Generally we use ping, and TCPing is used when ping is disabled. I use Xiaoniao Cloud Inner Mongolia BGP cloud server. The performance is relatively stable, and the process of setting the TCPing command is also very smooth. The following method can be used For reference: tcping 59.36.100.206 tcping www.niaoyun.com tcping -t www.niaoyun.com tcping -t 59.46.9.195 3389 Note: tcping -t 59.46.9.195 3389 means to continuously ping the 3389 port of the server 59.36.100.195, remove it -t will only send the default 4 tcp packets. Directly enter in the linux server: [root@niaoyun ~]# tcping 123.184.33.150 3389 123.184.33.150 port 33890 open. Centos server installation: yum install tcping You can refer to the document: https://www.niaoyun.com/docs/15871. html/?utm_source=phpl-1130