connectex: No connection could be made because the target machine actively refused it.

关于阿里云服务器出现以下错误的原因：

connectex: No connection could be made because the target machine actively refused it.

出现以上错误的原因是因为对外暴露的接口无法对外访问。那么如果对应的端口确定是已经对外开启了那么其中的一个问题可能是

package mainimport ("fmt""net/http")func IndexHandler(w http.ResponseWriter, r *http.Request) {fmt.Fprintln(w, "hello world")}func main() {http.HandleFunc("/index", IndexHandler)http.ListenAndServe(":8051", nil) //这是正确的写法，
//           http.ListenAndServe("127.0.0.0:8051", nil) //这是错误的写法，}

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connectex: No connection could be made because the target machine actively refused it.

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