diff --git a/php/src/Data/ConfigurationManager.php b/php/src/Data/ConfigurationManager.php
index e8f27a4c..e691c7b7 100644
--- a/php/src/Data/ConfigurationManager.php
+++ b/php/src/Data/ConfigurationManager.php
@@ -242,6 +242,8 @@ class ConfigurationManager
 
         if ($response !== $instanceID) {
             error_log('The response of the connection attempt to "' . $testUrl . '" was: ' . $response);
+            error_log('Expected was: ' . $instanceID);
+            error_log('The error message was: ' . curl_error($ch));
             throw new InvalidSettingConfigurationException("Domain does not point to this server or the reverse proxy is not configured correctly. See the mastercontainer logs for more details. ('sudo docker logs -f nextcloud-aio-mastercontainer')");
         }