[ixpmanager] "certificate verify failed" from grapher:email-ports-with-counts

[Marco d'Itri]

I understand what the message means, but I cannot find broken 
certificates anywhere.
What does this script do exactly?

----- Forwarded message from Cron Daemon <root> -----

To: md at linux.it
Subject: Cron <www-data at manager> /srv/ixpmanager/artisan
	grapher:email-ports-with-counts --discards noc at minap.it


                                                                               
  [ErrorException]                                                             
  stream_socket_enable_crypto(): SSL operation failed with code 1. OpenSSL Er  
  ror messages:                                                                
  error:1416F086:SSL routines:tls_process_server_certificate:certificate veri  
  fy failed                                                                    
                                                                               

----- End forwarded message -----

-- 
ciao,
Marco
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