mysql Proxy to Public IP Issue with portainer and mysql8

### Bug Description

Problems occur when proxying mysql to a public IP.

### Versions

* frpc Version: 0.60.0
* frps Version: 0.60.0
* System Architecture: linux/amd64

### Configurations

#### FRPC

Service Server Address: https://github.com/fatedier/frp/blob/dev/conf/frpc_full_example.toml
serverAddr: xxx.xxx.xx.xxx

Service Server Port: 7000

Token:
[[proxies]]
name: mysql8
type: tcp
localIP: 172.18.0.2
localPort: 3308
remotePort: 3306

[[proxies]]
name: portainer
type: tcp
localIP: 172.17.0.2
localPort: 9000
remotePort: 9330

#### FRPS

https://github.com/fatedier/frp/blob/dev/conf/frps_full_example.toml
[common]
bind_port: 7000
dashboard_port: 7500
dashboard_user: admin
dashboard_pwd: admin