From SciNet Users Documentation
Jan 9 2020, 9:24 AM: We received reports of troubles connecting into the SciNet data centre; we're investigating. Systems are up and running and jobs are fine.
As a work around, in the meantime, it appears to be possible to log into graham, cedar or beluga, and then ssh to niagara.
To prepare for the upcoming expansion of Niagara, there will be a
one-day maintenance shutdown on January 13th 2020, starting at 8 am
EST. There will be no access to Niagara, Mist, HPSS or teach, nor
to their file systems during this time.