There are many services that a server can provide, such as HTTP, FTP, Telnet and other services.Why can so many services be provided at the same time?A very important reason is that different ports are used to provide different services. For example, the TCP/IP protocol stipulates that the web defaults to port 80, and the FTP defaults to port 21.Through different ports, the computer can communicate with the outside world without interfering with each other.

Many users know port 80 and port 443, but don't understand these two ports. What is the difference between port 80 and port 443?Feifei will share with you today~

Port 80

Service: HTTP (HyperText Transport Protocol)
Description: For web browsing, the server listens to the port requested by the web client.You can access the website by adding ":80" to the HTTP address (the so-called "URL"), because the default port for browsing web services is 80, so you only need to enter the URL, instead of ":80".For example, http://www.idc02.com is actually accessing http://www.idc02.com:80.The Trojan Executor opens this port.

Port 443

Service: Https
Description: Web browsing port, another HTTP that provides encryption and transmission over a secure port.Some websites with high security requirements, such as banking, securities, shopping, etc., all use HTTPS services, so that the corresponding exchange of information on these websites can prevent others from seeing, and what other people capture is encrypted.data to ensure the security of transactions.The URL starts with https:// instead of the usual http://.

The difference between port 80 and port 443

1, different protocols

Port 80 is the HTTP (HyperText Transport Protocol) port, which is open to the HyperText Transport Protocol. This is the protocol most frequently used for Internet surfing, and is mainly used for WWW (World Wide Web), the protocol for transmitting information on the World Wide Web.

Port 443 serves HTTPS, which can be said to be HTTP based on SSL (Secure Sockets Protocol) secure connections.SSL/TLS runs at a level higher than TCP/IP, but lower than the application layer where HTTP is located. Therefore, HTTP can establish a connection on the basis of SSL connection, thereby realizing the security and confidentiality of HTTP connection.So HTTPS is actually a combination of two protocols, that is, SSL at the transport layer and HTTP at the application layer are used together.

2, different port vulnerabilities

Port 80: Some Trojans can use port 80 to attack computers, such as Executor, RingZero, etc.
Port 443: HTTPS services generally use SSL (Secure Socket Layer) to ensure security, but SSL vulnerabilities may be attacked by hackers, such as hacking online banking systems, stealing credit card accounts, etc.

3, different operations

Port 80 is to access the website by adding ":80" to the HTTP address (the so-called "URL"), because the default port number for browsing web services is 80, so you only need to enter the URL, no need to enter "":80".

Port 443 URLs start with https:// instead of the usual http://.Due to the certificate function of SSL/TLS, in order for the HTTPS protocol to work properly, at least the server must have a PKI certificate to prove the true identity of the service provider to the user connecting to the server, but not the client - because the certificate needs to be issued by the CAIssued and charged, and the client generally does not need to prove its identity to the server.

The above is about the sharing of port 80 and port 443, I hope it can help you~
Thank you for reading, please pay attention to not get lost~