What Is HTTPS Port 443? 🔒 Port 80 vs 443 Explained

Learn what HTTPS Port 443 is, why it secures web traffic, and how it compares to HTTP Port 80. Discover the key differences, common uses, and security benefits.

Last Updated: by Susith Nonis 16 Min
What Is HTTPS Port 443? 🔒 Port 80 vs 443 Explained

The default HTTPS port is 443. That's it. If you came here for the one-line answer, you've got it. Port 8443 shows up a lot too, but it's an alternative port — usually for app servers and admin panels — not the standard. So don't let anyone tell you 8443 is a default HTTPS port. It isn't.

Protocol Default Port Common Alternative
HTTP 80 8080
HTTPS 443 8443
Infographic comparing HTTP 80, HTTPS 443, Alternate HTTP 8080, and Alternate HTTPS 8443
Infographic comparing HTTP 80, HTTPS 443, Alternate HTTP 8080, and Alternate HTTPS 8443

What is HTTPS port? [Default HTTPS port number]

It stands for "Hypertext Transfer Protocol Secure." HTTPS ports encrypt connections using SSL or TLS to provide an extra layer of security when accessing a site. Each HTTPS port has its own unique number that distinguishes it from the others. A port is just a numbered doorway on your server — your server has one IP address but runs lots of services (web, email, SSH, databases), and ports tell incoming traffic which service it's looking for. Think of the IP address as a building and the port as the apartment number.

Default HTTPS Port 443 is used for HTTPS connections that protect web browser communication. For instance, when you access an HTTPS website, it sends a request to its hosting server for special services using network port 443. Then the server connects to the requested port, which is encrypted in the case of HTTPS, to send the service to the website. Every browser assumes 443 when you type https://, which is why you never see https://example.com:443 in the address bar — the port is implied. This isn't random: the IANA assigns 443 to HTTPS, and it's an internet-wide convention, not something individual hosts get to redefine. As a result, people who use web hosting servers can send and receive data over the Internet without any security concerns.

How HTTPS encrypts data during transmission over a network

HTTPS uses SSL or TLS certificates to encrypt and protect data transmission. The stack in plain terms: HTTPS = HTTP over TLS over TCP. Your browser opens a TCP connection to port 443, negotiates a TLS session, then sends ordinary HTTP requests inside that encrypted tunnel. SSL and TLS work the same way, and many use these terms interchangeably. However, TLS is the updated and more advanced version of SSL — nowadays, more and more HTTPS websites are improving their protocol to the TLS version, which is more secure.

Vertical HTTPS protocol stack diagram showing Browser, HTTP, TLS, TCP, and Port 443 with request and response arrows.
Vertical HTTPS protocol stack diagram showing Browser, HTTP, TLS, TCP, and Port 443 with request and response arrows.

What happens during the TLS handshake

The handshake is the part most people gloss over. Quickly: the client says hello (advertising cipher suites and, via SNI, the hostname it wants), the server presents its X.509 certificate, both sides agree on keys, and the session goes encrypted. ALPN gets negotiated here too — that's how HTTP/2 vs HTTP/1.1 gets picked.

TLS handshake diagram showing ClientHello, ServerHello plus certificate, key exchange, and Finished on port 443
TLS handshake diagram showing ClientHello, ServerHello plus certificate, key exchange, and Finished on port 443

A note about HTTP/3 and QUIC

Old wisdom says "HTTPS always uses TCP." Mostly true — but not anymore in every case. HTTP/3 runs over QUIC, which sits on UDP (still port 443). So if someone asks "does HTTPS use TCP or UDP?" the honest answer is: traditionally TCP, but modern HTTP/3 uses UDP via QUIC.

What is the difference between the HTTPS and SSL/TLS protocols?

Websites run on HTTPS protocol, while HTTPS runs over an SSL/TLS certificate. TLS is the updated and more advanced version of SSL. It is installed on a web hosting server to provide a secure and encrypted connection between a website and a web browser. The SSL protocol authenticates users' identities whenever they want to transmit information. Then HTTPS provides the channel to transfer that information to the server.

HTTPS vs HTTP: Difference you should know

Websites that use SSL certificates run on HTTPS, while sites with no SSL or TLS run over an HTTP port. The HTTPS protocol determines that data transmitted over the channel is encrypted and impossible to read, while websites using the HTTP protocol send and receive data in plain text. Be careful when sending sensitive data, like credit card details, personal information, login credentials, etc., online. Ensure a website uses the HTTPS protocol to encrypt data and validate its identity. However, URLs preceded by the HTTP protocol are unsafe and may use your data for other purposes.

