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• How to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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• Accessing locally hosted webpage via public IP

  - by Mk12

  Sorry if this is in the wrong place.I don't really know anything about server-related things, but I'm really curious about this. On my mac I figured out how to make a simple web page viewable via the local ip address or computer name on the LAN, and also how to hook it up with a free hostname from dyndns.com. So the dyndns hostname points to something, how can I access it directly? Typing in the global ip address (of the router) doesn't work, but if it did, how would it know which computer to point to? There must be some way of directly accessing what dyndns hostname points to by typing in some number, right? Sorry I don't really understand how it works.

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• Windows Server 2003 Standard R2 CD 1 cannot boot: freeze at No Emulation

  - by TGP1994

  Hi everyone. I've been interested in the Windows Server line of OSes, so since I apply for DreamSpark, I thought I'd go download it and try it. I just so happened to have an old desktop that I was using awhile ago for Windows XP, so I imaged the drive in preparation for it to be overwritten with the new OS. (This system has an Asus A7V8X-X motherboard, an AMD Athlon XP 2800+ processor, and 1GB of RAM.) I tried burning the first disk image on my newer desktop computer, running Windows XP, although the CD burner consistently failed at a particular track area from cd to cd, so it seemed like the burner was toast there. Fortunately, I had a laptop, so I transferred the images over to that, then burned the first disc there. First time around went great, and the burning program reported no errors. I then took the CD over to the computer that I was intending to install Server onto, set the BIOS to boot from the CD drive, then I booted it up. Like normal, after the POST, it printed "Boot from ATAPI CD-Rom: No Emulation", which I was used to seeing with bootable cds. I waited for the "Press any key to continue..." message that I had become so familiar with in windows discs, although I saw none. The computer sat there for about 5 seconds with the cd spinning, then it spun down like it was done reading it. Nothing else happened. No response from the keyboard. I tried again, same result. I then downloaded IMGBurn, and I put the burned cd into the laptop that burned it originally. I also downloaded a fresh image from the dreamspark site. I ran a verify session, and everything checked out. I later tried getting various DOS startup discs, then I tried booting the winnt binary, which supposedly initiates the installation process. Either the shells reported that not enough memory was available (since they would be running in low memory mode), or FreeDOS in particular would report Illegal instructions right away. Is the image corrupt at dreamspark, or am I doing something wrong?

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• Program can't start because dll is missing

  - by Kruug

  Any executable that I attempt to run on this laptop pops up an error stating The program can't start because LPK.dll is missing from your computer. Try reinstalling the program to fix this problem. I have tried doing regsvr32 lpk.dll from within system32, but that returns the error The module "lpk.dll" was loaded but the entry-point DLLRegisterServer was not found. Make sure that "lpk.dll" is a valid DLL or OCX file and then try again. I was able to copy the DLL file from a working computer, but I get the same issue. How would I go about registering this DLL? Or, alternatively, which program would I have to reinstall to get the DLL to work again? The system is Windows 7 Professional 64-bit with Service Pack 1. I would really like not to reinstall the OS, but at this point, I'm about ready to.

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• Remote desktop to multiple windows machines on a LAN with dynamic IP

  - by kevyn

  Is it possible to use remote desktop to connect to multiple computers inside a network that has a dynamic IP address? I use a netgear WPN824 router which has dyndns onboard - but I currently use No-IP to control a single computer that I use most frequently. Every so often I need to get onto a couple of other computers in the network, but don't know how to go about this without logging onto one computer, and then starting another RDC session from that machine. What I would like to be able to do is connect to my router, and be able to see a list of connected devices, and then choose which to remote desktop onto. - I appreciate this probably is not be possible, but any other suggestions are welcome!

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• Black login screen Ubuntu 12.04 if WGA cable pluged in on reboot

  - by Sulliwane

  I'm using Ubuntu 12.04.1, 64 bits, installed on a Z77 Pro4 (ASrock motherboard), crucial M4 SSD drive (sata 3), and intel i5 3570k (ivy bridge). I have this annoying problem : When I startup the computer, I get a CLI login prompt : At this moment, if I press enter, i get the usual CLI login prompt. If not, here is what I get : From now, if I login using CLI, i identify the lightdm processus, kill and start it : #ps -A | grep lightdm #sudo kill -9 1273 #sudo lightdm and miracle, these commands bring back the gui login screen. BUT It's very annoying as I have to repeat these steps at every boot, and the people using this desktop are not familiar with linux at all! So I tried to figure out the cause and here is what I found : If, when I shutdown the computer, the WGA cable is not pluged in, then Ubuntu will boot on GUI login screen without a glitch! But If the WGA cable is pluged in when shuting down, I will get CLI login prompt... Note 1: I installed linux kernel 3.4, but it hasn't solve the problem. Note 2: Is it linked to the new HD 4000 integrated graphic processor ? Note 3: If i boot on an USB stick (Ubuntu 12.04), NO problems ! Note 4: If booting on the SSD, when clicking "shutdown" button, the shutdown process never ends up (logout screen keep displaying and fans are still rolling). But if booting on USB stick, the shutdown action runs properly.

