diff --git a/platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/PluginDownloader.java b/platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/PluginDownloader.java
index 55440a7c90a8..75a7c922e459 100644
--- a/platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/PluginDownloader.java
+++ b/platform/platform-impl/src/com/intellij/openapi/updateSettings/impl/PluginDownloader.java
@@ -329,6 +329,7 @@ public class PluginDownloader {
 
     if (fileName == null || !PathUtil.isValidFileName(fileName)) {
       FileUtil.delete(file);
+      LOG.warn("Invalid file name (header=" + contentDisposition + "; url=" + connection.getURL() + "; name=" + fileName + ")");
       throw new IOException("Invalid filename returned by the server");
     }