Port Protocol Encrypted? Typical Use
80 HTTP No Legacy / redirects to HTTPS
443 HTTPS Yes Standard secure web traffic
8080 HTTP (alt) No Proxies, dev servers, app containers
8443 HTTPS (alt) Yes Tomcat, admin panels, secure APIs

Distinguish between the HTTP and HTTPS Protocols

To make sure a website is using an SSL/TLS certificate, you have two main ways:

  • Read the URL before clicking on a website link in the browser. If the URL starts with HTTPS protocol, your data will be safe.
  • Look for the padlock icon preceding the website's domain name in the search bar after visiting it. You can see the site's information and connection details by clicking on the padlock.

Most Common HTTPS Ports

Port 443

As the bedrock of secure internet communication, Port 443 serves as the primary gateway for HTTPS connections. This digital sentinel encrypts data using SSL or TLS protocols, transforming plain text into an unreadable algorithm during transmission. Recognizable by the "https://" prefix in URLs and the reassuring padlock icon in browsers, Port 443 plays a pivotal role in fortifying online security. Its deployment ensures a protected conduit for sensitive information, such as personal details and financial transactions, shielding users from potential eavesdroppers and cyber threats.

Port 8443

In the realm of secure internet communication, Port 8443 emerges as a notable alternative to the default HTTPS port. While both ports share the common goal of encrypting data for enhanced security, Port 8443 often finds its niche in specific applications and services. The Apache Tomcat server uses port 8443 as its default secure connector. Port 8443 creates a pair of keys for each individual using the browser, then hides it within the web browser to authenticate the user and provide a secure communication channel. It's also used for admin dashboards, internal panels, reverse proxies, and staging — when 443 is already claimed by your main app and a backend needs its own HTTPS endpoint.

When you use 8443 (or any non-standard port), the browser won't assume it. You have to spell it out: https://example.com:8443.

Other HTTPS ports

Many other HTTPS port numbers are available that provide similar services. Here are a few of them:

  • Port 832: NETCONF for SOAP over HTTPS, catering to network configuration needs.
  • Port 5989: WBEM CIM-XML (HTTPS), serving as a standard for web-based enterprise management.
  • Port 8243: Synapse Non-Blocking HTTPS, offering a non-blocking approach to secure communication.
  • Port 16993: Intel(R) AMT SOAP/HTTPS, addressing secure communication in Intel's Active Management Technology.
  • Port 20003: Commtact HTTPS, facilitating secure communication specific to Commtact services.

How to Enable Port 443 and Port 8443

Before diving into the intricacies of enabling Ports 443 and 8443, it's essential to understand the significance of these ports in ensuring secure online communication. Port 443, the default for HTTPS, serves as the gateway for encrypted data exchange, while Port 8443 often plays a specific role in secure web services. Enabling these ports on various operating systems is a crucial step in fortifying your system against potential security threats.

Enable Ports 443 and 8443 on Windows

Securing your Windows environment by enabling Ports 443 and 8443 is vital for establishing encrypted and secure connections. Follow these steps to configure your Windows firewall:

  • Access Windows Firewall Settings: Go to the Control Panel on your Windows system. Locate and select "System and Security." Click on "Windows Firewall" to access firewall settings.

Enable Ports 443 and 8443 on Windows

  • Navigate to Advanced Settings: On the left sidebar, find and click on "Advanced settings." This opens the "Windows Defender Firewall with Advanced Security" window.

Enable Ports 443 and 8443 on Windows

  • Create New Inbound Rules: Right-click on "Inbound Rules" and choose "New Rule." In the New Inbound Rule Wizard, select "Port" and click "Next."

Enable Ports 443 and 8443 on Windows

  • Specify Port 443: Choose "TCP" and check "Specific local ports." Enter "443" and click "Next."

Enable Ports 443 and 8443 on Windows

  • Allow the Connection: Select "Allow the connection" and proceed with the wizard. Choose the appropriate settings for domain and private networks.

Enable Ports 443 and 8443 on Windows

  • Name the Rule: Provide a meaningful name for the rule and click "Finish."

Enable Ports 443 and 8443 on Windows

  • Repeat for Port 8443: Repeat the process, creating a new rule for Port 8443 with the same steps.

Enable Ports 443 and 8443 on macOS

Securing Ports 443 and 8443 on macOS is essential for maintaining a robust and protected online environment. Follow these steps to enable these ports on your macOS system:

  1. Access System Preferences: Open the "System Preferences" on your macOS.
  2. Navigate to Security & Privacy: Click on "Security & Privacy" to access the security settings.
  3. Open Firewall Options: In the Security & Privacy window, select the "Firewall" tab. Click on the "Firewall Options" button.
  4. Add Application Rules: Click on "Add" to add rules for specific applications. Choose an application from the Applications folder and click "Add."
  5. Allow Incoming Connections: Ensure that the option next to the selected application is set to "Allow incoming connections."
  6. Open Specific Ports (For Advanced Users): For advanced users, open Terminal. Stop the active packet filter using sudo pfctl -d. Use a text editor to open the configuration file for the packet filter: sudo nano /etc/pf.conf. Add rules for Ports 443 and 8443, following the given examples. Save the file and restart the firewall with sudo pfctl -E.