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• Avoid cache overflow in Atempo LiveBackup

  - by Vebjorn Ljosa

  When attempting the initial backup of a new client, Atempo LiveBackup seems to require a very large cache. For instance, a 20 GB cache is not enough to back up a computer that has 100 GB of data. It appears that LiveBackup is adding new files to the cache at a faster rate than it can send them to the server. When the cache fills up, the backup fails. Aside from removing most data from the computer and then add them back gradually after the initial backup, is there a good workaround? Is it possible to make LiveBackup slow down its scan so as to not fill the cache? Or is it possible to place the cache on an external drive?

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• How do I uninstall GRUB?

  - by ændrük

  A hard drive that I use only for data storage still has GRUB from past Ubuntu installations. How can I remove GRUB from it without harming the rest of the drive's data? Background I occasionally move the data drive between computers with various boot order configurations, so I would like it to be non-bootable in order to avoid having to accommodate it in each computer's BIOS settings. When I power on a computer while only the data drive is attached, the following appears: error: no such device: fdf38dd4-9e9d-479d-b830-2a6989958503. grub rescue> I can confirm from old backups of /etc/fstab that this was the UUID of a root partition that I recently reformatted and which no longer exists. Here's the the data drive's partition table and raw master boot record. Please note that I'm not interested in workarounds that don't answer my primary question. I can think of several ways to work around this issue, but it bothers me on principle that I don't know how to directly resolve it. Every installation procedure should have a counterpart uninstallation procedure.

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• cannot boot Ubuntu after fresh install

  - by Jonathan

  I just installed Ubuntu on a Lenovo v570, and cannot boot into the system. All I get is a loop, where some (bios) info is displayed, and then the computer asks me where I would like to boot from. I tried reinstalling, reinstalling with a custom partition scheme, and boot -repair after the install. None of these work. I can see the files on my harddisk have been copied. I have installed many Ubuntus in the past, as well other distros where custom partitioning is required. I don't know where to find any useful information since I don't even get too the grub menu. One odd thing I noticed. The bios now had options to boot USB, OpenSuse,Fedora, or the HD. I am not dual booting. I also realized that the boot info is for a network boot, which means the computer is not recognizing what to boot. It is boot an HD problem, because I can install other OSs just fine. I am completely stumped. I would like to settle this, and end up with a tutorial, that explains to me what happened.

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• Windows XP Blue-Screens And Reboots Instantly On Boot-Up

  - by ashes999

  My computer was running perfectly until yesterday; my internet suddenly died. Being wireless, I decided to reboot; now the computer doesn't boot. It shows the "Starting Windows" screen (safe mode loads several drivers), then it suddenly blue-screens and immediately reboots (I cannot read the blue-screen contents at all). I've tried safe-mode (with and without networking); no dice. I booted another HD with another XP install and ran scandisk on my HDs; no bad sectors, and even with auto-repair, it didn't fix the problem. Now what? What are my options to fix the broken XP install? I'm thinking: 1) Remove wireless card 2) Run XP install CD and repair installation 3) ???

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• Self-imposed lockout from program

  - by Alex

  I'm plagued with a lack of willpower. I recently started looking for solutions, and came across a program for macs called SelfControl which completely blocks one's access to a given set of websites for a given period of time (you can delete the program/restart your computer/do almost anything and it will still block those sites for the specified time period, and doesn't require a password to do it.) Unfortunately, there are no windows analogues. The one that comes the closest is Cold Turkey. It has the functionality whereby you set a time in the future, specify a list of websites (or programs - eg explorer, firefox, chrome) and you are blocked from accessing them for the whole duration. No password can undo it, no system reboot, etc. The problem is that the program is a buggy piece of garbage, and in order to ensure that you're not locked out from websites forever, you have to run an uninstaller which is just an exe file accessible at any time which completely defeats the purpose of a self-imposed program lockout. I want to make a better version of that program, or find a simple way to prevent access to a given set of programs over a given period of time with no way around it. I've only taken a few introductory courses in java (math major), but the internet is really having a negative effect on my studies, and the only way I can do work is to eliminate all distractions. What do I need to learn in order to make a program with the following properties: Given a set of .exe files, and a time in the future , this program will prevent access to the given .exe files until current time = given time restarting the computer doesn't interfere with the program, one can't uninstall the program until current time = given time, one can't create another instance of the program to block itself I don't care how much programming knowledge i need to acquire in order to make this program, so please give me a specific list of things that I need to study in order to make this happen, or if something like this exists, then please let me know.

