Department of Computer Science

IT Alerts & Scheduled Downtime

IT Alerts

The Mac Lab (Ms 222) is reserved for a class on Mondays, Wednesdays, and Fridays from 2:20–3:30 p.m. during the Fall 2025 semester and is not available for public use at those times.
New Hostname Available for CSX Nodes
We are pleased to announce that a new hostname, csx.cs.okstate.edu, is now available for connecting to the CSX environment.
- This hostname will automatically route users to a random available node in the range csx0 to csx4.
- This simplifies access and helps balance user load across CSX systems.
You may still connect to a specific node directly (e.g., csx1.cs.okstate.edu) if needed.
Important: SSH Host Key Changes
If you last connected to any CSX host previous to Summer 2025, you will likely encounter the following warning when using SSH:
This is expected and nothing to worry about.
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How to Resolve the SSH Warning
To resolve the SSH host key warning:
1. Remove the old host key from your known hosts file by running the following command:
  ssh-keygen -R csx0.cs.okstate.edu
2. Repeat above command for any other CSX node you previously connected to (csx1, csx2, etc.).
3. Reconnect via SSH — the system will prompt you to accept the new host key. Once accepted, you won’t need to do this again unless the host key changes again (which we do not anticipate).
4. PuTTY users may see a warning dialog when connecting. You can safely accept the new key and continue as normal.
Recent Change to CSX Login Credentials
Starting June 1, 2025, all CSX servers began using Okey credentials for authentication. This means you no longer need (or are able) to set a separate CSX-specific password.
Important Notes & Side Effects:
- The "pwreset" page has been retired and now automatically redirects to
  Change O-Key Password page.
- The
  passwd
  command on CSX will no longer function for users authenticated via Okey credentials.
- All individual accounts (existing and new) now use Okey credentials exclusively.
  ⤷ As a result, all previously set CSX-specific passwords has been discarded.
Apple Computers will be Transitioned to a new Computer Management System - Scheduled TBA

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IT Alerts & Scheduled Downtime

IT Alerts

Important: SSH Host Key Changes

How to Resolve the SSH Warning

Important Notes & Side Effects:

Scheduled Downtime