I have occasional issues. I just open the logs in the web admin and whitelist whatever is being blocked when the request fails.
For instance my fitness app just changed media hosts for their videos. I could login but not stream anything. It took about 2 minutes to find and fix the issue.
I usually start by clicking disable and trying again. If it works I know it's something the pi is blocking.
It isn’t as if you’re in a hurry to eat.