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We are happy to announce the portable version of NetStat Agent 3.1. The portable version you can download here.

In this version you do not need to get a trial key as it was in previous versions. But it still has a nag-screen in the evaluation mode when you close the program or switch tools.

Anyway, if you would like to purchase NetStat Agent license you must know that you may use a license key in both versions - desktop and portable!

We are pleased to announce the availability of a new stable NetStat Agent version. In the version 3.1 we are focused on fixing bugs, but some new features are also added.

So what’s new in NetStat Agent 3.1:

- IP-to-country database is updated.
- Fixed critical bug when network adapter has more than 1 ip addresses or gateways.
- NetStat monitor in 3.1 can runs scripts like bat-files, not only exe-files as it was in previous version.
- A couple of small bugs are solved in graphical user interface.
- Fixed the bug with auto scrolling text in DNS Query, Ping, Tracer and Whois tools (short hostname issue).
- Fixed a bug with manifest file in Vista\Windows 7. Now the application looks more native.
- Solved the issue with UDP connections in Windows 7.
- Fixed the problem with copy\paste (only one character could be copied).

If you use Windows 7 or Vista, please note that some features (close connection, change a MAC address, etc.) cannot work without administrative privileges. So you must run NetStat Agent as an Administrator:

Right Click the Application shortcut -> Properties -> Compatibility and check “Run this program as an Administrator”

Using NetStat Agent 3.0 has help me save quite a bit of time tracking down spammer IPs that have connections made to the mail server I administer. It would be amazing if NetStat Agent could kill a single thread of a process, but I’ll take what I can get. Thanks!

JR Fisch

Question

“I have logged NetStat acitivity for a couple of days. I am analyzing the log now. I cannot find a definition of what can be recorded in the Event Column. What exactly does changed mean? What exactly does new mean? What exactly does removed mean?”

Answer

Event Columns means a log record status, for example:
1) You click on file in your browser and the browser opens a TCP connection to download file.
2) At this moment NetStat Agent (NA) found that your browser opened a new connection, so because it is a new connection, NA sets a record status as “New”.
3) But when your browser downloaded a file, it closes the opened connection and at this moment NA writes to log file that connection is closed and sets a record status as “Removed”.

A record status “Changed” means that connection state (see column “Status” in NetStat window) is changed, for example:
1) Let assume you run Skype and connected to Skype server.
2) In this case NA will find a TCP connection with status - “ESTABLISHED”.
3) Then you decide to close Skype (disconnect).
4) It means that your PC (Skype application) will send a FIN packet (a TCP signal to close connection) to a remote host (Skype server).
5) For your PC it means a changing connection status from ESTABLISHED to FIN_WAIT1.
6) So when NetStat Agent detects connection status changes it writes to log file what connection is changed and sets a record status as “Changed” to event column.

I was asked by email how to monitor only one local port, so decided to answer in blog.

Let assume that we have a HTTP server (Apache) on local port 80 and we want to monitor all HTTP connections. With installed NetStat Agent it is very easy to do.

After running NetStat you will see a lot of connections (click to see the large picture):

So we need to create a filter in “Monitor” tab to hide unwanted connections:

1. In the context menu (right click) select “Clear” to clear all fields.
2. Set the name of filter: “hide all”.
3. Set action as “Hide”.
4. Check on the box “Enabled”.
5. Press “Add” button to add a new filter.

The result you may see on the screenshot:

After adding this filter all connections are invisible. So we need another one to show only wanted connections:

1. In the context menu (right click) select “Clear” to clear all fields.
2. Set the name of filter: “show http”.
3. Set the local port: 80.
4. Check on “Select” action only.
5. Press “Add”.

See screenshot:

Now if you select “Connections” tab again, you will see only HTTP connections:

With NetStat Agent you may monitor HTTP visitors in real-time mode!