使用Golang GremlinGo连接AWS Neptune遇I/O超时问题求助

我正尝试通过Golang建立与AWS Neptune的连接，但始终未能成功。我可以正常连接其他AWS服务，但连接Neptune数据库时收到如下错误提示：

"no successful connections could be made: dial tcp 172.31.4.48:8182: i/o timeout"

我使用Gremlingo模块进行开发，代码如下：

package main

import (
    "fmt"
    "net/http"

    "github.com/aws/aws-sdk-go/aws"
    "github.com/aws/aws-sdk-go/aws/credentials"
    "github.com/aws/aws-sdk-go/aws/session"
    "github.com/aws/aws-sdk-go/service/neptune"
    "github.com/gin-gonic/gin"

    gremlingo "github.com/apache/tinkerpop/gremlin-go/v3/driver"
)

func main() {

    sess, err := session.NewSession(&aws.Config{
        Region:      aws.String("us-east-id1"),
        Credentials: credentials.NewStaticCredentials("AWS-id key", "aws secret id key", ""),
    })

    if err != nil {
        fmt.Println("Couldn't create new session")
        return
    }

    neptune.New(sess)

    driverRemoteConnection, err := gremlingo.NewDriverRemoteConnection("wss://database-1-instance-1.asdasdasd.us-east-1.neptune.amazonaws.com:8182/gremlin",
        func(settings *gremlingo.DriverRemoteConnectionSettings) {
            settings.TraversalSource = "g"
        })

    if err != nil {
        fmt.Println(err)
        return
    }

    //Cleanup
    defer driverRemoteConnection.Close()

    //Creating graph traversal
    g := gremlingo.Traversal_().WithRemote(driverRemoteConnection)

    // Perform traversal
    results, err := g.V().Limit(2).ToList()
    if err != nil {
        fmt.Println(err)
        return
    }

    // print results
    for _, r := range results {
        fmt.Println(r.GetString())
    }
}

我已经先后尝试连接集群本身和写节点，但均未成功，恳请帮忙排查问题。

内容的提问来源于stack exchange，提问作者LupefiascoMosdef