Failed to create drainer to sync to downstream TiDB. Is there an issue with my configuration?

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Original topic: 创建drainer同步至下游tidb失败了，请教下是我配置的有问题吗

| username: QH琉璃

[Test Environment for TiDB]
[TiDB Version] 6.5.8
Configuration and error are as follows:
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| username: 小龙虾爱大龙虾 | Original post link

Confirm whether the network to the downstream MySQL is connected.

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| username: 胡杨树旁 | Original post link

Is this the connection information for the downstream?

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| username: zhaokede | Original post link

Directly telnet in the console.

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| username: danghuagood | Original post link

It looks like the target type you want to synchronize is TiDB. The default port for TiDB is not 3306; you need to add the port information for TiDB.

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| username: WinterLiu | Original post link

Connection refused