Most of my attempts to connect to various WFS services fails with different error messages.
Here is an example from open data stockholm where I actually was able to create the connection:
(I have removed the API-key. Contact me if you need to test)
When trying to query I get the following error:
Using the url without specifying typename
fails with the following:
Here is another example:
Here I can also connect but nothing is displayed.
Trying the same url:s in QGIS works fine.