How to check if port is open in server?

Normally application opens a port in a server or pc for specific purpose. we can check if the port is open or not from local pc by using telnet command.

1. go to command prompt.
2. type "telnet 10.18.55.33 2312" and enter.

where 10.18.55.33 is ip address of computer for which you want to check port and 2312 is port number.
if the above command is successful and it will bring you a prompt to type telnet command and this confirms port is open. you can quit the prompt by pressing ctrl+} and type quit and press enter button.

How to make USB bootable with various windows version

There are various free tools available online to serve the perpose and we can also do it manually by copying boot info files to usb stick and then copying entire operating system files to it. here is listed how we can use various tools to do the task.

A FEW THINGS YOU NEED TO CONSIDER IN ADVANCE. 
1. The PC has to support booting from a USB flash/pen/key drive. There may be anywhere from 1-3 items to change in the BIOS to make this possible assuming your BIOS supports it. Some bios's may refer to your flash drive as a USB floppy or USB zip. Of course there are exceptions, perhaps some are covered here. 
2. The USB flash drive must support booting from it in general. 
3. The flash drive must contain the boot/system files. 
4. The flash drive must have bootsector area. This is done with special utilities. 
5. References to "A:" drive lines in the autoexec.bat and/or config.sys files you copy to the drive after you make it bootable may result in errors. 
6. You "may" have to format your floppy disk first in WinXP before you create a bootdisk as XP may "not" like working later on with a disk formatted otherwise. 
7. Included below is a bootable ISO of DOS 7.1 which may be used with some of these methods if you do not have a 1.44 drive. 


METHODS 
Method 1 - Make your flash drive bootable using Bart's mkbt util: 
http://www.nu2.nu/mkbt/ | Alt: mkbt20.zip 
Put a bootable floppy disk in your A: drive or create one using Windows. 
Download mkbt20.zip and unpack to to new temp folder you create. 
Go to the temp folder. 
Extract the bootsector from the bootable floppy disk. eg Open a DOS Window and go to the directory where you extracted MKBT. Type: 
mkbt -c a: bootsect.bin 
The boot sectors from the bootable floppy disk have just been saved to a file in the temp folder you created. 
Format the flash drive in FAT or FAT16. 
Copy the bootsector to the flash drive. Open a DOS Window and go to the folder where you extracted MKBT. Type: 
mkbt -x bootsect.bin Z: 
"Z" represents the flash drive drive Letter. So if your flash drive has another drive letter, then change the "Z" accordingly. 
Now you can [grin] "should" be able to copy the utils you need to the pen drive. 


Method 2 - Try these 2 USB Flash Drive Utilities by HP/Compaq. They work with Most other brands of flash drives as well. 
hpflash2.zip HP USB Disk Storage Format Tool. Formerly called hpflash1.zip 
HP Drive Key Boot Utility Version 7.41 
Download 
"I would put a little extra in there." Says a fan who emailed me with no name:) 
For the downloads section I use nLite to make and create the image file as you can import the service packs and do some tweaking to the install files. 
http://www.nliteos.com/download.html 
1. Install the HP USB Disk Storage Format Tool and run the program. 
2. Select the Device and the File system from the drop down menus and click start. 
3. Close the above program and install and run the HP Drive Key Boot Utility. Selecting the appropriate drive letter. Click Next. 
4.Select the circle on the top that says create New or Replace Existing Configuration. Click Next. 
5. Select the circle labeled Hard Drive. Click Next. 
6. Select Create New Filesystem. Click Next. 
7. Select the circle labeled HP Firmware Flash Package. Click Next. 
Click Finish 


Method 3 - Third Party Links 
Boot off USB by floppy, CD, or NT boot menu when your computer doesn't support it 
"I use it to boot off of USB by floppy when the computer doesn't support it - although in this mode it cannot save changes made to the setup." said Josh. 


Method 4 - A Bootdisk.Com Visitor Suggested 
Here is my another method for creating dos bootable USB sticks using windows format. 
1. From Win98 DOS-Prompt type "SYS {USBDriveLetter}:" or "FORMAT {USBDriveLetter} /U /S". If from WinXp then from start->run command.com execute format.exe copied from win95 or win98. 
OR 
2. Simply by enabling copy system files in windows explorer format window. By default it is disabled for non-floppy drives. To enable it use windows enabler program fromhttp://www.angelfire.com/falcon/speedload/Enabler.htm an whoila it works. 


