Replication Steps:

1. I add new "Amazon EC2" cloud from Manage Jenkins > Configure Clouds.
2. I fill in name, region, private key.
3. I click "Test Connection" button. Result is "Success".
4. I then add one AMI and fill in the required fields.
5. Then I click "Check AMI" button. It will give the correct AMI name.
6. But when I click "Apply" or "Save", the page renders "403 Forbidden".

I could not replicate this issue on Jenkins 2.263.4. It saves the AMI just fine.

I checked for hints in the following places, but nothing was logged regarding this issue:

• Logs from Manage Jenkins > System Logs
• Logs from journalctl
• Audit logs from the Audit Trail plugin (v3.11)
• Reports from the Monitoring plugin (v1.91.0)

I assume I have successfully established connection between the EC2 plugin and my Amazon account. So how come can I not save an AMI?