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HPC Support
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Why do I see 'Connection Closed' when I try to log in to Comet?

'Connection Closed' is the message you receive when you try to ssh to a server and your access is denied. This can happen for a variety of reasons:

  • You have only just been added to your first Comet project - it takes 24 hours for project membership to be processed automatically and membership of at least 1 project is needed before Comet will accept your login
  • You have only just passed your driving test - it takes 24 hours for your driving test pass to be processed

other common causes:

  • Incorrect password (for users who have been at the University for over 10 years, it's worth changing your password. Comet doesn't accept the encryption on some older user accounts)
  • Incorrect server address - double check the details at connecting_onsite and remember to connect first to unix.ncl.ac.uk if connecting from offsite. It's best to try out ssh using fully qualified names (e.g. ssh na123@comet.hpc.ncl.ac.uk) at the command line before setting up your ssh config file.
  • System error - If all of the above are correct, and your login is still denied, please let us know by logging a ticket at https://nuservice.ncl.ac.uk/ (or call 208 5999)
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