The network at CERN will undergo maintenance on March 19th, 01:00 EDT to 07:00 EDT. During this time there are expected to be intermittent outages of the CERN network and LCG services.
Details of the intervention along with a list of services affected can be found at http://it-support-servicestatus.web.cern.ch/it-support-servicestatus/ServiceChangeArchive/090319-Network-Intervention.htm