diff --git a/classes/MediaService.php b/classes/MediaService.php
index 83b80ad..729572f 100644
--- a/classes/MediaService.php
+++ b/classes/MediaService.php
@@ -30,7 +30,9 @@ class MediaService {
             CURLOPT_URL => $endpoint,
             CURLOPT_RETURNTRANSFER => true,
             CURLOPT_HTTPHEADER => ['Authorization: Bearer ' . $this->token],
-            CURLOPT_TIMEOUT => 15
+            CURLOPT_TIMEOUT => 15,
+            CURLOPT_IPRESOLVE => CURL_IPRESOLVE_V4,
+            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
         ]);
         $resp = curl_exec($ch);
         $http = curl_getinfo($ch, CURLINFO_HTTP_CODE);
@@ -125,12 +127,19 @@ class MediaService {
             CURLOPT_TIMEOUT => 180,
             CURLOPT_HTTPHEADER => $headers,
             CURLOPT_BUFFERSIZE => 65536,
+            CURLOPT_IPRESOLVE => CURL_IPRESOLVE_V4,       // Forzar IPv4 (IPv6 no funciona en este host)
+            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1, // Forzar HTTP/1.1 (HTTP/2 causa reset en lookaside.fbsbx.com)
         ]);
         $content = curl_exec($ch);
         $err = curl_error($ch);
         $http = curl_getinfo($ch, CURLINFO_HTTP_CODE);
         curl_close($ch);
-        if ($err || $http >= 400) return false;
+
+        // Log para diagnóstico
+        if ($err || $http >= 400) {
+            error_log("[MediaService::downloadUrl] FAIL url=" . substr($url, 0, 120) . " http={$http} err={$err}");
+            return false;
+        }
         return $content;
     }
 
diff --git a/services/WhatsAppService.php b/services/WhatsAppService.php
index 5987231..ee4cbd8 100644
--- a/services/WhatsAppService.php
+++ b/services/WhatsAppService.php
@@ -447,7 +447,9 @@ class WhatsAppService
                 'Authorization: Bearer ' . $this->token
             ],
             CURLOPT_TIMEOUT => 300,
-            CURLOPT_CONNECTTIMEOUT => 30
+            CURLOPT_CONNECTTIMEOUT => 30,
+            CURLOPT_IPRESOLVE => CURL_IPRESOLVE_V4,
+            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
         ]);
 
         $response = curl_exec($ch);
@@ -593,6 +595,8 @@ class WhatsAppService
             CURLOPT_FOLLOWLOCATION => true,
             CURLOPT_MAXREDIRS => 3,
             CURLOPT_HEADER => true, // Capturar headers de respuesta
+            CURLOPT_IPRESOLVE => CURL_IPRESOLVE_V4,
+            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
         ]);
 
         if ($method === 'POST' && $data) {
@@ -899,7 +903,9 @@ class WhatsAppService
                 'Authorization: Bearer ' . $this->token
             ],
             CURLOPT_TIMEOUT => 60,
-            CURLOPT_FOLLOWLOCATION => true
+            CURLOPT_FOLLOWLOCATION => true,
+            CURLOPT_IPRESOLVE => CURL_IPRESOLVE_V4,
+            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
         ]);
 
         $fileContent = curl_exec($ch);