Enable Ports 443 and 8443 on macOS

Enable Ports 443 and 8443 on Ubuntu

Configuring Ports 443 and 8443 on Ubuntu is pivotal for establishing a secure network connection. Follow these steps to enable these ports on your Ubuntu system:

  • Utilize Uncomplicated Firewall (ufw): Open a terminal on your Ubuntu system.
  • Allow Port 443: Execute the following command to enable traffic on Port 443:
sudo ufw allow 443

Enable Ports 443 and 8443 on Ubuntu

  • Allow Port 8443: Similarly, enable traffic on Port 8443 with the command:
sudo ufw allow 8443

Enable Ports 443 and 8443 on Ubuntu

  • Verify Changes: Confirm that the changes have taken effect by checking the firewall status:
sudo ufw status

Enable Ports 443 and 8443 on CentOS

Securing your CentOS system involves configuring Ports 443 and 8443 to ensure encrypted and protected communication. Follow these steps:

  • Use Firewall-cmd: Open a terminal on your CentOS system.
  • Allow Port 443: Execute the following command:
sudo firewall-cmd --add-port=443/tcp --permanent

Enable Ports 443 and 8443 on CentOS

  • Allow Port 8443: Similarly, enable traffic on Port 8443:
sudo firewall-cmd --add-port=8443/tcp --permanent
  • Reload Firewall: Reload the firewall to apply the changes:
sudo firewall-cmd --reload
  • Verify Changes: Confirm that the changes have taken effect:
sudo firewall-cmd --list-ports

Enable Ports 443 and 8443 on CentOS

How to Check Whether Port 443 Is Open

A few commands cover almost every situation. On Linux, check what's listening locally:

ss -tulpn | grep :443
sudo ufw status

Test the live endpoint with curl:

curl -I https://example.com

Scan remotely with nmap to see if the port's reachable from outside:

nmap -p 443 example.com

On Windows, netstat -an | findstr :443 works in a pinch. And the simplest test of all? Just open the site in a browser and look for the padlock. If you want more, our piece on how to check open ports in Linux goes further.

Stylised terminal illustration showing nginx listening on HTTPS port 443
Stylised terminal illustration showing nginx listening on HTTPS port 443

What You Actually Need to Enable HTTPS

Opening port 443 in your firewall does not give you HTTPS. The port's just the doorway — you still need someone home. Your checklist:

  • DNS pointing to the server's IP
  • A valid SSL/TLS certificate installed
  • A web server actually listening on 443
  • Firewall (and any cloud security group) allowing inbound 443
  • An HTTP-to-HTTPS redirect — see our guide on how to force HTTPS
  • Auto-renewal set up so the cert doesn't expire on you

Example server configs

Minimal Nginx server block for HTTPS:

server {
    listen 443 ssl;
    server_name example.com;
    ssl_certificate     /etc/ssl/certs/example.crt;
    ssl_certificate_key /etc/ssl/private/example.key;
    root /var/www/html;
}

Apache VirtualHost on 443:

<VirtualHost *:443>
    ServerName example.com
    SSLEngine on
    SSLCertificateFile    /etc/ssl/certs/example.crt
    SSLCertificateKeyFile /etc/ssl/private/example.key
    DocumentRoot /var/www/html
</VirtualHost>

Tomcat connector on 8443 (in server.xml):

<Connector port="8443" protocol="org.apache.coyote.http11.Http11NioProtocol"
           SSLEnabled="true" maxThreads="150" scheme="https" secure="true">
    <SSLHostConfig>
        <Certificate certificateKeystoreFile="conf/localhost.jks"
                     type="RSA" />
    </SSLHostConfig>
</Connector>

Common HTTPS Port Problems and Fixes

Symptom → cause → fix. That's the fastest way to debug this stuff.

  • Page times out: Port 443 blocked by a firewall or cloud security group. Open the inbound rule (and check both ufw/firewalld and your provider's security group).
  • "Connection refused": No service listening on 443. Confirm your web server started and is bound to the right port.
  • Certificate warning: Expired or mismatched cert. Renew it; automate renewal so this stops happening.
  • "Not secure" / mixed content: Your HTTPS page loads images or scripts over http://. Switch all asset URLs to https:// or protocol-relative paths.
  • Redirect loop: Usually a misconfigured proxy forwarding HTTP to HTTPS to HTTP again. Check your reverse proxy and the X-Forwarded-Proto header handling.
Flowchart infographic for fixing HTTPS on port 443 with firewall, DNS, cert, service, and mixed content checks
Flowchart infographic for fixing HTTPS on port 443 with firewall, DNS, cert, service, and mixed content checks

Security Best Practices for Port 443

Exposing 443 to the internet means it'll get scanned constantly. Lock it down properly:

  • Use TLS 1.2 and 1.3 only — drop the old, broken protocols.
  • Disable weak cipher suites.
  • Enable HSTS — but carefully, since it's hard to undo once browsers cache it.
  • Automate certificate renewal so nothing expires silently.
  • Watch your logs and run periodic scans.

