What port does HTTPS use?

443 by default. Plain HTTP uses 80. A URL can name another port explicitly, such as https://example.com:8443.

What is a proxy port?

The port your proxy server listens on. You enter it with the proxy host in your app; it has nothing to do with the port of the website you visit.

What port does SOCKS5 use?

1080 is the convention, but providers can use any port. Use the one your provider lists for SOCKS5.

What does connection refused mean on a proxy?

Your client reached the host but nothing accepted the connection on that port. The port is wrong, the proxy is down or a firewall rejected it.

What is port forwarding?

A router rule that sends incoming connections on a public port to a device inside your network. It is for hosting services, and proxies do not need it.

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What Is a Port Number?

A port is a number from 0 to 65535 that tells a computer which program or service an incoming connection is meant for. An IP address finds the machine; the port finds the service on it, such as 443 for HTTPS.

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how it works

How ports work

TCP and UDP both use 16-bit port numbers. A connection is identified by five values: source IP, source port, destination IP, destination port and protocol. Servers listen on fixed ports; your client picks a temporary (ephemeral) port for its side of each connection, which is how one laptop holds hundreds of connections at once.

IANA divides the range into well-known ports (0-1023), registered ports (1024-49151) and dynamic or private ports (49152-65535).

1
80
Service
HTTP
Where you meet it
Unencrypted websites
2
443
Service
HTTPS
Where you meet it
Almost every website and API
3
53
Service
DNS
Where you meet it
Name lookups
4
22
Service
SSH
Where you meet it
Server logins
5
1080
Service
SOCKS
Where you meet it
The conventional SOCKS proxy port
6
3128 / 8080
Service
HTTP proxies
Where you meet it
Common proxy and web-cache defaults

in practice

What a proxy port is

A proxy listens on a port of its own, and your client connects there instead of to the website. There is no standard proxy port: providers pick one and give it to you with the host, often as HOST:PORT:USERNAME:PASSWORD. The port only describes how you reach the proxy; the site you visit is still on 443 or 80.

CleanProxies lists the host and port for every proxy in the dashboard. Static ISP proxies accept HTTP(S) or SOCKS5 on the port shown for your order.

Port: key points

Connection refused means nothing listens on that host and port: check the port number in your proxy list.
A timeout often means a firewall on your side blocks outgoing traffic to unusual ports; corporate networks commonly do.
Use the same proxy port for http:// and https:// sites. The client tunnels HTTPS through it with CONNECT.
Some providers encode options such as session or location in the port; others put them in the username.

Is the proxy port reachable?Shell

nc -vz HOST PORT
# Connection to HOST port PORT [tcp/*] succeeded!

curl -x http://USERNAME:PASSWORD@HOST:PORT -I https://example.com

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