If you're running a VPS and find that a specific port (such as 80, 443, 3389, or a custom application port) is blocked, it's likely being filtered by Windows Defender Firewall. This can prevent applications from listening for incoming connections — such as websites, custom RDP ports, or trading software.
Step-by-Step: Open a Port in Windows Firewall
Step #1: Open Windows Defender Firewall
Click the Start Menu
Search for: Windows Defender Firewall with Advanced Security
Open the app
Step #2: Create a New Inbound Rule
In the left-hand menu, click Inbound Rules
On the right-hand side, click New Rule…
Step #3: Choose Port-Based Rule
Select Port
Click Next
Step #4: Select Protocol and Enter Port Number
Choose either TCP or UDP (most services use TCP)
In the "Specific local ports" box, enter the port number you want to allow (e.g.,
80for HTTP,443for HTTPS, or your app's port)Click Next
Step #5: Allow the Connection
Select: Allow the connection
Click Next
Step #6: Apply to Network Profiles
You can apply the rule to:
Domain
Private
Public
In most VPS environments, we recommend checking all three. Click Next.
Security note: Enabling a rule on the Public profile increases your VPS's exposure to the internet on that port. Only include it if this VPS genuinely needs to be reachable while its network connection is classified as Public — otherwise, prefer applying the rule to just the Private and/or Domain profiles.
Step #7: Name the Rule
Enter a name that describes the rule (e.g., "Allow Port 80" or "Custom App Port 5000")
Click Finish
The rule will now appear in your list of active inbound rules.
Port Is Now Open
Once added, your application or service should be accessible on that port (assuming the application itself is running and listening on that port). You can use tools like netstat, telnet, or online port checkers to verify the open state.
Need Assistance?
Our support team is available 24/7. If you have any questions or run into issues, open a support ticket from your QuantVPS dashboard and we'll get back to you as quickly as possible.