IP | localhost, loopback address – What is Hey! Before starting our article on IP address; I would like to inform my audience that there is a very famous saying i.e. “There is no place like What this means is; is the localhost ip address, if you want to do something with your system code. It is a home, no matter what you do next you will get back to this address. So there is no place like home. IP

You must now be knowing what exactly is. In our article, we’ll be discussing localhost, its importance, and much more!

WHAT IS Meaning: is the loopback Internet protocol (IP) address also referred to as the “localhost.” http // is the address of the localhost address is used to establish an IP connection to the same machine or computer being used by the end-user.

http // localhost: This is known as a loopback address / localhost IP. Every computer uses this IP but it doesn’t let you communicate with some other devices unlike and other real IP addresses. To understand the difference, for example, is a local IP address, with this your computer and router can communicate with each other and exchange information. However, IP is specifically assigned to the machine you’re reading this on and can’t be used to communicate with devices even on a local area network. A web server running on a computer can point to so that the pages can be run locally and tested before it’s deployed. VS OTHER SPECIAL IP ADDRESSES:

All the IP addresses in the range of till are reserved by IPV4 and are used in loopback testing, although, by convention and history; is the IP address that is used the maximum number of times in loopback testing.

Those studying computer networking sometimes confuse with the address While both have special meanings in IPv4, does not provide any loopback functionality.


  1. TCP/IP recognizes as a special IP address.
  2. System administrators and application developers commonly use to test applications.
  3. The protocol checks each message before sending it onto the physical network and automatically re-routes any messages with a destination of back to the receiving end of the TCP/IP stack.
  4. If any public switch, router, or gateway receives a packet addressed to the loopback IP address, it is required to drop the packet without logging the information.
  5. This prevents a network attacker from disguising their malicious network traffic as coming from a loopback address.
  6. And this is how works for loopback testing


Loopback testing is used to either determine whether a device is working fine or to prevent a failing node in a network. A loopback test is a test in which a signal is sent from a communications device and returned (looped back) to it.

Interfaces such as aggregated Ethernet, gigabit Ethernet, fast Ethernet, etc. can also be configured to execute a loopback test to verify circuit connectivity. The loopback test isolates circuit segments so that they can be tested separately. WWW.YOUTUBE.COM | WWW.FACEBOOK.COM

If you want to block YouTube or any other websites in all computer browsers then you can do it easily with the help of this particular IP Address. No matter what browser you’re using.

1. First of all, Open your Computer “hosts” File in any of the Windows or Mac Computer. Once you successfully open the “hosts” file, you’re ready to enter this IP address.

2. Now, You have a line at the bottom with YouTube’s address which includes an IP Address. Type and press the Tab ↹ key, then type in youtube.com and press ↵ Enter.

  • Note: If you use the Chrome Browser then you’ll need to place a space after YouTube’s address and then type in www.youtube.com there.

3. Similar steps for YouTube’s mobile address with just the different mobile version alphabet (m). Type in again and press the Tab ↹ key, then type in m.youtube.com and press ↵ Enter.

4. Next step is to do by saving your “hosts” files.

  • Windows — Click File, click Save As…, click Text Documents, click All Files in the drop-down menu, click the “hosts” file, click Save, and click Yes when prompted.
  • Mac — Press Control+X (not ⌘ Command+X), press Y when prompted, and press ⏎ Return.

5. Once you’ve edited the “hosts” files perfectly. The final step is needed to restart your computer to ensure that your changes have taken place.

6. You’re done with Blocking YouTube at your end. Reverse the steps for allowing YouTube to open on Browsers again.

Follow these Similar steps for Adult websites, if you want to block them all like as www.pornhub.com. It’s the simplest way to block Porn Sites & Facebook as well. Make sure to add mobile versions of the websites. Facebook.com is treated differently to m.facebook.com. Check the below video to know more about www.facebook.com & how to block Facebook, YouTube, or any other website easily.



If you are confused about the refused to connect meaning then “Connection refused means that the port you are trying to connect to is not actually open. So either you are connecting to the wrong IP address, or to the wrong port, or the server is listening on the wrong port, or is not actually running.”

One more thing,

  • err_connection_refused error code is a common annoying message that people using Google Chrome often encounter.
  • ERR_CONNECTION_REFUSED, Error code can be caused by a number of reasons as discussed in the video. It can be due to viruses, malware, firewalls, virus protection software, or uncleared Google Chrome cache.

In order to fix this “connection” error, there are a few simple steps that you could apply, such as:

  • Clear your browser cache.
  • Reset your IP address & flush the DNS cache.
  • Check proxy settings.
  • Disable your firewall.

Sometimes, one of these causes is the reason that you could not access your favorite websites.

To do so, copy and paste “chrome://settings/clearBrowserData” on the address bar of the Google Chrome browser, and press Enter.




Can’t connect to MySQL server on ‘’ (10061) (2003): The error (2003) Can’t connect to MySQL server on ‘ server ‘ (10061) indicates that the network connection has been refused. You should check that there is a MySQL server running, that it has network connections enabled, and that the network port you specified is the one configured on the server.

