There are archives of podcasts-{other formats available} -
https://www.grc.com/securitynow.htm
you can test your ports /shields -Welcome to ShieldsUP!-
https://www.grc.com/x/ne.dll?bh0bkyd2


[Our Growing Collection of High-Quality, Super-Small and
Super-Fast, Freely Downloadable Programs & Resources]
https://www.grc.com/freeupdated.htm

Just ran some of these again and this is my result for -
File Sharing -
[ Shields UP! is now attempting to contact the Hidden Internet Server within your PC. It is likely that no one has told you that your own personal computer may now be functioning as an Internet Server with neither your knowledge nor your permission. And that it may be serving up all or many of your personal files for reading, writing, modification and even deletion by anyone, anywhere, on the Internet!

Your Internet port 139 does not appear to exist!
One or more ports on this system are operating in FULL STEALTH MODE! Standard Internet behavior requires port connection attempts to be answered with a success or refusal response. Therefore, only an attempt to connect to a nonexistent computer results in no response of either kind. But YOUR computer has DELIBERATELY CHOSEN NOT TO RESPOND (that's very cool!) which represents advanced computer and port stealthing capabilities. A machine configured in this fashion is well hardened to Internet NetBIOS attack and intrusion.
Unable to connect with NetBIOS to your computer.
All attempts to get any information from your computer have FAILED. (This is very uncommon for a Windows networking-based PC.) Relative to vulnerabilities from Windows networking, this computer appears to be VERY SECURE since it is NOT exposing ANY of its internal NetBIOS networking protocol over the Internet.]

all ports -
[GRC Port Authority Report created on UTC: 2009-01-16 at 22:34:34

Results from scan of ports: 0-1055

0 Ports Open
0 Ports Closed
1056 Ports Stealth
---------------------
1056 Ports Tested

ALL PORTS tested were found to be: STEALTH.

TruStealth: FAILED - ALL tested ports were STEALTH,
- NO unsolicited packets were received,
- A PING REPLY (ICMP Echo) WAS RECEIVED.]

the test buttons are in the gray bar that goes across the screen -
a bit hard to find unless you know what it is...

I just tested. I"m a Stealth Monkey.

Very cool tool.