after updating all Enterprise components from 11.1 to 11.3 I'm seeing this in the Portal logs.
Error before stopping configuration observer. C:\arcgisportal\content\items\portal\portal-config.properties (The system cannot find the path specified)
What's odd is that our content directory is: E:\arcgisportal\content
And, "portal-config.properties" file is missing from both C: and E:
When the upgrade was progressing through steps 1-7 initially it failed, because of a disk space issue. After that was increased, Retry upgrade worked without issue.
The map viewer is missing all the layers, and details on the left-hand pane also. Otherwise, everything seems to be working fine. License.json imported from My ESRI, no other issues; all Enterprise components successfully updated.
Help, please!
There may be an easy answer for you, but I don't have it.
I did want to mention though that I had a similar issue with a previous upgrade (several years/versions ago). After I realized what happened, we ended up rolling back the server, adding space, and trying again. Someone else may have different advice for you that may be a simpler solution, but in my case, a server restore was the best option.
Fortunately, this was just cached browser data causing the issue! I initially cleared Edge cache from "Last 7 days" selected, but I tried "All Time" when clearing it this time, and it's working great now!
Phew... didn't want to deal with this on a Fri evening.
Great news! (Don't forget to mark your response as the Solution)
I sometimes forget that is a thing for people because I both do that so often, and try to have everything auto-clear upon browser shutdown.