After a breakdown SDL Trados Studio 2019 refuses to connect to servers (e.g. Groupshare), although they are available, the credentials are correct, and internet connection is excellent. I have also tried to delete servers and add them again, but I got the following error message after the first step of setup: "Failed to connect to server. Please check your server connection settings, network and internet connections, and that the server is available". As mentioned above, everything is fine with internet connection etc. This problem affects all servers, not just a specific one.
Please let me know if you need further information and thank you very much for your help!