Why HTTPS Matters for Security and SEO

HTTPS encrypts data in transit, keeps cookies secure, and stops browsers from slapping a "Not secure" label on your site. That label alone scares off visitors. If you are a website owner, switching to HTTPS gains users' trust — even if your clients don't know the difference between HTTP and HTTPS, the padlock icon or the security warning browsers use can make them leave your website for good.

On the SEO side, HTTPS is a confirmed Google ranking signal. Google officially announced that using the HTTPS protocol will improve sites' rank on the SERP. Currently, more than 94% of websites use HTTPS, which leaves you almost no chance to compete in ranking using an insecure protocol. Furthermore, running an eCommerce website is impossible without an SSL or TLS certificate — PCI DSS requires all websites using online payment services to run on the HTTPS protocol. HTTPS also preserves referral data that HTTP-to-HTTPS jumps would otherwise strip. Pair it with solid VPS hosting and you've got a clean, trusted setup.

Conclusion

The HTTPS protocol provides a secure network between a web browser and a web server to communicate and transfer data. It uses SSL/TLS certificates to encrypt users' sensitive data. We've covered everything you need to know about the default HTTPS port number and why it's important for data transmission. Port 443 is the standard, port 8443 is the most common alternative, and HTTPS will run on any port you configure — but for public websites, stick with 443.

On the contrary, the HTTP protocol transfers data in plain text and exposes data to anyone accessing the channel. That's why you should ensure the site you use runs over HTTPS ports like 443 or 8443 before sharing your information, credit card details, or other online credentials.

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Category: Technology

FAQs About What Is HTTPS Port 443? 🔒 Port 80 vs 443 Explained

HTTPS on port 443 uses TCP (Transfer Control Protocol). UDP (User Datagram Protocol) is not typically used for HTTPS; TCP is the standard protocol for reliable and secure data transmission in HTTPS connections.

The default HTTPS port is 443. Browsers assume this port automatically when you type a URL beginning with https://, which is why you rarely see it written out in an address.

Port 443 is the standard port HTTPS uses, but they aren't identical. HTTPS is the encrypted protocol; 443 is just the default network port that protocol listens on by convention.

No. Port 8443 is a common alternative HTTPS port, often used by Apache Tomcat, admin panels, and app servers. The actual default for HTTPS is 443.

Port 80 carries unencrypted HTTP traffic, so data travels in plain text. Port 443 carries HTTPS, where traffic is encrypted with TLS. Port 443 is the secure choice for any modern website.

Yes. HTTPS works on any port you configure for it, such as 8443 or 9000. Non-standard ports must be typed explicitly in the URL, for example https://example.com:8443, since browsers only assume 443.

Traditional HTTPS uses TCP on port 443. Modern HTTP/3 uses QUIC, which runs over UDP, also on port 443. So both are possible depending on the protocol version negotiated.

No. Opening the firewall port is only one step. You also need a web server listening on 443, a valid SSL/TLS certificate, correct DNS, and proper server configuration before HTTPS actually works.

Yes. HTTPS requires a valid SSL/TLS certificate to establish an encrypted session. Without one, browsers will refuse the connection or show a certificate error, even if port 443 is open.

Port 8080 is a common alternative HTTP port, used for proxies, development servers, and application containers. It carries unencrypted traffic, unlike 8443 which is used for HTTPS.

Usually an expired certificate, a hostname mismatch, an untrusted certificate authority, or an incomplete certificate chain. Renewing the certificate and verifying it matches your domain fixes most of these errors.

Susith Nonis

Susith Nonis

I'm fascinated by the IT world and how the 1's and 0's work. While I venture into the world of Technology, I try to share what I know in the simplest way with you. Not a fan of coffee, a travel addict, and a self-accredited 'master chef'.

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Lavern Reichert

2024, Dec, 24

This post does an excellent job of breaking down the complexities of the HTTPS protocol and why it's such an integral part of online security. It's important for anyone with a website to understand why using HTTPS can protect user data and build trust with visitors. Plus, the handy tips on enabling Ports 443 and 8443 across different operating systems offer a practical guide to securing online interactions. As privacy concerns grow, it's vital to stay informed about these protocols, so this article is incredibly timely and valuable. Well done!