Connectivity Logs

I was looking at our connectivity logs and found a number of Failed connection entries.  The log states the connection was "MarkedUnhealthy". Is there a way to find out why it was marked unhealthy?

Thanks!

Failed connection to 107.173.255.185:25 (ConnectionRefused:0000274D)[TargetHost:host28.traderadar.cn:25|MarkedUnhealthy|FailureCount:52|NextRetryTime:2021-07-14T16:49:09.351Z][TargetIPAddress:107.173.255.185:25|MarkedUnhealthy|FailureCount:52|NextRetryTime:2021-07-14T16:49:09.351Z]