diff --git a/app/services/qualys_service.py b/app/services/qualys_service.py
index a44d05a..d6ec397 100644
--- a/app/services/qualys_service.py
+++ b/app/services/qualys_service.py
@@ -625,14 +625,23 @@ def _refresh_all_agents_impl(db, mode="diff"):
             "preferences": {"limitResults": 100},
             "filters": {"Criteria": criteria}
         }}
-        try:
-            r = requests.post(
-                f"{qualys_url}/qps/rest/2.0/search/am/hostasset",
-                json=payload, auth=(qualys_user, qualys_pass),
-                verify=False, timeout=600, proxies=proxies,
-                headers={"X-Requested-With": "PatchCenter", "Content-Type": "application/json"})
-        except Exception as e:
-            return {"ok": False, "msg": f"page {stats['pages']}: {e}", **stats}
+        # Retry sur erreurs transitoires proxy/reseau (max 3 essais)
+        r = None
+        last_err = None
+        for attempt in range(3):
+            try:
+                r = requests.post(
+                    f"{qualys_url}/qps/rest/2.0/search/am/hostasset",
+                    json=payload, auth=(qualys_user, qualys_pass),
+                    verify=False, timeout=600, proxies=proxies,
+                    headers={"X-Requested-With": "PatchCenter", "Content-Type": "application/json"})
+                break
+            except Exception as e:
+                last_err = e
+                import time as _t
+                _t.sleep(2 * (attempt + 1))  # backoff 2s, 4s
+        if r is None:
+            return {"ok": False, "msg": f"page {stats['pages']} apres 3 essais: {last_err}", **stats}
 
         if r.status_code != 200 or "SUCCESS" not in r.text:
             return {"ok": False, "msg": f"HTTP {r.status_code} page {stats['pages']}", **stats}