Reported Outages

From approximately 1:50 AM to 8:30 AM on the Monday of May 6, 2026 the ChameleonCloud portal, JupyterHub, and Trovi systems were unavailable.

4:00 PM CDT: This issue is now resolved.

After last night's network outage, some remaining issues mean that launching new instances, and reconfiguring network interfaces are currently failing.

The suspected cause is a failure between the openstack control-plane services and the management control plane for our baremetal switches. Datacenter staff are investigating.

Connectivity to existing instances should not be impacted.

CHI@UC will be offline due to datacenter-wide power and cooling maintenance from 5:00 PM CDT on Monday, May 18th until 6:00 AM CDT on Tuesday, May 19th.

All instances, APIs, and services will be unavailable.

Please shut down your instances before 5:00 PM on the 18th — any remaining instances will be hard-powered off. Extend any leases expiring during this window beforehand.

If your workload must run uninterrupted, migrate to CHI@TACC, CHI@NCAR, or KVM@TACC in advance.

Due to a network outage at ANL, CHI@UC was experiencing intermitent connectivity issues starting around 10PM, Monday May 4th, and completely unavailable from 2AM to 8AM central time on Monday May 5th.

All services are now back to normal.

The root cause was an issue triggered during replacement of border routers on the Argonne Campus where CHI@UC is hosted.

The Chameleon user forum is down. We are working on bringing this back.

Resolved: The issue with the provisioning network has been resolved.

As of ~11:40AM on April 30th, the provisioning network at CHI@TACC appears down. This prevents launching new instances, shutting down or hard-rebooting existing ones, and making new leases.

Existing instances should *not* be affected.

Datacenter staff are investigating.

All service has been restored, though some users may experience a certificate error as DNS changes propagate. Please contact help@chameleoncloud.org if issues persist.

The Chameleon User Portal will be down breifly on May 5 at 9:30 CT as we migrate it to a new host. This migration is expected to take less than an hour. During this time, the site chameleoncloud.org will be unavailable, and you will not be able to create/extend leases at any Chameleon site.

Update: Work is complete, and VMs have been restarted.

At 9:00AM on Thursday, February 19, 2026, the H100 GPU hosts for KVM@TACC will be powered off for approximately one hour in order to perform urgent maintenance on the liquid cooling system to the rack. The VMs on these nodes will be shut down prior to poweroff and will be restarted when the maintenace is complete.

At 1:07 pm while Chameleon at TACC wass undergoing maintenance to datacenter uplinks, intermittent and brief interruptions were experienced during the transition.

We apologize for any inconvenience.

As of 3:15PM, the upstream issue, and the outage has resolved.

As of 2PM central time, auth.chameleoncloud.org became unreachable, with users seeing a cloudflare message about error code 522.
This is preventing sign-in to all chameleon sites, portal, and jupyter, although active sessions may continue to work until token expiry.

The outage is caused by an issue in our upstream provider's load-balancer, they are actively working on a resolution. We will update once we know more.