Description
The opsui web-application suffers from a Wicket issue where hitting the "back" button on the browser window can cause the current session to become invalid. Thus, the webapp consistently yields a 'Page Expired' error.
Reproducible steps:
1. Open up opsui
2. Click any link on the main page
3. Click any sub-link on the following page
4. Hit the browser's back button
5. Click a DIFFERENT link
6. You will see a 'Page Expired' error