Communication Ports & GRC's Shields Up program

beingbobbyorr

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So, when I run Gibson Research's http://www.grc.com/ "Shields Up!!" program, I get lots of green and blue ports, and one red port . . . .





. . . . with the following details:






I assume we’re really supposed to have mostly (if not all) green cells here.

How can I turn a red cell into a blue cell?
How can I turn a blue cell into a green cell?
 

beingbobbyorr

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I've tried that, but it doesn't seem to work. When I edit the post, there is no "small photograph with a tree in it". Instead there is an "Add Picture" icon that looks like a computer monitor. Clicking it gives me a simple dialog box that asks for a URL. So I give it one (E:\_________todo_01________in__development\____kaspersky_4__GRC\kaspersky_grc.jpg), and clicking Ok puts that text in between
in the text box where my mouse cursor is. . . . . . but then I update the thread and the desired picture does not appear.

Can you try the Google Photo URL again? I shall remain logged in to this Google account, which seems to be necessary for those URLs to work (even from my end, which is strange, because I would hope they are visible to all regardless of whether I'm logged in or not).
 

beingbobbyorr

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Images are up on https://imgur.com/
Hopefully this works.
 

beingbobbyorr

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Pretty sure I got it now.
 

Ralston18

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Red is an open port and the red is meant as a warning/caution - your system is vulnerable through that open port.

Green is a closed port and the green is meant as a sign of safety/security. (No Guarantees....)

Blue is a port that will not respond to incoming pings/packet by replying if it is open or closed. However, google "what is a stealth port". Topic is somewhat more involved and you probably should do some additional reading. "Stealth" is subject to varying levels of interpretation....

Overall all most ports should be closed but stealth is okay if that is truly in place as a viable function.

The only ports that should be open are the ports commonly used by systems for networking, specific applications, and specific purposes. I.e., you know/understand the purpose of the port and determine if and when you wish that port to be open for use.

Those are ports that you will want to have open via your router and its' port forwarding functions.

There are any number of online listings regarding port numbers and how they are assigned. For example:

https://www.lifewire.com/popular-tcp-and-udp-port-numbers-817985

Here is a link with much more information:

https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

Easy to find other similar lists with additional explanations and details.

So if you have a game on your computer and that game requires a specific port or ports you must set up your router accordingly.

Incoming game data is examined and the required port number is noted. The router looks at its configuration tables and finds that data for that port number is to go to a specific computer via the computer's MAC. In the configuration tables the MAC is found along with the corresponding Static IP assigned to the destination computer. And the router forwards the packer to the computer and destination port accordingly.

You may have to allow passage through firewalls or other security measures as well...

Sort of an overview and there are far more detailed explanations available online.

But to specifically address opening and closing ports start with the following links:

http://www.tomshardware.com/news/how-to-open-firewall-ports-in-windows-10,36451.html

https://www.windowscentral.com/how-open-port-windows-firewall

Read first, make a plan, and then start with just one port, open it, close it, and otherwise learn how to control its' status.

Keep some notes in case you need an "undo".

Once you understand the process and have control then open and close ports (or stealth them if you will) as desired.
 

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