We have Temporary maintenance on the login nodes and application server as below:

Those two login nodes will remain available during the periods by carrying out the maintenance work on those login nodes in order. However, please be noted that all the sessions while logging in to those login nodes will become disconnected at the start of maintenance processing. You can use the "hostname" command to check the name(s) of the login nodes that you are currently using.

Thank you for your understanding and cooperation in advance.