Steps to reproduce:
1. Start portal and login.
2. Add wiki portlet to page.
3. Click 'All Pages' for the first time.
All Pages will be shown on Wiki Porlet.
Will show "Wiki is temporarily unavailable" on Wiki Porlet.
Note: Only first time click 'All Pages', "Wiki is temporarily unavailable" will be shown. Refresh the page, All Pages will show normally. Then click 'All pages' will work as expected.