how to check if port 80 is open

Source:Http://blog.chinaunix.net/u2/88533/showart_1815741.html Sometimes installProgramThe XX port is occupied. You can run the CMD command to check which program is occupied. 1. view the PID of the program corresponding to the port in netstat-ano, for example, C: \> netst

I would like to express my thanks for the code implementation of the following functions on the Internet.Of course, based on the Operation ideas in this example, you can implement more useful functions that you want to root.------------------------------ // TextBox1 is used to enter the port to be queried// TextBox2 is used to display original netstat-an informat

Problem description: In the process of system management, it is often encountered that the port is occupied when a process is started. For example, port 9090 is often occupied when the WebSphere console

The port is occupied and must be monitored. (This communication is simpler) Code Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net.Sockets;using System.Net;using System.Threading;namespace ConsoleApplication1{class

1, Void MySocket: OnConnect (int nErrorCode) { // TODO: Add your specialized code here and/or call the base class If (nErrorCode! = 0) // connection failed AfxMessageBox ("port closed "); Else AfxMessageBox ("Open Port "); CAsyncSocket: OnConnect (nErrorCode ); } 2, CString m_ipstr; MySocket m_socket; Void CTestDlg: OnConnect () { // TODO: Add your control noti

the netstat command is a useful tool for monitoring TCP/IP networks. It displays the route table, the actual network connection, and the status information of each network interface device, here I only use some of these features. Common netstat parameters:-T,-u,-W, and-x indicate TCP, UDP, raw, and UNIX socket connections. -A flag will also display the socket waiting for connection (that is, in listening m

Run the command: netstat-tunlp will display all ports and all corresponding programs. You can use the grep pipeline to filter out the desired keyword segments. For programs occupying port 22: Copy code example: [root @ leiwan tmp] # netstat-tunlp | grep 22tcp 0 0 0.0.0.0: 42957 0.0.0.0: * LISTEN 2230/rpc. statd tcp 0 0 0.0.0.0: 22 0.0.0.0: * LISTEN 2443/sshd tcp 0 0 127.0.0.1: 631 0.0.0.0: * LISTEN 2292/cupsd tcp 0 ::: 22 ::: * LISTEN 2443/sshd tcp 0:

be used:# echo-e "\ n" |telnet baidu.com 80|grep connectedconnection closed by foreign host. Connected to Baidu.com (123.125.114.144).Second: through Nmap to check whether the port is unobstructed# Nmap Etiantian.org-p starting Nmap 4.11 (http://www.insecure.org/nmap/) at 2012-07-22 17:22 pdtinterest ing ports on 211.

Use Telnet IP port number to view port opening, how to judge by return value? If the port is open, go directly to the port. Enter the Telnet IP port number in cmd, and there will be t

The example in this article describes how the Python scan IP segment will see whether the specified port is open. Share to everyone for your reference. The implementation methods are as follows: ? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26-27--28 29---30 31--32 33 34 35 36 37 38-39 40 41 42 45 46 47 48 49 50 51 52 53 54 55

After multiple tomcat servers are used for load balancing, the tomcat port is not open to the public, so the tomcat server Load balancer can be accessed precisely. Background: Use Nginx and two Tomcat servers to achieve load balancing, disable tomcat ports (8080 and 8090) in the firewall, and open only

Background: Load balancing was implemented with Nginx and two Tomcat, and Tomcat ports (8080 and 8090) were closed in the firewall, and only 80 ports were opened externally. The Nginx configuration is as follows: Upstream Tomcatcluster { Server : 8080; Server : 8090; } Server { Listen 80; server_name dev.xjj.cn ...... Location/{ ......

During Linux use, you need to know which ports are open to the current system, and to see the specific processes and users that open those ports, you can simply query by using the netstat command 2 The netstat command parameters are described below: -T: Indicates that the TCP port is displayed -U: Indicates that the

1, we often contact in the work are TCP,UDP ports are rarely used. The method for detecting whether a TCP port can be accessed outside is simple, and Telnet can test the results. For example, Telnet www.baidu.com 80 2, like the above test Baidu Server 80 p