ci.jenkins.io is unable to allocate maven-XX-windows agents #5030
Description
Service(s)
ci.jenkins.io
Summary
The Windows agents with Apache Maven have not been allocated on ci.jenkins.io for at least 90 minutes. Jobs are blocked waiting for maven-17-windows and maven-25-windows
Builds that are waiting include:
- https://ci.jenkins.io/job/Core/job/jenkins/view/change-requests/job/PR-26414/1/
- https://ci.jenkins.io/job/Core/job/jenkins/view/change-requests/job/PR-26413/1/pipeline-overview/?selected-node=45
- https://ci.jenkins.io/job/Core/job/jenkins/view/change-requests/job/PR-26411/1/pipeline-overview/?selected-node=45
- https://ci.jenkins.io/job/Core/job/jenkins/view/change-requests/job/PR-26410/1/pipeline-overview/?selected-node=45
- https://ci.jenkins.io/job/Core/job/jenkins/view/change-requests/job/PR-26409/2/pipeline-overview/?selected-node=45
- https://ci.jenkins.io/job/Core/job/jenkins/view/change-requests/job/PR-26400/12/pipeline-overview/?selected-node=45
Reproduction steps
- Open https://ci.jenkins.io/ and expand the list of queue jobs to see that there are jobs waiting for a Windows agent
There are many entries in the log which report:
Mar 05, 2026 3:50:54 PM INFO hudson.plugins.ec2.EC2Cloud log
Connection allowed after the host key has been verified
Mar 05, 2026 3:50:54 PM WARNING hudson.plugins.ec2.EC2Cloud log
Authentication failed. Trying again...
I added a logger for hudson.plugins.ec2.EC2Cloud as https://ci.jenkins.io/manage/log/hudson.plugins.ec2.EC2Cloud/ and configured it to include all logs from that class at FINE level or above. It includes a line:
Available Total Agents: 1582 Available AMI agents: 34 AMI: ami-04ea9999e05f7b82a TemplateDesc: Spot Windows 2025 x86_64 with JDK25
It also includes a later line:
We have now 56 computers, waiting for 1 more