diff --git a/diagnostic/index.html b/diagnostic/index.html
index 4f363bd..db3dc0f 100644
--- a/diagnostic/index.html
+++ b/diagnostic/index.html
@@ -238,7 +238,7 @@
 
       <div style="border:1px solid #1E1E2E;border-radius:6px;padding:10px;">
         <div style="color:#E0E0F0;font-weight:600;margin-bottom:6px;">HTTP-Basic</div>
-        <input id="dc-http-user" placeholder="Benutzer" style="width:100%;margin-bottom:4px;">
+        <input id="dc-http-user" placeholder="Benutzer (optional)" style="width:100%;margin-bottom:4px;">
         <input id="dc-http-pass" type="password" placeholder="Passwort" style="width:100%;">
       </div>
 
@@ -4647,8 +4647,10 @@
         const c = document.getElementById('dc-snmp-community').value.trim();
         if (c) creds.snmp = { version: v, community: c };
       }
+      // HTTP-Basic: Benutzer optional (manche Geraete nutzen Password-only).
       const hu = document.getElementById('dc-http-user').value.trim();
-      if (hu) creds.http = { user: hu, pass: document.getElementById('dc-http-pass').value };
+      const hp = document.getElementById('dc-http-pass').value;
+      if (hu || hp) creds.http = { user: hu, pass: hp };
       // FritzBox: Benutzer optional (Password-only-Boxen haben keinen) — es reicht
       // ein Passwort. Gespeichert wird, sobald User ODER Passwort gesetzt ist.
       const fu = document.getElementById('dc-fb-user').value.trim();
diff --git a/satellite/satellite.py b/satellite/satellite.py
index 7e8954f..dd38ba1 100644
--- a/satellite/satellite.py
+++ b/satellite/satellite.py
@@ -622,8 +622,8 @@ def _do_http(action: str, params: dict) -> dict:
         pass
     user = params.get("user") or hcreds.get("user")
     pw = params.get("pass") or params.get("password") or hcreds.get("pass")
-    if user:
-        auth = (str(user), str(pw or ""))
+    if user or pw:   # Benutzer optional — manche Geraete nutzen Password-only-Basic-Auth
+        auth = (str(user or ""), str(pw or ""))
     r = requests.request(method, url, data=params.get("body"),
                          headers=params.get("headers"), auth=auth,
                          timeout=HTTP_TIMEOUT_SEC)