This topic describes how to run the telnet command to check whether you can connect to a Lindorm instance through a specific port.
Prerequisites
The telnet client is installed on a Linux-based Elastic Compute Service (ECS) instance or the telnet client is enabled on a Windows-based ECS instance.
Background information
If a connectivity issue occurs on your Lindorm instance and a ping operation returns successful responses, you can run the telnet command to check the port connectivity.
Procedure
Log on to the ECS instance and run the following command in the command line:
telnet <host> <port>Sample command:
telnet ld-bp1mq0tdzbx1m****-proxy-lindorm-pub.lindorm.aliyuncs.com:33060NoteReplace host with the domain name in the endpoint that you obtained in Step 1. Replace port with the port number in the endpoint that you obtained in Step 1.
You can run this command in both Windows and Linux operating systems.
View the test result. In this example, the endpoint of the Lindorm time series engine is used.

Analyze the result
If a connection issue occurs in Lindorm but you can telnet to the Lindorm instance from the ECS instance, the ECS instance is connected to the Lindorm instance as expected. To resolve the issue, check other factors, such as clients, service code, and Lindorm service blocking issues that occur due to the configuration of the business environment. For more information, see Lindorm connection issues and solutions.