Concordance search with SDL WorldServer stopped working after upgrading to Trados Studio 2021 SR2

I just upgraded to 2021 SR2 and the concordance search (using a WorldServer connection) is not working. The connection with the server looks fine, but I get a message that says: There was a problem while searching. See the Messages Window for more information. In the window, it reads "An error has occurred while using the translation provider DL WorldServer xxx.idiomworldserver.com:443...

Any ideas?

Thanks!

P.