diff --git a/backend/app.py b/backend/app.py
index e58c4ed..a46f2ce 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -29,10 +29,10 @@ templates = Jinja2Templates(directory="backend/templates")
 
 
 def get_oidc_client(settings: Settings = Depends(get_settings)) -> OIDCClient:
-    if settings.auth_mode != "oidc":
+    if not settings.oidc_enabled:
         raise HTTPException(
             status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
-            detail="OIDC auth not enabled",
+            detail="OIDC not configured",
         )
     try:
         return OIDCClient(settings)
@@ -59,7 +59,8 @@ def whoami(
     current_user: str = Depends(get_current_admin),
     settings: Settings = Depends(get_settings),
 ) -> dict:
-    return {"user": current_user, "auth_mode": settings.auth_mode}
+    auth_mode = "pam+oidc" if settings.oidc_enabled else "pam"
+    return {"user": current_user, "auth_mode": auth_mode}
 
 
 @app.post("/login", response_model=LoginResponse)
@@ -115,7 +116,7 @@ def oidc_callback(
     username = oidc.extract_username(claims)
     if not username:
         raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail="Missing username claim")
-    if not is_authorized_admin(username, settings):
+    if not is_authorized_admin(username, settings, mode="oidc"):
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="User not authorized to log in")
 
     token = issue_token(username, settings)
@@ -132,6 +133,11 @@ def oidc_callback(
     return redirect
 
 
+@app.get("/login/oidc/status")
+def oidc_status(settings: Settings = Depends(get_settings)) -> dict:
+    return {"enabled": settings.oidc_enabled}
+
+
 @app.get("/users", response_model=List[UserStatus], dependencies=[Depends(get_current_admin)])
 def users(settings: Settings = Depends(get_settings)) -> List[UserStatus]:
     logged_in = set(actions.list_logged_in_users())
diff --git a/backend/auth.py b/backend/auth.py
index a402bd4..b012197 100644
--- a/backend/auth.py
+++ b/backend/auth.py
@@ -1,7 +1,7 @@
 import datetime as dt
 import grp
 import pwd
-from typing import List, Set
+from typing import List, Set, Optional
 
 import jwt
 import pam
@@ -23,8 +23,8 @@ def _is_member_of(username: str, groups: Set[str]) -> bool:
     return bool(user_groups & groups)
 
 
-def is_authorized_admin(username: str, settings: Settings) -> bool:
-    if settings.auth_mode == "oidc":
+def is_authorized_admin(username: str, settings: Settings, mode: Optional[str] = None) -> bool:
+    if mode == "oidc":
         allowed_users = set(settings.auth_allowed_users)
         if allowed_users and username not in allowed_users:
             return False
@@ -46,12 +46,7 @@ def is_authorized_admin(username: str, settings: Settings) -> bool:
 
 
 def authenticate_admin_user(username: str, password: str, settings: Settings) -> None:
-    if settings.auth_mode != "pam":
-        raise HTTPException(
-            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
-            detail="Password login disabled; OIDC is configured",
-        )
-    if not is_authorized_admin(username, settings):
+    if not is_authorized_admin(username, settings, mode="pam"):
         raise HTTPException(
             status_code=status.HTTP_403_FORBIDDEN,
             detail="User not authorized to log in",
@@ -82,7 +77,12 @@ def decode_token(token: str, settings: Settings) -> str:
         raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token") from exc
 
     username = payload.get("sub")
-    if not username or not is_authorized_admin(username, settings):
+    if not username:
+        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token")
+    if not (
+        is_authorized_admin(username, settings, mode="pam")
+        or is_authorized_admin(username, settings, mode="oidc")
+    ):
         raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Unauthorized user")
     return username
 
diff --git a/backend/settings.py b/backend/settings.py
index 4a7ebbf..e4b1165 100644
--- a/backend/settings.py
+++ b/backend/settings.py
@@ -32,6 +32,9 @@ class Settings:
         self.oidc_state_cookie_name: str = os.getenv(
             "SKD_OIDC_STATE_COOKIE_NAME", "skd_oidc_state"
         )
+        self.oidc_enabled: bool = bool(
+            self.oidc_issuer and self.oidc_client_id and self.oidc_client_secret
+        )
         self.default_countdown: int = int(os.getenv("SKD_DEFAULT_COUNTDOWN", "60"))
         self.default_sound: bool = os.getenv("SKD_DEFAULT_SOUND", "false").lower() == "true"
         self.notify_timeout: int = int(os.getenv("SKD_NOTIFY_TIMEOUT", "5"))
diff --git a/backend/templates/index.html b/backend/templates/index.html
index c7011dc..257941c 100644
--- a/backend/templates/index.html
+++ b/backend/templates/index.html
@@ -18,11 +18,11 @@
   </header>
 
   <section>
-    <h3>Login (nur Root-User)</h3>
+    <h3>Login</h3>
     <p>Bevorzugt OIDC nutzen, falls konfiguriert. Die Anmeldung öffnet den Identity Provider und setzt eine Session-Cookie.</p>
     <button id="oidcLogin" type="button">Login via OIDC</button>
     <hr />
-    <p>Lokale Anmeldung (PAM) nur falls OIDC nicht verfügbar:</p>
+    <p>Lokale Anmeldung (PAM) ist immer moeglich:</p>
     <form id="loginForm">
       <div class="grid">
         <div>
@@ -84,7 +84,7 @@
     <div id="result" class="log"></div>
   </section>
 
-  <script>
+    <script>
     const statusDiv = document.getElementById('status');
     const resultDiv = document.getElementById('result');
     const loginStatus = document.getElementById('loginStatus');
@@ -136,6 +136,20 @@
       }
     }
 
+    async function checkOidcStatus() {
+      const button = document.getElementById('oidcLogin');
+      try {
+        const data = await api('/login/oidc/status');
+        if (!data.enabled) {
+          button.disabled = true;
+          button.title = 'OIDC nicht konfiguriert';
+        }
+      } catch (err) {
+        button.disabled = true;
+        button.title = 'OIDC-Status nicht erreichbar';
+      }
+    }
+
     async function refreshUsers() {
       statusDiv.textContent = 'Lade...';
       try {
@@ -206,6 +220,7 @@
     });
 
     checkSession();
+    checkOidcStatus();
   </script>
 </body>
 </html>