It’s the pretty common question usually asked by new users. And, we’re providing you with many of the answers to resolve this problem. So, Look at the points below –

1. First, they should look to the official documentation of MySQL how they can start a service under windows.

  • Install the server as a service using this command: C:> “C:\Program Files\MySQL\MySQL Server 5.5\bin\mysqld” –install

2. If you have already installed MySQL on a Windows machine make sure it is running as a service. You can do that by

  • Start –> services –> MySQL(ver) –> Right-Click –> Start

3. Some guys solve this problem like

(1) run MySQLInstanceConfig.exe

  • C:\Program Files (x86)\MySQL\MySQL Server 5.1\bin\MySQLInstanceConfig.exe

(2) Follow to the end without changing anything.

4. For Windows 10, In Windows go to task-manager >” services” and check that “MySQL” is running. If not
Right-click on it ->open services->MySQL-> startup type -> ‘Automatic’ -> apply and OKThis is for windows 10 MySql 5.7.

5. One of the simplest ways,

(Windows) If you have already installed the MySQL server

  • cd C:\Program Files\MySQL\MySQL Server X.X\bin
    mysqld --install

and still cannot connect, then the service did not start automatically. Just try

Start > Search “services”

and scroll down until you see “MySQLXX”, where the XX represents the MySQL Server version. If the Status isn’t “Started”, then

Right Click > Start





Can’t connect to MySQL server on ‘’ (61): There can be many reasons for this error, most of which are generously covered online, but in a recent case it was because MySQL was running on port 3307. We think that the port was updated in a recent MySQL server update because they’ve never had this issue with a previous MySQL server version. Here’s how to check if you have the same problem, and how to change it to port 3306 (unless you want to keep it running on port 3307).

  • 1. Make sure MySQL server is running
  • 2. Confirm MySQL server is listening on port 3307
  • 3. Confirm port setting in the property list (plist) is 3307
  • 4. Update port number from 3307 to 3306
  • 5. Start MySQL server and confirm its running on port 3306

Read here to know more about https://ryansechrest.com/2015/08/cant-connect-to-mysql-server-on-127-0-0-1-61/


Failed to connect to MySQL at with user root access denied for user ‘root’@’localhost'(using password: YES)

First, check if it’s a workbench or connection problem.

1) In your windows run ‘cmd’ to open a terminal

Try both

  • 2a) mysql -u root -p -h -P 3306
  • 2b) mysql -u root -p -h > localhost -P 3306

3) If the connection is good you will get a password prompt, to see if you can connect with the correct password.

If your connection is denied, just grant the permission

  • mysql >GRANT ALL ON [DatabaseName].* TO 'root'@'' IDENTIFIED BY '[PASSWORD]';

If your connection is accepted here, it’s like a workbench configuration problem.




I downloaded GNS3 and successfully installed the latest version (2.0.3) on my laptop that is running on Windows 7 Professional Service Pack 1 (64 bit). I got an error while trying to connect to the server “error when connecting to the GNS3 server: Cannot connect to Please check if GNS# is allowed in your antivirus and firewall. And that server version is 2.0.3.”

  • The simple fix before you check your antivirus (McAfee as for my case) and firewall software, run GNS3 as an administrator and it works perfectly.

So to fix the problem in the Windows system, just run the GNS3 as Administrator and continue your work. Now it must work correctly. If it’s not solved your GNS3 problems, just let us know and find out how to fix GNS3 errors! HOME

The IP address is a special-purpose IPv4 address called the localhost or loopback address (loopback testing address). All computers use this address as their own but it doesn’t let them communicate with other devices as a real IP address does.

For example, a web server running on a computer can point to so that the pages can be run locally and tested before it’s deployed.

Internet Protocol v6 (IPv6) implements the same concept of a loopback address as IPv4. Instead of, IPv6 represents its loopback address as simply::1 (0000:0000:0000:0000:0000:0000:0000:0001) and, unlike IPv4, does not allocate a range of addresses for this purpose.

More at https://www.lifewire.com/network-computer-special-ip-address-818385


If you want to test TCP/IP then Ping is generally used with IP Address.

Ping, ping, ping!

  • After you configure the Network software and set the IP addresses, use the ping command on the Sharing Computer to make sure all of the computers are “alive” (at least in the TCP/IP sense).

To do this, go to the Windows Start button, choose Programs, then MSDOS Prompt. When you get the C: prompt, type ping
If everything is ok, you should get the following response (or something similar):

Pinging wit

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h 32 bytes of data

  • Reply from bytes=32 time<10ms TTL=32
  • Reply from bytes=32 time<10ms TTL=32
  • Reply from bytes=32 time<10ms TTL=32
  • Reply from bytes=32 time<10ms TTL=32

This means that TCP/IP is working on the machine that you are typing on. is a special address that “loops back” to the machine you are pinging from. You can also type ping localhost and receive a similar response since localhost and mean the same thing.


Agar is A smash-hit game! Control your cell and eat other players to grow larger! Play with millions of players around the world. Here, the particular IP address is used to connect with the servers. In the below video, you’ll find the information related to Agar.io Private servers and Similar Games!


People also search for this kind of keyword on Google for different types of questions. It’s all related to the IP address.

  • lmlicenses.wip4.adobe.com
  • mongodb://
  • localhost
  • http // localhost
  • login


I guess now it is clear to you that IP Address is a very different IP address as compared to the rest of the IP addresses covered in our articles, if it is still not clear then you may comment below and we’ll try to answer your question as soon as possible.

However, just to give you a crux of the post; is a localhost IP address can say, localhost:; which is majorly used for loopback testing, unlike other IPs which are designed to exchange data with other devices on the same network.

Thank you for reading until the end.

Comment down your queries. We’ll be happy to resolve them!

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