Two new login nodes were added to the Argon HPC systerm.
There was an initial problem with the ssh keys on these two new machines. You may get prompted to remove the host key for the round-robin DNS name of argon.hpc.uiowa.edu if you have already logged in to one of these machines. The host key is correct now so it can safely be accepted into your known_hosts file.
Update (2/5/2021): For some as yet undetermined reason, qlogin do not work from the new login nodes. This is being investigated.
Update (2/6/2012): The issue with failed qlogins on the new login nodes has been resolved.