diff --git a/php/inc_fx_static_sync.php b/php/inc_fx_static_sync.php
index d1c7459..87e3877 100644
--- a/php/inc_fx_static_sync.php
+++ b/php/inc_fx_static_sync.php
@@ -58,7 +58,7 @@ class clsMysqlStaticSync extends clsMysql {
             return;
         }
 
-        mysqli_options($mysqli, MYSQLI_OPT_CONNECT_TIMEOUT, 3);
+        mysqli_options($mysqli, MYSQLI_OPT_CONNECT_TIMEOUT, 10);
 
         if (!@mysqli_real_connect(
             $mysqli,
@@ -68,6 +68,10 @@ class clsMysqlStaticSync extends clsMysql {
             $arrDatabase['db'],
             3306
         )) {
+            if (!isset($GLOBALS['ms1_static_sync_connect_errors'])) {
+                $GLOBALS['ms1_static_sync_connect_errors'] = array();
+            }
+            $GLOBALS['ms1_static_sync_connect_errors'][$arrDatabase['db']] = mysqli_connect_error();
             return;
         }
 
@@ -76,6 +80,25 @@ class clsMysqlStaticSync extends clsMysql {
     }
 }
 
+function fxStaticSyncConnectError($strDb) {
+    if (empty($GLOBALS['ms1_static_sync_connect_errors'][$strDb])) {
+        return '';
+    }
+
+    return $GLOBALS['ms1_static_sync_connect_errors'][$strDb];
+}
+
+function fxStaticSyncFormatConnectionError($tabEnv) {
+    $strDb = isset($tabEnv['config']['db']) ? $tabEnv['config']['db'] : '';
+    $strMsg = $tabEnv['label'] . ' (' . $strDb . ')';
+    $strErr = fxStaticSyncConnectError($strDb);
+    if ($strErr !== '') {
+        $strMsg .= ' — ' . $strErr;
+    }
+
+    return $strMsg;
+}
+
 function fxStaticSyncConnect($arrConfig) {
     if (empty($arrConfig['host']) || empty($arrConfig['db'])) {
         return null;
@@ -334,9 +357,28 @@ function fxStaticSyncLoadKeyedRows($objDb, array $tabDef, array $tabCompareCols
     );
 }
 
-/** Sync d'écriture interdite vers client prod (comparaison seule). */
+/** Tous les environnements cibles sont syncables (dev prod, client préprod, client prod). */
 function fxStaticSyncWriteAllowed($strEnvId) {
-    return $strEnvId !== 'client_prod';
+    return true;
+}
+
+function fxStaticSyncSetFlash($strMessage, $strType) {
+    $_SESSION['ms1_static_sync_flash'] = $strMessage;
+    $_SESSION['ms1_static_sync_flash_type'] = $strType;
+}
+
+function fxStaticSyncPopFlash() {
+    if (empty($_SESSION['ms1_static_sync_flash'])) {
+        return null;
+    }
+
+    $tabFlash = array(
+        'message' => $_SESSION['ms1_static_sync_flash'],
+        'type' => !empty($_SESSION['ms1_static_sync_flash_type']) ? $_SESSION['ms1_static_sync_flash_type'] : 'info',
+    );
+    unset($_SESSION['ms1_static_sync_flash'], $_SESSION['ms1_static_sync_flash_type']);
+
+    return $tabFlash;
 }
 
 function fxStaticSyncFinalizeCompareResult(array $tabCmp) {
diff --git a/php/sync_static_db.php b/php/sync_static_db.php
index eea01cb..47d793e 100644
--- a/php/sync_static_db.php
+++ b/php/sync_static_db.php
@@ -26,10 +26,15 @@ $strCsrf = fxStaticSyncEnsureCsrfToken();
 $strFlash = '';
 $strFlashType = 'info';
 
+$tabPopFlash = fxStaticSyncPopFlash();
+if (is_array($tabPopFlash)) {
+    $strFlash = $tabPopFlash['message'];
+    $strFlashType = $tabPopFlash['type'];
+}
+
 if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['action'] === 'sync') {
     if (!fxStaticSyncValidateCsrf($_POST['csrf'] ?? '')) {
-        $strFlash = 'Jeton CSRF invalide.';
-        $strFlashType = 'bad';
+        fxStaticSyncSetFlash('Jeton CSRF invalide.', 'bad');
     } else {
         $strTable = trim($_POST['table'] ?? '');
         $strEnvId = trim($_POST['env'] ?? '');
@@ -37,39 +42,41 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['action']) && $_POST['
         $tabEnv = fxStaticSyncFindEnvDef($strEnvId);
 
         if (!$tabDef || !$tabEnv || !empty($tabEnv['is_source'])) {
-            $strFlash = 'Paramètres invalides.';
-            $strFlashType = 'bad';
-        } elseif (!fxStaticSyncWriteAllowed($strEnvId)) {
-            $strFlash = 'Sync désactivée vers client prod — comparaison seule.';
-            $strFlashType = 'bad';
+            fxStaticSyncSetFlash('Paramètres invalides.', 'bad');
         } else {
             $tabConnections = fxStaticSyncOpenConnections();
             $objSource = $tabConnections['dev_preprod'];
             $objTarget = $tabConnections[$strEnvId];
 
