Trouble Accessing Catalyst Center Sandbox - Reserved

Hello, Did any of you have trouble accessing Catalyst center sandbox - reserved lately. I'm getting the error as connection refused. Can connect to ISE and CML though. I can ping the DNAC IP. Saw that few people had the same problem on the Cisco community, but no any answers had been given. If you had the same issue did you find any workaround for that. Thank you in advance.