To enable CISL to better secure and maintain the health and responsiveness of the Geyser and Caldera clusters, external SSH access to the Geyser and Caldera nodes will be turned off on December 17 at 8 a.m. No downtime is required for this change.
This will remove users' ability to log into these nodes directly from outside the Yellowstone environment. After the change, SSH attempts will result in the message, "Connection refused." However, SSH sessions active prior to the change should not be affected.
Users should continue to access the Geyser and Caldera clusters as described in CISL's documentation at http://www2.cisl.ucar.edu/resources/geyser_caldera.