diff --git a/lizmap/modules/lizmap/lib/Request/OGCRequest.php b/lizmap/modules/lizmap/lib/Request/OGCRequest.php
index 5093b92b3d..a4b8a7c8fe 100644
--- a/lizmap/modules/lizmap/lib/Request/OGCRequest.php
+++ b/lizmap/modules/lizmap/lib/Request/OGCRequest.php
@@ -185,6 +185,57 @@ protected function constructUrl()
         return Proxy::constructUrl($this->parameters(), $this->services, $url);
     }
 
+    /**
+     * Generate a string to identify the target of the HTTP request.
+     *
+     * @param array $params The list of HTTP params
+     * @param int   $code   The HTTP code of the request
+     *
+     * @return string The string to identify the HTTP request, with main OGC parameters first such as MAP, SERVICE...
+     */
+    private function formatHttpErrorString($params, $code)
+    {
+        $message = '';
+
+        $paramsToLog = array('map', 'repository', 'project', 'service', 'request');
+        foreach ($paramsToLog as $paramName) {
+            if (array_key_exists($paramName, $params)) {
+                $message .= strtoupper($paramName)." '".$params[$paramName]."', ";
+            }
+        }
+
+        $message = rtrim($message, ', ');
+
+        return 'HTTP code '.$code.' on '.$message;
+    }
+
+    /**
+     * Log if the HTTP code is a 4XX or 5XX error code.
+     *
+     * @param int $code The HTTP code of the request
+     */
+    protected function logRequestIfError($code)
+    {
+        if ($code < 400) {
+            return;
+        }
+
+        $message = 'The HTTP OGC request to QGIS Server ended with an error.';
+
+        // The master error with MAP parameter
+        // This user must have an access to QGIS Server logs
+        $params = $this->parameters();
+        \jLog::log($message.' Check logs on QGIS Server. '.$this->formatHttpErrorString($params, $code).' : '.json_encode($params), 'error');
+
+        // The admin error without the MAP parameter
+        // but replaced by REPOSITORY and PROJECT parameters
+        // This user might not have an access to QGIS Server logs
+        unset($params['map']);
+        $params['repository'] = $this->project->getRepository()->getKey();
+        $params['project'] = $this->project->getKey();
+        \jLog::log($message.' '.$this->formatHttpErrorString($params, $code).' : '.json_encode($params), 'lizmapadmin');
+    }
+
     /**
      * Request QGIS Server.
      *
@@ -236,11 +287,15 @@ protected function request($post = false, $stream = false)
         if ($stream) {
             $response = \Lizmap\Request\Proxy::getRemoteDataAsStream($querystring, $options);
 
+            $this->logRequestIfError($response->getCode());
+
             return new OGCResponse($response->getCode(), $response->getMime(), $response->getBodyAsStream());
         }
 
         list($data, $mime, $code) = \Lizmap\Request\Proxy::getRemoteData($querystring, $options);
 
+        $this->logRequestIfError($code);
+
         return new OGCResponse($code, $mime, $data);
     }
 
diff --git a/lizmap/modules/lizmap/lib/Request/Proxy.php b/lizmap/modules/lizmap/lib/Request/Proxy.php
index 5a912b72f5..de3d433e1f 100644
--- a/lizmap/modules/lizmap/lib/Request/Proxy.php
+++ b/lizmap/modules/lizmap/lib/Request/Proxy.php
@@ -489,14 +489,14 @@ protected static function fileProxy($url, $options)
      * @param int    $httpCode The HTTP code of the request
      * @param string $url      The URL of the request, for logging
      */
-    public static function logRequestIfError($httpCode, $url)
+    protected static function logRequestIfError($httpCode, $url)
     {
-        $httpCodeClass = substr($httpCode, 0, 1);
-        // Change to str_starts_with when PHP 8.1 will be minimum version for all maintained version
-        if ($httpCodeClass == '4' || $httpCodeClass == '5') {
-            \jLog::log('An HTTP request ended with an error, please check the main error log. Code '.$httpCode, 'lizmapadmin');
-            \jLog::log('The HTTP request below ended with an error. Code '.$httpCode.' → '.$url, 'error');
+        if ($httpCode < 400) {
+            return;
         }
+
+        \jLog::log('An HTTP request ended with an error, please check the main error log. HTTP code '.$httpCode, 'lizmapadmin');
+        \jLog::log('The HTTP request ended with an error. HTTP code '.$httpCode.' → '.$url, 'error');
     }
 
     /**
diff --git a/lizmap/modules/view/locales/en_US/dictionnary.UTF-8.properties b/lizmap/modules/view/locales/en_US/dictionnary.UTF-8.properties
index b31e342c28..c6e52b4a84 100644
--- a/lizmap/modules/view/locales/en_US/dictionnary.UTF-8.properties
+++ b/lizmap/modules/view/locales/en_US/dictionnary.UTF-8.properties
@@ -1,6 +1,6 @@
 startup.error=An error occurred while loading this map. Some necessary resources may temporarily be unavailable. Please try again later.
 startup.error.administrator=Please notify the administrator of this map to <strong>connect</strong> and <strong>visit</strong> this map.
-startup.error.developer.tools=Maybe you will have a clue by opening your "Developer tools" in your web-browser. It's usually <kbd>F12</kbd>. Check "Console" and "Networks".
+startup.error.developer.tools=Maybe you will have a clue by opening your "Developer tools" in your web-browser. It's usually <kbd>F12</kbd>. Check "Console" and "Networks".\n\nVisit the administration panel and check in the log page if an HTTP request ended with an error related to this project.
 startup.user_defined_js=This map contains some users additional JavaScript scripts. This can be the cause of this message, try disabling them.
 startup.goToProject=Home
 startup.goToRepositoryAdmin=Maps management page