             if (!$objSource || !$objTarget) {
-                $strFlash = 'Connexion BD impossible.';
-                $strFlashType = 'bad';
+                fxStaticSyncSetFlash(
+                    'Connexion BD impossible — ' . fxStaticSyncFormatConnectionError($tabEnv),
+                    'bad'
+                );
             } else {
                 $tabResult = fxStaticSyncCopyTable($objSource, $objTarget, $strTable, $tabDef);
                 if ($tabResult['ok']) {
                     $tabVerify = fxStaticSyncCompareEnvPair($objSource, $objTarget, $tabDef);
-                    $strFlash = $tabDef['label'] . ' → ' . $tabEnv['label'] . ' : ' . $tabResult['message'];
+                    $strMsg = $tabDef['label'] . ' → ' . $tabEnv['label'] . ' : ' . $tabResult['message'];
                     if ($tabVerify['status'] === 'ok') {
-                        $strFlash .= ' Vérification : aligné.';
-                        $strFlashType = 'ok';
+                        $strMsg .= ' Vérification : aligné.';
+                        fxStaticSyncSetFlash($strMsg, 'ok');
                     } else {
-                        $strFlash .= ' ATTENTION — après sync : '
+                        $strMsg .= ' ATTENTION — après sync : '
                             . fxStaticSyncStatusLabel($tabVerify['status'], $tabVerify) . '.';
-                        $strFlashType = 'bad';
+                        fxStaticSyncSetFlash($strMsg, 'bad');
                     }
                 } else {
-                    $strFlash = $tabDef['label'] . ' → ' . $tabEnv['label'] . ' — échec : ' . $tabResult['message'];
-                    $strFlashType = 'bad';
+                    fxStaticSyncSetFlash(
+                        $tabDef['label'] . ' → ' . $tabEnv['label'] . ' — échec : ' . $tabResult['message'],
+                        'bad'
+                    );
                 }
             }
         }
     }
+    header('Location: sync_static_db.php#sync-result');
+    exit;
 }
 
 $tabConnections = fxStaticSyncOpenConnections();
@@ -128,14 +135,14 @@ if ($strDetailTable !== '' && $strDetailEnv !== '') {
 <h1>Sync tables statiques</h1>
 <div class="warn-box">
     <strong>Attention — opération destructive.</strong>
-    Sync = recopie complète depuis dev préprod (efface la cible).
-    <strong>Client prod : lecture seule.</strong> Un clic sur Sync — pas de confirmation à taper.
+    Sync = recopie complète depuis dev préprod (efface la cible). Un clic sur Sync.
 </div>
 <p class="sub">
     Source de vérité : <strong>dev préprod</strong> (<code><?php echo ssEsc($arrConDatabasePreProd['db'] ?? ''); ?></code>).
-    Comparaison vers dev prod, client préprod et client prod (lecture seule pour prod).
+    Comparaison vers dev prod, client préprod et client prod.
 </p>
 
+<div id="sync-result"></div>
 <?php if ($strFlash !== '') { ?>
 <div class="flash flash-<?php echo ssEsc($strFlashType); ?>"><?php echo ssEsc($strFlash); ?></div>
 <?php } ?>
@@ -204,7 +211,12 @@ if ($strDetailTable !== '' && $strDetailEnv !== '') {
                 <?php if ($tabCmp['status'] !== 'ok' && $tabCmp['status'] !== 'no_connection') { ?>
                 <a class="btn" href="?detail_table=<?php echo urlencode($tabDef['table']); ?>&amp;detail_env=<?php echo urlencode($strEnvId); ?>">Détails</a>
                 <?php } ?>
-                <?php if ($tabCmp['status'] !== 'no_connection' && $tabCmp['status'] !== 'schema_mismatch' && fxStaticSyncWriteAllowed($strEnvId)) { ?>
+                <?php if ($tabCmp['status'] === 'no_connection') {
+                    $strConnErr = fxStaticSyncConnectError($tabEnv['config']['db'] ?? '');
+                    if ($strConnErr !== '') { ?>
+                <div class="count-hint"><?php echo ssEsc($strConnErr); ?></div>
+                <?php } } ?>
+                <?php if ($tabCmp['status'] !== 'no_connection' && $tabCmp['status'] !== 'schema_mismatch') { ?>
                 <form method="post" style="display:inline;">
                     <input type="hidden" name="action" value="sync">
                     <input type="hidden" name="csrf" value="<?php echo ssEsc($strCsrf); ?>">
@@ -212,8 +224,6 @@ if ($strDetailTable !== '' && $strDetailEnv !== '') {
                     <input type="hidden" name="env" value="<?php echo ssEsc($strEnvId); ?>">
                     <button type="submit" class="btn btn-sync">Sync →</button>
                 </form>
-                <?php } elseif (!fxStaticSyncWriteAllowed($strEnvId)) { ?>
-                <div class="count-hint">Lecture seule</div>
                 <?php } ?>
             </td>
             <?php } ?>