Clicking on the Feed icon of the Activity Stream gadget throws Error 401

Issue Summary

Clicking on the Feed icon of the Activity Stream gadget throws Error 401

This is reproducible on Data Center: yes

Steps to Reproduce

1. Install a vanilla instance of Jira
2. Create a project with sample data
3. Go to the System Dashboard
4. Click on the RSS Feed icon of the Activity Stream gadget

Expected Results

_The feed is displayed

Actual Results

An error 401 is displayed

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available