Can't upload big file


I use elgg 1.11 for my side, with only default plugins.
My hosting / php configuration is fine for below points :

  • file_uploads
  • upload_max_filesize
  • max_input_time
  • memory_limit
  • max_execution_time
  • post_max_size

But, I can't upload a mp3 file, with only 20mb.
any idea, how to fix this issue? or at least, how to debug? (I can't find any error in my hosting error file)

From chrome, I get below page after loading some minutes :

This webpage is not available