point_password;
   settings.min_speed = min_speed;
   settings.max_speed = max_speed;
@@ -107,7 +156,13 @@ bool parse_settings(TelemetrySettings &settings)
 
 void handle_root()
 {
-  send_page();
+  String message = server.arg("msg");
+  String status = server.arg("status");
+  if (status == "error" && message.length() == 0)
+    message = "Ungueltige Einstellungen";
+  else if (status == "success" && message.length() == 0)
+    message = "Einstellungen gespeichert.";
+  send_page(message);
 }
 
 void handle_settings()
@@ -115,7 +170,7 @@ void handle_settings()
   TelemetrySettings updated = *active_settings;
   if (!parse_settings(updated))
   {
-    server.send(400, "text/plain; charset=utf-8", "Ungueltige Einstellungen");
+    redirect_to_root("Ungueltige Einstellungen", false);
     return;
   }
 
@@ -131,8 +186,8 @@ void handle_settings()
   preferences.putInt("min", active_settings->min_speed);
   preferences.putInt("max", active_settings->max_speed);
   preferences.putUInt("active_time", active_settings->active_time_seconds);
-  send_page("Einstellungen gespeichert.");
   access_point_restart_pending = true;
+  redirect_to_root("Einstellungen gespeichert.", true);
 }
 
 void handle_update_upload()
@@ -188,6 +243,15 @@ void handle_update_result()
 }
 } // namespace
 
+String firmware_version_string(void)
+{
+#ifdef FIRMWARE_VERSION
+  return String(FIRMWARE_VERSION);
+#else
+  return "dev";
+#endif
+}
+
 bool webinterface_begin(TelemetrySettings &settings)
 {
   active_settings = &settings;
@@ -197,7 +261,7 @@ bool webinterface_begin(TelemetrySettings &settings)
   settings.access_point_password = preferences.getString("ap_password", default_access_point_password);
   settings.min_speed = preferences.getInt("min", default_min_speed);
   settings.max_speed = preferences.getInt("max", default_max_speed);
-    settings.active_time_seconds = preferences.getUInt("active_time", default_active_time_seconds);
+  settings.active_time_seconds = preferences.getUInt("active_time", default_active_time_seconds);
   if (settings.access_point_name.length() == 0 || settings.access_point_name.length() > 32 || settings.access_point_password.length() < 8 || settings.access_point_password.length() > 63 || settings.callsign.length() == 0 || settings.min_speed < 0 || settings.min_speed >= settings.max_speed ||
       settings.max_speed > 300 || settings.active_time_seconds < 1 || settings.active_time_seconds > 600)
   {
@@ -208,16 +272,24 @@ bool webinterface_begin(TelemetrySettings &settings)
     settings.max_speed = default_max_speed;
     settings.active_time_seconds = default_active_time_seconds;
   }
+  else
+  {
+    settings.access_point_name = generated_access_point_name(settings.callsign);
+  }
 
   WiFi.mode(WIFI_AP);
   bool ap_started = WiFi.softAP(settings.access_point_name, settings.access_point_password);
   if (!ap_started)
     return false;
 
+  access_point_started_ms = millis();
+  dns_server.start(53, "*", WiFi.softAPIP());
   server.on("/", HTTP_GET, handle_root);
   server.on("/settings", HTTP_POST, handle_settings);
   server.on("/update", HTTP_POST, handle_update_result, handle_update_upload);
   server.begin();
+  Serial.print("Firmware-Version: ");
+  Serial.println(firmware_version_string());
   Serial.print("Webinterface: http://");
   Serial.println(WiFi.softAPIP());
   return true;
@@ -226,6 +298,7 @@ bool webinterface_begin(TelemetrySettings &settings)
 void webinterface_handle(void)
 {
   server.handleClient();
+  dns_server.processNextRequest();
   if (access_point_restart_pending)
   {
     access_point_restart_pending = false;
@@ -233,6 +306,13 @@ void webinterface_handle(void)
     delay(100);
     if (!WiFi.softAP(active_settings->access_point_name, active_settings->access_point_password))
       Serial.println("Access Point konnte nicht neu gestartet werden");
+    access_point_started_ms = millis();
+  }
+
+  if (WiFi.softAPgetStationNum() == 0 && (millis() - access_point_started_ms) >= access_point_timeout_ms)
+  {
+    Serial.println("Access Point nach 5 Minuten ohne Client deaktiviert");
+    WiFi.softAPdisconnect(true);
   }
 }
 
diff --git a/lib/webinterface/webinterface.h b/lib/webinterface/webinterface.h
index 9dbdf60..c73fc3c 100644
--- a/lib/webinterface/webinterface.h
+++ b/lib/webinterface/webinterface.h
@@ -13,6 +13,7 @@ struct TelemetrySettings
   unsigned int active_time_seconds;
 };
 
+String firmware_version_string(void);
 bool webinterface_begin(TelemetrySettings &settings);
 void webinterface_handle(void);
 const TelemetrySettings &webinterface_settings(void);