Starting after the maintenance Tuesday March 17, all CentOS 7 login nodes will no longer be directly accessible. MIT's 2-Factor authentication is requiring an upgrade to Duo that is not available on the older CentOS 7 operating system.
To access a CentOS 7 login node first log into orcd-login.mit.edu, which will direct you to one of our Rocky 8 login nodes. From there you can ssh to vlogin001. For example:
ssh USERNAME@orcd-login.mit.edu
[USERNAME@login007 ~]$ ssh vlogin001
Last login: Mon Feb 23 13:46:26 2026 from login005.inband
[USERNAME@vlogin001 ~]$
Once you are on vlogin001 you should be able to load CentOS 7 modules and run jobs on CentOS 7 partitions. Note that the CentOS 7 hardware will eventually be either updated or retired, so it is best to use the Rocky 8 part of the cluster if possible.