Method 5 - Another Bootdisk.Com Fan Suggested - Thanks Keith 
First if you don't have a physical floppy drive (and don't want one) you can use the [free] "virtual floppy driver" from here: 
http://chitchat.at.infoseek.co.jp/vmware/vfd.html 
With that you get an A: drive and can manipulate a floppy image as if you were using real floppy. You can then use that image to make a bootable CD. It's not that user friendly but once you get how it works it does work perfectly. 
Even cooler you can use a "raw write" utility like dd for windows to write the floppy image directly to your USB thumb drive. Even without that famous HP utility to do the magic this will make your USB thumb drive bootable. The 'dd' ported to Windows is located here: 
http://www.chrysocome.net/dd 
Another trick you can use with that dd utility involves MS VritualPC (which is free). You can create a virtual machine/virtual hard drive, set it up the way you want then use dd to "raw write" the virtual hard drive image to the thumb drive; this will make the thumb drive identical to the image, including bootable (again, no HP utilities required).
Of course, your thumb drive will effectively have the capacity the size if the image in question (your 1GB flash drive will effectively be 1.44 Megs). 


Method 6 - Don Wrote below, or see this link from Justin: 
http://kmwoley.com/blog/?p=345 
bootable USB guide, here we assume that you are using either Vista or Windows 7 to create a bootable USB. 
1. Insert your USB (4GB+ preferable) stick to the system and backup all the data from the USB as we are going to format the USB to make it as bootable. 
2. Open elevated Command Prompt. To do this, type in CMD in Start menu search field and hit Ctrl + Shift + Enter. Alternatively, navigate to Start > All programs >Accessories > right click on Command Prompt and select run as administrator. 
3. When the Command Prompt opens, enter the following command: 
DISKPART and hit enter. 
LIST DISK and hit enter. 
Once you enter the LIST DISK command, it will show the disk number of your USB drive. In the below image my USB drive disk no is Disk 1. 
4. In this step you need to enter all the below commands one by one and hit enter. As these commands are self explanatory, you can easily guess what these commands do. 
SELECT DISK 1 (Replace DISK 1 with your disk number) 
CLEAN 
CREATE PARTITION PRIMARY 
SELECT PARTITION 1 
ACTIVE 
FORMAT FS=NTFS 
(Format process may take few seconds) 
ASSIGN 
EXIT 
Don't close the command prompt as we need to execute one more command at the next step. Just minimize it. 
5. Insert your Windows DVD in the optical drive and note down the drive letter of the optical drive and USB media. Here I use "D" as my optical (DVD) drive letter and "H" as my USB drive letter. 
6. Go back to command prompt and execute the following commands: 
D:CD BOOT and hit enter. Where "D" is your DVD drive letter. 
CD BOOT and hit enter to see the below message. 
BOOTSECT.EXE/NT60 H: 
(Where "H" is your USB drive letter) 
7. Copy Windows DVD contents to USB. 
You are done with your bootable USB. You can now use this bootable USB as bootable DVD on any computer that comes with USB boot feature (most of the current motherboards support this feature). 
Note that this bootable USB guide will not work if you are trying to make a bootable USB on XP computer. 

Enable and disable task mamanger

Sometime you may come across this problem with your computer, when you press "ctl+alt+del" to start task manager, you are popped up with error message saying "your task manager is disabled by administrator" even after you being the administration of your computer, this may happen due to malware running in your system.


Here is how you can enable disable task manager in windows :

1.  press "win+r" to open run box
2.  type "gpedit.msc" in the Open run box and click OK 
3.  "Group Policy Editor" window will open.
4.  Select "User Configuration" from left tree pane.
5.  go to "Administrative Templates" 
6.  go to "System" 
7.  Select "Ctrl+Alt+Delete options" 
8.  Double-click the "Remove Task Manager" option from right pane.
9.  from pop up window showed up. select enable/disable button and click "apply".

if task manager is again disable automatically, scan the computer for malware using any good antivirus and remove the malware first and try doing above steps.

