G'day, All!
Federated Enterprise 11.1, no 'reverse proxies'
Even while using Incognito Mode (cleared cache): Trying to Interact with Portal Items generally fails...
"Open in Map Viewer" results in a blank white screen. "Page Unresponsive"
"Open in Map Viewer Classic" usually results in a map containing the Item of Interest.
Settings > Edit Extent ...Results in a "Failed to Fetch" error.
Has anyone else here encountered similar? Did you find a solution?
Have you checked your datastore?
In what way? I know it's there... I use ArcGIS Pro to publish things from it to the Portal&Server all the time.
Sorry, I should have been more specific. Have you run a describe datastore? Whenever I run into issues where items are not displaying it usually comes down to the datastore being messed up. That message "Failed to fetch" can indicate the datastore is not happy.
I would run a describe datastore, I would also look at your Portal index and see how it looks.