diff --git a/src/app/admin/page.tsx b/src/app/admin/page.tsx
index 53f6f1c..11ce79f 100644
--- a/src/app/admin/page.tsx
+++ b/src/app/admin/page.tsx
@@ -1840,10 +1840,13 @@ export default function AdminPage() {
                         <Label htmlFor="ldap-url">Server-URL</Label>
                         <Input
                           id="ldap-url"
-                          placeholder="ldap://dc.example.com:389"
+                          placeholder="ldap://server:389  oder  ldaps://server:636"
                           value={ldapForm.url}
                           onChange={(e) => setLdapForm((f) => ({ ...f, url: e.target.value }))}
                         />
+                        <p className="text-xs text-muted-foreground">
+                          Port frei wählbar · Standard: 389 (LDAP), 636 (LDAPS) · Univention UCS: 7389 / 7636
+                        </p>
                       </div>
                       <div className="space-y-2">
                         <Label htmlFor="ldap-bind-dn">Bind-DN (Service-Account)</Label>
@@ -2102,10 +2105,13 @@ export default function AdminPage() {
                         <Label htmlFor="tldap-url">Server-URL</Label>
                         <Input
                           id="tldap-url"
-                          placeholder="ldap://dc.example.com:389"
+                          placeholder="ldap://server:389  oder  ldaps://server:636"
                           value={tenantLdapForm.url}
                           onChange={(e) => setTenantLdapForm((f) => ({ ...f, url: e.target.value }))}
                         />
+                        <p className="text-xs text-muted-foreground">
+                          Port frei wählbar · Standard: 389 (LDAP), 636 (LDAPS) · Univention UCS: 7389 / 7636
+                        </p>
                       </div>
                       <div className="space-y-2">
                         <Label htmlFor="tldap-bind-dn">Bind-DN (Service-Account)</Label>
@@ -3065,10 +3071,13 @@ function TenantLDAPDialog({ tenantID, onClose }: { tenantID: number; onClose: ()
                 <Label htmlFor={`atldap-url-${tenantID}`}>Server-URL</Label>
                 <Input
                   id={`atldap-url-${tenantID}`}
-                  placeholder="ldap://dc.example.com:389"
+                  placeholder="ldap://server:389  oder  ldaps://server:636"
                   value={form.url}
                   onChange={(e) => setForm((f) => ({ ...f, url: e.target.value }))}
                 />
+                <p className="text-xs text-muted-foreground">
+                  Port frei wählbar · Standard: 389 (LDAP), 636 (LDAPS) · Univention UCS: 7389 / 7636
+                </p>
               </div>
               <div className="space-y-2">
                 <Label htmlFor={`atldap-bind-dn-${tenantID}`}>Bind-DN (Service-Account)</Label>