IT - Network System Administrator & Hacking

How to Change Your Wi Fi Password

Wi Fi is great for connected internet and convenient moving. But a poorly secured Wi Fi can put your personal information at risk. Sometime, you should change your wi fi password to protecting your network and your data. Moreover, it’s also keeps cheap neighbors from stealing your bandwidth! Making increase your network speed.

change your wi fi password follow steps below :

Step 1. Open your browser as chrome, firefox, safari, IE … and type route’s address

Standard router addresses are : 192.168.1.1, 192.168.0.1, 192.168.2.1 or 10.0.1.1 or 10.0.0.1

route's address

Note: If none of the above addresses grant you access to the configuration page:,

Windows key + R and entering cmd à type ipconfig à press Enter à look for Default Gateway this is router’s gateway.

look for Default Gateway

Step 2: Enter username / password

Note : if you don’t remember router’s username/ password maybe it’s default :

MODEM	DEFAULT USER NAME	DEFAULT PASSWORD
Arris DG1670A	admin	password
Arris DG860A	admin	password
Arris TG1672G	admin	password
Arris TG852G	admin	password
Arris TG862G	admin	password
Technicolor/Thomson/RCA TCM8715D	admin	password
Technicolor/Thomson/RCA TC8717T	admin	password
Technicolor/Thomson/RCA DWG875A	No user name required	admin
Ubee/Ambit DDW3611	user	user
Ubee/Ambit DDW365	user	user
Ubee/Ambit DDW36C	admin	see device label*
Ubee/Ambit DVW3201B	user	user
Ubee/Ambit DVW32CB	admin	see device label*

*A random password can be found on the device label

Step 3 : Open wireless section :

The exact name changes from manufacturer to manufacturer, but generally you are looking for a "Wireless" or "Wireless Settings/Setup" tab or button.

Step 4 : Change the password.

Look for the box labeled "Password", "Passphrase" or "Shared Key". You can enter your new password into this box. Some routers will ask that you type the password again to ensure that you entered it correctly.

change your wi fi password

Note : Try to create a strong password that would be difficult if not impossible to guess and at least 8 characters long

Step 5: Check security type

Note : recommend using WPA/ WPA2

Then click SAVE SETTING button

Good luck !

How to "undo" ( Ctrl + Z ) on windows

Undo ( Ctr + Z) on windows to comeback previous state on your OS

Sometime, use using mouse crazy so, use have accidentally moving folders or file to other one. The administrator can restrict this isue by change regeiter to UNDO action :

Press : Windows key + R --> type regedit --> press Enter --> then look for tree and change value

Confirmation prompt:
Locally:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersio
n\Internet Settings\Zones\0]

"1802"=dword:00000001

Intranet:
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersio
n\Internet Settings\Zones\1]

"1802"=dword:00000001

I tested and it's work file

Create Kakaotalk Account on PC

Create Kakaotalk Account on PC

Step1: Access to https://accounts.kakao.com/weblogin/create_account?continue=http://www.kakao.com/main

Step2: Agree and Continue

Step3: fill with your email and password then click “Next”

Step4: confirm your email, click “Confirm”

Step5 : “Verify now” email

Đây là thông báo đã gửi mail cho bạn.

Step6: You will received this format email from Kakao team

Step 7: inform Successful

How to Remotely Turn On Your PC Over the Internet

If you use remote desktop, remote file access, or other server software, you may leave your computer on at home or work when you leave the house. This uses more power. Instead, you could simply remotely power on your PC whenever you need to use it.

This takes advantage of Wake-on-LAN. In spite of its name, it’s possible to set up Wake-on-LAN so that you can send “magic packets” that will wake a computer up over the Internet.

Set Up Wake-On-LAN

To make this work, you’ll first have to set up Wake-On-LAN normally. You’ll typically find this setting in a computer’s BIOS. Enter the BIOS and ensure the Wake-On-LAN option is enabled.

If you don’t see this option in your BIOS, check the computer or motherboard’s manual to see if it supports Wake-on-LAN. The computer may not support Wake-on-LAN or WoL may always be enabled with no related options in the BIOS.

The Port-Forwarding Method

Wake-On-LAN uses UDP. Many utilities use ports 7 or 9, but you can use any port you like for this. You’ll need to forward a UDP port to all IP addresses behind your router — you can’t just forward to a specific IP address. The Wake-on-LAN packet must be forwarded to every device running behind your router, and a device will only wake up if the information in the WoL packet matches it. This is known as a “subnet directed broadcast.”

To do this, you’ll need to forward the port to the “broadcast address,” which will broadcast the packet to all computers on a network. The broadcast address is 192.168.*.255. For example, if your PC has the IP address 192.168.1.123, you’d enter 192.168.1.255 as the broadcast address. If your PC has the IP address 192.168.0.123, you’d enter 192.168.0.255 as the broadcast address.

Choose a tool for sending magic packet

Next, choose a tool for sending that magic packet. There are many, many different options for sending Wake-On-LAN packets. We previously recommended depicus, whose website offers a variety of free Wake-On-LAN utilities for any platform you might want. For example, you could use the graphical Wake on LAN Windows program, a web interface that allows you to send a packet from your browser, or an Android app. Free Wake-on-LAN utilities are available for every platform you might want one for — here’s one for iPhone.

When using any of these tools, you’ll need to enter four bits of information:

MAC Address: Enter the MAC address of the network interface listening for the Wake-On-LAN packet.
IP Address or Domain Name: Enter your router’s IP address on the Internet or a dynamic DNS address like you.ddns.com.
Subnet Mask: You’ll also have to enter the appropriate subnet mask for the computer behind the router.
Port Number: Enter the number of the UDP port you forwarded to the broadcast address .

