diff --git a/app/routers/qualys.py b/app/routers/qualys.py
index 7d4bbf7..4edb444 100644
--- a/app/routers/qualys.py
+++ b/app/routers/qualys.py
@@ -153,12 +153,16 @@ async def qualys_tags(request: Request, db=Depends(get_db),
         FROM qualys_tags
     """)).fetchone()
 
+    from ..services.qualys_service import is_refresh_running
+    sync_running = is_refresh_running()
+
     ctx = base_context(request, db, user)
     ctx.update({
         "app_name": APP_NAME, "tags": tags, "stats": stats,
         "search": search, "tag_type": tag_type,
         "can_edit_qualys": can_edit(perms, "qualys"),
         "msg": request.query_params.get("msg"),
+        "sync_running": sync_running,
     })
     return templates.TemplateResponse("qualys_tags.html", ctx)
 
diff --git a/app/templates/qualys_tags.html b/app/templates/qualys_tags.html
index e693c58..63ff244 100644
--- a/app/templates/qualys_tags.html
+++ b/app/templates/qualys_tags.html
@@ -6,13 +6,20 @@
     <div class="flex gap-2">
         {% if can_edit_qualys %}
         <form method="POST" action="/qualys/tags/resync" style="display:inline">
-            <button class="btn-sm bg-cyber-border text-cyber-accent" data-loading="Synchronisation des tags Qualys...|Cette opération peut prendre 1 à 2 minutes">Resync API</button>
+            <button class="btn-sm bg-cyber-border text-cyber-accent" {% if sync_running %}disabled title="Sync Qualys agents en cours"{% else %}data-loading="Synchronisation des tags Qualys...|Cette opération peut prendre 1 à 2 minutes"{% endif %}>Resync API</button>
         </form>
         {% endif %}
         <a href="/qualys/tags/export" class="btn-sm bg-cyber-green text-black">Export CSV</a>
     </div>
 </div>
 
+{% if sync_running %}
+<div class="card p-3 mb-4" style="border:1px solid #f59e0b;background:rgba(245,158,11,0.1)">
+    <span class="text-cyber-yellow font-bold">⏳ Synchronisation Qualys en cours</span>
+    <span class="text-xs text-gray-400 ml-2">Le bouton Resync API est désactivé. Patiente la fin du sync agents.</span>
+</div>
+{% endif %}
+
 {% if msg %}
 <div class="mb-3 p-2 rounded text-sm {% if 'error' in msg or 'ko' in msg %}bg-red-900/30 text-cyber-red{% else %}bg-green-900/30 text-cyber-green{% endif %}">
     {% if msg == 'resync_ok' %}Tags resynchronisés depuis l'API Qualys.{% elif msg == 'busy' %}⏳ Une synchronisation Qualys est déjà en cours (agents). Patiente quelques minutes puis réessaie.{% elif msg and msg.startswith('resync_ko') %}Erreur de synchronisation : {{ msg[10:].replace('+', ' ') if msg|length > 10 else 'API Qualys indisponible' }}{% elif msg == 'created' %}Tag créé.{% elif msg == 'create_error' %}Erreur création.{% elif msg == 'deleted' %}Tag supprimé.{% elif msg == 'delete_error' %}Erreur suppression.{% endif %}