Hello,
I am getting the same problem on one of our sites. It is fine on all other sites, but I am getting this error for some:
2020-07-29 12:38:18: Error occurred while checking account status. Error: CONNECTION_ERROR : “cURL error 60: SSL: no alternative certificate subject name matches target host name ‘api.cleantalk.org'”
2020-07-29 12:38:18: Error occurred while API key validating. Error: Testing is failed. Please check the Access key.
Thanks