Run command for add/remove program

Most of the windows system program can be opened from "run" dialog box. sometime it is easy to put command in "run" box instead of browsing program with mouse.

To go to Add/Remove program directly steps are:

1. Press  Win + R to open run dialog box.
2. type "appwiz.cpl" and press enter.

Check if java is installed

folks, Java virtual machine which makes software platform independent. many java based application pre-requisites java virtual machine be installed in pc. you can check if java is installed on your pc or you can also check which version of java is installed. you can check it by a simple command in dos command prompt. This is how you can do this...

1. win + r to open "run" box.
2. type "cmd" and press enter.
3. then simply type "java -version"

Common Keyboard Shortcuts

Keyboard shortcut is used bye proficient pc user to do work faster. here is list you can use ...

Key combination	Function
Alt+Enter	Display properties for the selected item
Alt+Esc	Cycle through items in the order in which they were opened
Alt+F4	Close the active item, or exit the active program
Alt+Spacebar	Open the shortcut menu for the active window
Alt+Tab	Switch between open items
Alt+underlined letter	Display the corresponding menu
Alt+underlined letter	Perform the menu command (or other underlined command)
Alt+Up Arrow	View the folder one level up in Windows Explorer
Ctrl with any arrow key+Spacebar	Select multiple individual items in a window or on the desktop
Ctrl+A	Select all items in a document or window
Ctrl+Alt+Tab	Use the arrow keys to switch between open items
Ctrl+C (or Ctrl+Insert)	Copy the selected item
Ctrl+Down Arrow	Move the cursor to the beginning of the next paragraph
Ctrl+Esc	Open the Start menu
Ctrl+F4	Close the active document (in programs that allow you to have multiple documents open simultaneously)
Ctrl+Left Arrow	Move the cursor to the beginning of the previous word
Ctrl+Mouse scroll wheel	Change the size of icons on the desktop
Ctrl+Right Arrow	Move the cursor to the beginning of the next word
Ctrl+Shift	Switch the keyboard layout when multiple keyboard layouts are enabled
Ctrl+Shift with an arrow key	Select a block of text
Ctrl+Shift+Esc	Open Task Manager
Ctrl+Up Arrow	Move the cursor to the beginning of the previous paragraph
Ctrl+V (or Shift+Insert)	Paste the selected item
Ctrl+X	Cut the selected item
Ctrl+Y	Redo an action
Ctrl+Z	Undo an action
Delete (or Ctrl+D)	Delete the selected item and move it to the Recycle Bin
Esc	Cancel the current task
F1	Display Help
F10	Activate the menu bar in the active program
F2	Rename the selected item
F3	Search for a file or folder
F4	Display the address bar list in Windows Explorer
F5 (or Ctrl+R)	Refresh the active window
F6	Cycle through screen elements in a window or on the desktop
Left Alt+Shift	Switch the input language when multiple input languages are enabled
Left Arrow	Open the next menu to the left, or close a submenu
Right Arrow	Open the next menu to the right, or open a submenu
Right or Left Ctrl+Shift	Change the reading direction of text in right-to-left reading languages
Shift when you insert a CD	Prevent the CD from automatically playing
Shift with any arrow key	Select more than one item in a window or on the desktop, or select text within a document
Shift+Delete	Delete the selected item without moving it to the Recycle Bin first
Shift+F10	Display the shortcut menu for the selected item
Win + Tab	Cycle through programs on the taskbar by using Aero Flip 3-D

Make bootable CD/DVD using PowerISO

1. Run PowerISO.
2. Click on the "New" button on toolbar or choose  the "File > New > Data CD / DVD Image" menu.
3. Click on the "Add" button on toolbar to add files and folders. You can also directly drag files and folders from Windows Explorer to the PowerISO window.
4. Choose the menu "Action > New Folder" to create a new folder.
5. Choose the menu "Action > Change Label" and put new label name..
6. Choose the menu "File > Properties" to set the iso file properties.
7. Click on the "Save" button on toolbar, or click on the "File > Save As..." menu.
8. Choose the menu "Action > Boot > Add Boot Information" to load a bootable image file.
9. Save the iso file to "Standard ISO Images (*.iso)" format.
10. To make bootable CD, please burn the iso file to a blank CD / DVD disc.