In this case, please use the private network for access. For more information, please see Connecting to Database Instance.
ping by default. You can use telnet to check connectivity.
TencentDB for Redis does not support public network access for the time being. If you want to access it over the public network, you can do so through the iptable proxy on a CVM instance that has public network access.
iptable-based forwarding may be unstable; therefore, you are not recommended to access instances over the public network in the production environment.