Installation/SetUp Archives - Manish Sanger

How to check if a port is open on a remote host?

manishsanger — Fri, 15 Dec 2017 07:50:28 +0000

To test if a port is open on a remote host or not. Our networking guys always use to tell that they opened the port, you can’t always run your code to test it.
If you are on windows then you can do telnet.
To enable the telnet on Windows 10, Click here

Open the command prompt and run the following command:

telnet 192.168.1.205 80

If it is successful, that it will enter on the screen. Run help to see the available option. Type quit to exit.

If networking guys are debugging the connection issue they always use to say give me the telnet screenshot or output, and you are on Linux or MacOSX. There are number of ways to do it on terminal via Netcat:
Netcat: Netcat (often abbreviated to nc) is a computer networking utility for reading from and writing to network connections using TCP or UDP. Netcat is designed to be a dependable back-end that can be used directly or easily driven by other programs and scripts. source wikipedia

Single Port:

nc -zv 192.168.1.205 80

Here is the output of the command:

NetCat multiple port

Multiple Ports:

nc -zv 192.168.1.205 80 8080

Here is the output of the command:

Netcat single port

Range of ports:

nc -zv 192.168.1.205 80-100

Here is the output of the command:

Netcat range of ports

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Release port on MacOSX and Linux

manishsanger — Fri, 15 Dec 2017 06:33:51 +0000

Sometimes when we start application on MacOSx or linux they don’t start, because an port is already occupied by application which terminated unexpectedly or by some other application. Developers face these kind of issue more frequently, when we run java application in our IDE eclipse or IntelliJ Idea and switch between run/debug or error in run/debug. Now we need to free the port which was occupied by an existing instance of the application or any other application, so that we can run the program again. This is a 2 step process:

1. Find applications running on a particular port

lsof -i :[port]

2. Kill application running on a port by PID we got from the previous step:

Kill -9 [PID]

Here is the screenshot:

free port on MacOSX or linux terminal

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Release port 8080 on Windows

manishsanger — Mon, 09 Feb 2015 08:59:43 +0000

Sometimes when we run java application on windows platform, it doesn’t start tomcat and says port 8080 already in use. To resolve this issue, we have to kill the process running on port 8080. Below are the few simple steps to release port 8080.

Start you command prompt as an administator:

Run the following command to get the process which is using the port 8080:

netstat -o -n -a | findstr 0.0:8080

To kill the process running on port 8080:

taskkill /F /PID

That’s it, have fun!!

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Install Java7 on Linux (Ubuntu 12.04)

manishsanger — Fri, 12 Apr 2013 10:34:58 +0000

If you are running an older version on java on your Ubuntu 12.04 environment, you must remove it before installing Java7. Do the following to remove:

$sudo apt-get purge openjdk*

If you installed java 7 earlier and having problem with java then you have to do the following to remove it:

$sudo rm /var/lib/dpkg/info/oracle-java7-installer*

$sudo apt-get purge oracle-java7-installer*

$sudo rm /etc/apt/sources.list.d/*java*

$sudo apt-get update

Installing Oracle Java7 on Ubuntu 12.04 LTS:

$sudo add-apt-repository ppa:webupd8team/java

$sudo apt-get update

$sudo apt-get install oracle-java7-installer

You will be prompted couple of times for permissions and Oracle Policy agreement [You must be agreed to Oracle policies to install Java :-)].

That’s it! Now you have Oracle Java7 installed on your Ubuntu 12.04 environment, to check the Java version run the following on terminal:

$java -version

java version "1.7.0_17"

Java(TM) SE Runtime Environment (build 1.7.0_17-b02)

Java HotSpot(TM) 64-Bit Server VM (build 23.7-b01, mixed mode)

Or You can check the java version by searching java in Ubuntu dashboard.

Oracle Java 7 plugin Control Panel -> General Tab -> About

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