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SAM2009Flag for Canada

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How to veify if a specific ports are opened in Windows 2008 R2?

How to veify if specific ports are opened in Windows 2008 R2?

For example, I need to know if UDP ports 1812,1813,1645,1646 are opened. What can I do for that?
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When I use netsat in the server I got this. Does it mean port 1812 is opened?


C:\Users\a-ct006071>netstat -ano | find "1812"
  TCP    192.168.1.100:49158    172.28.131.181:1812    ESTABLISHED     580
  UDP    0.0.0.0:1812           *:*                                    1000
  UDP    [::ffff:192.168.1.100]:1812  *:*                                    1000



What "::ffff", "*.*" and "1000" mean?

And yes I need to test from Inside the server and outside.

- From Inside to make sure the prob is not from Windows firewall.
- From outside to make sure the prob is not from Cisco firewall or network.

Thanks
yes port 1812 is open (or was open when the connection was established)

:ffff is a IPv6 address
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ASKER

Thanks and for  "*.*" and "1000" what does it mean?
*:*  most likely any port from any IP
1000  PID (didn't you read the header line printed by netstat;-)
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ASKER

Ya but what means PID?
PID = Process ID.  
Open up the Task Manager (taskmgr.exe) and view the Processes tab to see which process that is.
You might need to choose to show that column if it's not currently visible.User generated image
It appears both of those free programs I linked to in http:#a39013234 actually get their info from netstat, then put it into a pretty GUI matrix for you, by the way.
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ASKER

Thanks a lot everybody for your help!