The tool can then send a “magic packet” with the correct information and — if you’ve configured everything correctly — your PC will wake up.

Put together this post and sleep tool that is perfect skill

Collect from website

How to sleep windows 7

Sometime we can't to sleep Windows via remote desktop or you would like to crate schudule to sleep windows 7.

It's simple to do this :

Download WIZMO
Copy wizmo.exe to C:\Windows\System
Create shortcut like this :
Run shortcut (Finished)

You can create schedule to run this shortcut. Enjoin !!!

Repair Logictech's wireless and bluetooth mouse

How to repair or re-use Logictech's wireless and bluetooth mouse if you loss USB adapter reception

Với chuột Logitech khi các bạn làm mất đầu thu USB thì có thể kiếm 1 cái đầu thu khác sử dụng cùng công nghệ với đầu thu đã mất và thực hiện như sau:

Nếu là đầu thu có unifying thì tải cái phần mềm Setpoint về.
Nếu là đầu thu bình thường thì tải cái Connect Utility

Cắm cái đầu thu vào máy tính, Bật phần mềm vừa tải về xong lên, tắt bật lại công tắc trên con chuột, Ấn vào nút Next vừa hiện lên, di di con chuột, thấy có chạy thì ấn Finish.

Good luck for you

Apache is one of the most widely used and popular web servers in the world, so it is important to protect your website and users from Brute-force attacks. Fail2ban is an open-source intrusion prevention software written in Python. Fail2Ban continuously analyzes various services’ log files (like Apache, ssh, postfix …), and if it detects malicious attacks, then it creates rules on the firewall to block hackers IP addresses for a specified amount of time. Fail2Ban also informs a system admin with an email of its activity.

In this article I will explain how to install fail2ban and configure it to monitor your Apache logs for malicious authentication failure attempts.

Requirements

Ubuntu server 14.04 with Apache installed
Apache configured with password authentication

Installing Fail2Ban

First, make sure the Apache server is running and password authentication is enabled.

Next, you can install Fail2ban by running:

sudo apt-get update
sudo apt-get install fail2ban

Configure fail2ban for Apache

The fail2ban keeps its configuration file “jail.conf” in the “/etc/fail2ban/” directory. It contains a set of pre-defined filters for various services, and it is recommended that you not edit this file. You need to enable predefined Apache jails by creating a “/etc/fail2ban/jail.local” file:

To create new “jail.local” file, run:

sudo nano /etc/fail2ban/jail.local

Add the following content:

[apache]
enabled  = true
port     = http,https
filter   = apache-auth
logpath  = /var/log/apache2/*error.log
maxretry = 3
findtime = 600
ignoreip = 192.168.1.227
 
[apache-noscript]
enabled  = true
port     = http,https
filter   = apache-noscript
logpath  = /var/log/apache2/*error.log
maxretry = 3
findtime = 600
ignoreip = 192.168.1.227
 
[apache-overflows]
enabled  = true
port     = http,https
filter   = apache-overflows
logpath  = /var/log/apache2/*error.log
maxretry = 2
findtime = 600
ignoreip = 192.168.1.227
 
[apache-badbots]
enabled  = true
port     = http,https
filter   = apache-badbots
logpath  = /var/log/apache2/*error.log
maxretry = 2
findtime = 600
ignoreip = 192.168.1.227

Save and close the file, then restart fail2ban for the changes to take effect.

sudo /etc/init.d/fail2ban restart

You can verify the rules that were added by Fail2Ban in iptables using the following command:

sudo iptables -L

The output will look something like this:

Note : You can find the details of each jail described below:

[apache] : this jail is used to block failed login attempts.
[apache-noscript] : this jail is used to block remote clients who are searching for scripts on the website to execute.
[apache-overflows] : this jail is used to block clients who are attempting to request suspicious URLs.
[apache-noscript] : this jail is used to block remote clients who are searching for scripts on website to execute.
[apache-badbots] : this jail is used to block malicious bot requests.

Note : You can find the details of each rule described below.

enabled : this option means Apache protection is on.
port : this option specifies the services that fail2ban monitors.
filter : this option refers the config file located in the /etc/fail2ban/filter.d/ directory.
logpath : this option specifies the location of log file.
bantime : this option specifies the number of seconds that a remote host will be blocked from the server.
maxretry : this option specifies the number of failed login attempts before a remote host is blocked for the length of the ban time.
ignoreip : this option allows you to whitelist certain IP addresses from blocking.

Check Fail2ban Banning Status

Once jails are activated, you can check fail2ban using the fail2ban-clientcommand:

sudo fail2ban-client status

You can see a list of all of the jails you enabled.

To see the status of a particular jail like apache, apache-badbots by running the following commands:

sudo fail2ban-client status apache

The output looks like this:

You can also manually set ban or unban IP addresses.

For example, to ban an IP address (192.168.1.20) with an apache jail:

sudo fail2ban-client set apache banip 192.168.1.20

To unban an IP address (192.168.1.21) with an apache jail:

sudo fail2ban-client set apache unbanip 192.168.1.21

Testing Fail2Ban

It is important to test your fail2ban whether it is working as expected or not. Now on a remote machine, open your web browser and type the URL of your domain (or your server’s IP address). When Apache prompts for authentication, give an incorrect user name and password repeatedly. After you have reached the limit you should be blocked and unable to access the site.

Check the status with the fail2ban-client command:

sudo fail2ban-client status apache

You will see your IP address being blocked from the site.

Conclusion

Now, you have enough knowledge to configure fail2ban. Using fail2ban is a good and easy way to stop flooding (Brute-force attacks). It is also a good way to limit the number of bad requests you receive on your Apache webserver.