Login access to the HPC clusters Awoonga, FlashLite, and Tinaroo is being affected by a network outage from the Polaris data centre at Springfield to UQ where HPC clusters rely on UQ St Lucia services.
There is also a problem with the batch system on FlashLite which can't be fixed until the network is fixed.
Further details can be found here: http://www2.rcc.uq.edu.au/hpc/index.html?RCC_Active_Incidents.html
There is currently no indication on when the network will be fixed.
UPDATE - 2017-12-19 - 17:30 - Network has been repaired and services restored.