When I try to launch gradle UI, I got the following message in the console: Accept failed (9). Accept failed (10). Accept failed (11). Accept failed (12). Accept failed (13). Accept failed (14). Accept failed (15). Accept failed (16). Accept failed (17). Accept failed (18). Accept failed (19). Accept failed (20).
The UI will open but display an error message. After a couple of refresh, it would eventually succeed.