with the latest version 1.2.9 I started experiencing problem when trying to upload screenshots to Jira via, otherwise, extremely helpful and super cool Jira plugin. With the same rig and with the previous version of Greenshot I had not a single problem. The address of the jira server is verified, connectivity and availability of the service is verified. As I said it used to work just fine before.
steps to reproduce:
1. take a screenshot.
2. Open it in the greenshot editor
3. click on the "Uplod to Jira" button.
And I receive the following error message with the consecutive dump: