I had to test something out where I needed to make sure the right ports were not being blocked by the windows firewall.  In this example, I use port 8080. I used powershell to forcefully open any outbound and inbound ports.  Outbound is usually open by default, but I wanted to double ensure it.

New-NetFirewallRule -DisplayName "Allow outbound TCP port 25" -Direction outbound -LocalPort 8080 -Protocol TCP -Action Allow

New-NetFirewallRule -DisplayName "Allow INBOUND TCP port 25" -Direction inbound -LocalPort 8080 -Protocol TCP -Action Allow

New-NetFirewallRule -DisplayName "Block Outbound Port 80" -Direction Outbound -LocalPort 80 -Protocol TCP -Action Block

Test it out – Use tcp.connect to see if you can get to the server on the port

$tcp = New-Object System.Net.Sockets.TcpClient

$tcp.Connect($myserver,"8080")

$tcp.Connected

You may need this if you are trying to use an SSL/TLS connection to test out your script/program

System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12;

You can also use Test-NetConnection

Test-NetConnection -ComputerName www.contoso.com –Port 8080

Anuj holds professional certifications in Google Cloud, AWS as well as certifications in Docker and App Performance Tools such as New Relic. He specializes in Cloud Security, Data Encryption and Container Technologies.

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