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Help Center/ TaurusDB/ FAQs/ Database Connections/ What Should I Do If an ECS Cannot Connect to a GaussDB(for MySQL) Instance?

What Should I Do If an ECS Cannot Connect to a GaussDB(for MySQL) Instance?

Updated on 2023-10-19 GMT+08:00

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Perform the following steps to identify the problem:

Check whether the ECS and GaussDB(for MySQL) instance are located in the same VPC.
- If they are in the same VPC, go to 2.
- If they are in different VPCs, create an ECS in the VPC where the instance is located.
Check whether a security group has been created for the ECS.
- If a security group has been created, check whether its rules are appropriate.
- If no security group has been created, go to the VPC console from the ECS details page and create a security group.
Check whether the ECS can connect to the instance over the instance port.

The default port of a primary/standby instance is 3306.
```
telnet <IP address> {Port number}
```
- If the ECS can connect to the instance, no further action is required.
- If the ECS still cannot connect to the instance port, contact technical support.

Parent topic: Database Connections

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