Dos Serial Port Commands How To Protect And

Ive never been a big fan of command line tools, but occasionally some, such as Netstat, do come into their own.

The fact you dont have to install and run a separate diagnostic tool can be a life saver when dealing with a clients PC or a quarantined machine.

So if you need to know what connections a machine has to the internet and what services may be open and running, Netstat can quickly tell you.

A typical (truncated) result from Netstat -an looks like this.

The second column is the machines local IP address and port number, while the third is the remote or foreign address and port number.

ESTABLISHED means theres an actual connection between your machine and the remote IP and port that is able to exchange traffic.

Occasionally, youll see CLOSEWAIT in this column, which is a state TCP goes into while ending an established connection.

If the IP address in this column is your local network IP, then the port is only listening for connections from your local network.

Although Netstat only takes a snapshot, you can use the interval option to refresh the output every so many seconds.

You can then find the program associated with a PID by typing tasklist at the Netstat command prompt.

You can also use netstats -b flag, which outputs the EXE and its associated DLLs that are using the TCP and UDP ports.

Finally, if you want to know when another system, such as a bot controller, connects to a machine listening on a particular TCP port, such as port 4444, you can run.

You may also be interested in Microsofts Sysinternals Process Monitor tool, an advanced monitoring utility for Windows that shows real-time file system, Registry and processthread activity.

He co-authored the book IIS Security and has written numerous technical articles for leading IT publications.

Dos Serial Port Commands How To Protect And

In this guide we will explore some of the key themes driving enterprise network security initiatives, from how to protect and monitor day-to-day activity on the network, to tips on how to defend it from malicious external attackers.

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And these new systems are easier for admins to maintain and.