Just upgraded an on-premises CRM 2013 environment to on-premises CRM 2015. Everything is working fine, except for Activity Feeds.
Activity Feed posts appear normally on individual record walls, but the Personal Wall is not working, both on the What's New page and on Dashboards.
Instead of seeing the Personal Wall posts, filters and other components as expected, I simply see the following error message:
Activity Feeds is not available while working offline.
I tried republishing all the solutions, reverting to the default SiteMap, checked permissions were OK, and plenty of other troubleshooting things. I'm logged in via the web (not Outlook), tried from both IE11 and Chrome with the same results.
Anyone have a clue?