...
Enterprise Tester has two plugins for JIRA: JIRA 4 - 5.1 and JIRA. The JIRA 4-5.1 is deprecated. We recommend that you upgrade to JIRA 5.2 or above.
Using JIRA 4 - 5.1 (Deprecated)
The JIRA 4 - 5.1 plugin supports JIRA 4.x and above. For issue and requirement synchronization, Enterprise Tester communicates with JIRA via the JIRA SOAP Service and some additional features have been added for JIRA 5 and above using the REST API. This plugin is being deprecated. No further feature development or bug fixes will occur on this plugin. We recommend that customers consider upgrading to JIRA 5.2 or above to get the full benefits of integrating Enterprise Tester and JIRA. This ET plugin will be removed when support ends for JIRA 5.1 in the release following Oct 2014.
...
An upgrade button on the JIRA 4-5.1 external system link will allow you to upgrade your plugin to the new JIRA plugin automatically. The new JIRA plugin is only compatible with JIRA 5.2 and above
Using JIRA 5.2 and above
...
For sharing Enterprise Tester report charts with JIRA dashboards and Confluence Wikis, configuration of OAuth is required. Note: The report chart portlet share feature is not compatible with OnDemand instances of JIRA and Confluence.
...