Answer:A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users.

You can always use netstat command to get list of connections under Windows. Open command prompt by visiting Start > Run > Type “cmd” in box.

netstat is a command line utility which displays protocol statistics and current TCP/IP network connections in a system. Type the following command to see all connections:
netstat -noa
Where,

1. n: Displays active TCP connections, however, addresses and port numbers are expressed numerically and no attempt is made to determine names.
2. o: Displays active TCP connections and includes the process ID (PID) for each connection. You can find the application based on the PID on the Processes tab in Windows Task Manager.
3. a: Displays all active TCP connections and the TCP and UDP ports on which the computer is listening.

You can use find command as filter to searches for a specific string of text in a file. In the following example you are filtering out port 80 traffic:
netstat -ano | find /c "80"
Find the IP address which is having maximum number of connection and block it using Cisco firewall or IPSec. Another protective measurement is to harden the TCP/IP stack.

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1. Insert and boot from your WindowsXP CD.
2. At the first R=Repair option, press the R key
3. Press the number that corresponds to the correct location for the installation of Windows you want to repair.
   Typically this will be #1
4. Enter in the administrator password when requested
5. cd \windows\system32\config
6. Depending on which section was corrupted:
   ren software software.bad or ren system system.bad
7. Depending on which section was corrupted
   copy \windows\repair\system
   copy \windows\repair\software
8. Take out the CD ROM and type exit

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1. Install VMware Tools

To start, VMware Tools needs to be installed in your Virtual Machine. That should at least be from vSphere version 4.0.

2. Update your Graphics Drivers

Go to your Hardware Manager in Windows and right click your Display Adapter. Choose Update Driver Software.

Say you’ll browse to a specific location and point it to C:\Program Files\Common Files\VMware\Drivers\wddm_video.

Et voila: your driver has been updated!

3. Reboot your VM

After the driver’s been installed, reboot your Virtual Machine and you will notice the smooth console access you’re used to from Windows Server 2003.

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    Error: “The network location cannot be reached. “

The most likely cause is that Host Headers for that particular site are configured for an IP address which is either no longer configured on the server, or on which IIS is no longer listening. I’m just going to assume you know how to check if an IP is configured on a server.

To check whether IIS service is listening on a particular IP, you’ll need the Windows Server Support Tools (hit google for another version if you should need it). After the installation, can you use the following Command Prompt tools.

> httpcfg query iplisten
IP                      : 10.1.5.200

If your IP address isn’t present, try adding it.

> httpcfg set iplisten -i 10.1.5.201
HttpSetServiceConfiguration completed with 0.

And query the list again.

> httpcfg query iplisten
IP                      : 10.1.5.200
------------------------------------------------------------------------------
IP                      : 10.1.5.201
------------------------------------------------------------------------------

If it does not work after the httpcfg change, you may have to reboot your server (I know, it sucks). For some reason, restarting IIS alone may not always help.

A very likely cause is that something else was occupying port 80 already when the IIS service started, causing it to delete that particular listen IP from it’s configuration. To track that down, use netstat.

> netstat -anb | find “80″

That will list all connections or programs listening to port 80.

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smbclient -M <WINDOW-SYSTEM-NAME> <<EOF
Message
Message
…
..
…
When the message is complete, press Control-D.

Send message to Windows system from Linux/ FreeBSD

To send a message “Meeting canceled” to windows system called joyxp
$ smbclient -M joyxp <<EOF
Output:

Meeting canceled
See you at coffee house in 2 hrs.
--Vivek
EOF

With –U you can specify the username.
$ smbclient -M myxp -U VIVEK <<EOF
Meeting cancelled
See you at coffee house in 2 hrs.
EOF

This tip also works with Linux and other UNIX variant with Samba client utilities package. Read man page of smbclient for more information.
man smbclient

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Use the mount command to mount remote windows partition or windows share under Linux as follows:

Procedure to mount remote windows partition (NAS share)

1) Make sure you have following information:
==> Windows username and password to access share name
==> Sharename (such as //server/share) or IP address
==> root level access on Linux

2) Login to Linux as a root user (or use su command)

3) Create the required mount point:

# mkdir -p /mnt/ntserver

4) Use the mount command as follows:

# mount -t cifs //ntserver/download -o username=vivek,password=myPassword /mnt/ntserver

Use following command if you are using Old version such as RHEL <=4 or Debian <= 3:

# mount -t smbfs -o username=vivek,password=D1W4x9sw //ntserver/download /mnt/ntserver

5) Access Windows 2003/2000/NT share using cd and ls command:

# cd /mnt/ntserver; ls -l

Where,

• -t smbfs : File system type to be mount (outdated, use cifs)
• -t cifs : File system type to be mount
• -o : are options passed to mount command, in this example I had passed two options. First argument is password (vivek) and second argument is password to connect remote windows box
• //ntserver/download : Windows 2000/NT share name
• /mnt/ntserver Linux mount point (to access share after mounting)

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To perform this format successfully, you need to launch Command Prompt with Administrator permissions before executing the command.

Here are the steps to follow:

1. First, find the drive letter of the HDD you wish to format from My Computer. Check, double check, and triple check you have the right letter before executing any format commands on your drive.

2. Navigate to the Command Prompt program: Start Menu > Accessories

3. Right click the Command Prompt entry in Accessories and choose to “Run as Administrator”.

4. You should be prompted by User Account Control “Do you want to allow the following program to make changes to this computer?” Answer yes. If you have disabled UAC, you will not see this message.

5. With the command prompt now showing, enter the following command:

format XYZ: /FS:FAT32

Replace XYZ with the letter of the drive you wish to format.

You can also perform a quick format on any drive without bad sectors:

format XYZ: /FS:FAT32 /q

Again, replace XYZ with the letter of the drive you want to format.

Depending on the size and the method you choose to use to format your drive, it can take anywhere between one minute and several hours for the format to finish. But once complete, you will have your drive properly formatted to the FAT32 filesystem.

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To change this setting:

1. Run gpedit.msc
2. Go to Computer Configuration / Windows Settings / Security Settings / Local Policies / Security Options
3. Double click on Accounts: Limit local account use of blank passwords to console login only
4. Disable this option

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In SQL Server Management Studio navigate to your database.

Right click it and select “Tasks” -> “Generate Scripts”
“Next”
Select your database from the list
“Next” Select “Stored Procedures” “Next”
“Select All” “Next”
“Script to new Query Window” “Next”
“Finish”

Give it a while. Then when complete, at the very top of the script put “use (yourdatabase)”

Execute the use statement.
Execute the whole script.

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