This issue is resolved.
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CloudBees DEV@cloud Jenkins may be intermittently affected by an ongoing maintenance event within Amazon Web Services, which provides the hosting for DEV@cloud. While Amazon has tried to limit the impact of this event, we are seeing issues with internal network routing between some instances.
We are working to move Jenkins instances off of these affected EC2 hosts. For the minority of Jenkins instances affected, this will result in a few minutes of downtime during the migration. We apologize in advance for any inconvenience. We are working with Amazon to better understand how to avoid this in the future.
