external port

Record the experiences of debugging serial port device bugs and debugging serial port bugs It took almost one day to get a Bug. The Bug is as follows: This Bug is especially unique. It is reported every time the end user uses the software without any prompt on the development computer. I carefully thought about the newly added features in the source code and did not find any obvious problems. Therefore, t

C ++ port scanner and Port ScannerI. Principle The principle of port scanning is very simple, that is, to establish socket communication and switch over the port without passing through the connect function. If it succeeds, it indicates the port developer; otherwise, the

Python implements simple port scanner code instances and python Port Scanners I have added some new content on the basis of some information on the Internet. It is a Python socket programming expert. # Coding = utf-8import socketimport timeimport sysimport structimport threadingfrom threading import Thread, activeCountresults = [] def portScanner (ip, port): serv

Port 80 occupied, port 80 "Who occupies port 80? How can I check and terminate it? ", Here I will briefly explain how to check port 80 usage in windows? Which process is occupied? How to terminate. Here we mainly use the dostool in windows. Click "start" -- "run", enter "cmd", and click "OK" to enter the DOS window. Th

Python to monitor the port usage of the device, python to monitor the port usage of the device This example describes how to monitor the port usage of a device using Python. Share it with you for your reference. The details are as follows: Recently, due to work requirements, the above requirements need to be reported daily O M of hundreds of

MAC OS is essentially a UNIX system, and UNIX systems are mostly non-root users that are not able to use a common port less than 1024 by default. At this time if you need to use 80 ports in your development, such as Tomcat, for example, Vitualbox An HTTP service has been built and you need to do some system port forwarding if you want to access it directly from the browser's localhost (without the ":

Port Multiplexing is the focus, as long as the use of stm32 is used to peripherals, peripherals are shared with the Gpio pin (multiplexing), that is, some pins can be purely as input and output, but also as a certain function of peripheral (such as ADC, serial port and so on) pin port.This is an advantage of stm32, which saves the number of pins.Port multiplexing and remap pin correspondence can be queried

Windows is the host machine, and Linux is installed in the vmwarevm. You can also write a program in Linux to send messages to the serial port. The same principle is to use the virtual serial port software vspm to connect com3 to com4 and then capture it through the serial port debugger. The following is a C sample code for the serial program in Linux. The use a

Iptables implementation of Port forwarding, port mapping and two-way access is not difficult to configure, see below: Allow packet forwarding: #echo 1 >/proc/sys/net/ipv4/ip_forward Forwarding TCP 8081 to xx.xx.xx.xx: #iptables-T nat-i prerouting-p tcp–dport 80-j dnat–to xx.xx.xx.xx Enable the forwarding packet to implement a "two-way path" and set a correct return channel for the packet: #iptables-T

This indicates that port 80 (which is the Tomcat listening port) has been occupied by other programs. First, run the "netstat-ano" command to display the port status, and then find the port in the result, then, search for the corresponding program in the display of the input "tasklist" command based on its PID, And you

The 16c2550 serial port chip can be used to expand two serial ports. Its operation method and register usage are exactly the same as 8250, so we can use the classic 8250 driver in Linux to drive st16c2550. 8250 the driver remains unchanged. You need to add the 16c2550 initialization code. In the initialization code, you need to set the chip selection and IRQ pin for 16c2550, configure the read/write timing for the 16c2550 peripherals (setup, pulse, cy

Purpose: The integration of Apache and Tomcat allows both Java and PHP projects to share port 80. when accessing a website, you do not need to add a port number in the address bar. Environment Description: Linux CentOS 32-bitApache 2.2.2Tomcat 7.0.37 Preparations: Download mod_jk.soHttp://archive.apache.org/dist/tomcat/tomcat-connectors/jk/binaries/Open the link and find the appropriate file to download.

Centos7 uses the firewall: lt; 1 gt; for example, to query whether port 9200 is opened by the following command: firewall-cmd -- query-port = 9200/tcp, return yes, indicating to open lt; 2 gt; run the following command to open port 9300: firewall-cmd -- add-p Centos 7 adopts the firewall: Command: firewall-cmd -- query-p