How to Check if Port 443 is Open (Using CMD & PowerShell — No Telnet or Netcat)

 If you want to check whether port 443 (HTTPS) is open without using Telnet or Netcat, Windows already provides powerful built-in tools in Command Prompt (CMD) and PowerShell.

This guide focuses only on native Windows methods 👇

🧾 Method 1: Using PowerShell (Recommended ✅)

PowerShell provides the most reliable and readable way to test ports.

🔹 Command:

Test-NetConnection yourdomain.com -Port 443

🔍 Example:

Test-NetConnection google.com -Port 443

✅ Output Meaning:

Look for this line:

TcpTestSucceeded : True

• True → ✅ Port is OPEN
• False → ❌ Port is CLOSED or BLOCKED

💡 Bonus (Cleaner Output):

Test-NetConnection google.com -Port 443 | Select-Object -Property ComputerName,RemotePort,TcpTestSucceeded

🧾 Method 2: Using CMD (with PowerShell inside CMD)

Even in Command Prompt, you can run PowerShell commands directly.

🔹 Command:

powershell -Command "Test-NetConnection google.com -Port 443"

👉 This works the same as PowerShell and is useful if you're working inside CMD.

🧾 Method 3: Using curl in CMD (Windows 10+)

Windows now includes curl by default.

🔹 Command:

curl -v https://google.com

🔍 What to Look For:

• If connection succeeds → ✅ Port 443 is OPEN
• If you see errors like:
• Connection refused
• Failed to connect

→ ❌ Port is CLOSED or BLOCKED

🧾 Method 4: Check Local Port (Is Your Server Listening?)

If you're running a service locally and want to verify if port 443 is active:

🔹 CMD Command:

netstat -an | find ":443"

🔍 Output Example:

TCP 0.0.0.0:443 0.0.0.0:0 LISTENING

👉 Meaning:

• LISTENING → ✅ Port is open on your machine
• No result → ❌ Nothing is using port 443

🧾 Method 5: Using PowerShell (Advanced Check)

🔹 Command:

Get-NetTCPConnection -LocalPort 443

👉 If results appear → Port is active

👉 If empty → Port not in use

🚫 Common Issues If Port is Closed

• Firewall blocking traffic
• IIS / Apache / Nginx not running
• Wrong IP or domain
• Cloud security rules (AWS, Azure, etc.)

🎯 Conclusion

You don’t need Telnet or Netcat to check ports on Windows. Using:

• ✅ Test-NetConnection (Best option)
• ✅ curl
• ✅ netstat

…you can quickly verify whether port 443 is open locally or remotely.