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• hardware: delay and distinct 'click' before hard drive access

  - by matt lohkamp

  I have a windows 7 box stashed away in my closet, containing (among other things) 2 big HDDs linked together as a mirrored volume - basically a super lazy NAS / media server. I've noticed that when that drive is accessed (whether locally, on the machine itself, or remotely, from another computer, or my xbox, for example) there's a noticeable pause, and then from the computer itself, a 'click!' noise, after which the drive is accessed; e.g. open \\computername\shared\, wait 2 seconds, hear 'click!' and then see files appear in windows explorer. Any ideas? Otherwise the drive preforms normally - is it a windows thing? a HDD-about-to-die thing? Or a "yeah that always happens, you've just never noticed it before" thing?

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• Ubuntu won't log in after update

  - by Dave M G

  I just updated Ubuntu about 15 minutes ago on my desktop which is running 12.04. Within the set of updates, there were some kernel upgrades. It didn't say I needed to reboot after the update was finished, but I thought I would anyway. The computer successfully rebooted up to the login screen. However, after entering my password, the screen goes black for a moment, then it comes back to the login screen. I tried the suggestions in this question, but unfortunately they didn't help. In the accepted answer, the questioner vaguely says it was a "Unity problem". I'm using Gnome-classic with full Compiz effects. I tried uninstalling and reinstalling Compiz, but that didn't fix anything. So... I can't use my desktop computer until this is fixed. I hope there is some help soon. I've uploaded the output of cat /var/log/Xorg.0.log to Pastebin. A temporary solution of changing to gdm instead of lightdm was found with help in the chat room.

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• I have been told to accept one error with Memtest86+

  - by DustByte

  Bought a new computer back in August with 4x4 GB RAM. Had problems with the RAM. They sent me four new sticks, which also generated errors. Singled out four sticks (from the eight I now had) that didn't generate any errors. Discovered by coincident a new RAM error last week (this time no BSOD). Contacted the company. According to them there have been issues with a bad stock from last summer so I got two tested 8 GB sticks sent to me. Been running Memtest86+ over the weekend. After 20 hours I got an error (see attached photo). The test has now been running for 37 hours but so far only this one error. I contacted the company where I bought the computer. They wrote back: I wouldn't worry about hat one fail. We have had similar situations here whereby it passes numerous times but then fails once. We think it's an issue with memtest, after all memory is faulty or it isn't so you can't really have it pass a few times, fail the next time around and then pass again! Please trust me on this and continue with the memory we sent you and if your problems continue we'll look at getting it replaced again. I gather from other forum posts that many people do not accept a single error. What could this single error signify, faulty RAM or a glitch in the MEMTEST program (or other)? Update: From the helpful comments below I conclude that an occasional (and rare) "random" error could occur and be acceptable, but repeated errors at the same address would indicate malfunction. Memtest has now run for 45 hours and I still have only one error. For everyone's information, I will keep running the test. In less than two days I am going away for a month. I will most likely leave Memtest running. As I do not have a UPS there is a risk that a power outage will ruin the experiment. The computer is a desktop so I cannot bring it with me (which would curiously have exposed it to more cosmic rays as I will be flying ;)).

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• TCP > COM1 for receiving messages and displaying on POS display pole

  - by JakeTheSnake

  I currently have a Java Applet running on my web page that communicates to a display pole via COM1. However since the Java update I can no longer run self-signed Java Applets and I figure it would just be easier to send an AJAX request back to the server and have the server send a response to a TCP port on the computer...the computer would need a TCP COM virtual adapter. How do I install a virtual adapter to go from a TCP port to COM1? I've looked into com0com and that is just confusing as hell to me, and I don't see how to connect any ports to COM1. I've tried tcp2com but it doesn't seem to install the service in Windows 7 x64. I've tried com2tcp and the interface seems like it WOULD work (I haven't tested), but I don't want an app running on the desktop...it needs to be a service that runs in the background. So to summarize how it would work: Web page on comp1 sends AJAX request to server Server sends text response to comp1 on port 999 comp1 has virtual COM port listening on port 999, sends data to COM1 pole displays data

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• Direct wan ip behind router

  - by DanSpd

  I need to have a wan ip to be listen in ipconfig but computer is behind router.

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• Internet problems

  - by dan

  I've got problems on my freshly installed windows Xp machine. I cannot connect to the internet and I've tried various 'solutions' provided to me by the help and support center. Surprisingly none of them worked... Anyways, I've got 3 pc's next to me sharing a lan which is connected to the internet though a modem. The computer I use right now uses windows xp aswell and runs without any problems. I've tried everything on not working computer. I've ran the connection wizard several times, but it's not working :( Also I've very little experience with this version of windows, so I'm sorry if the solution is obvious.

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• PC cannot see Clonezilla server when using PXE Boot

  - by r2b2

  Hi I have about 15 workstations, all have the same hardware specs so I figured clonezilla is perfect for cloning them. So I followed everything this guide says :cloning groups of school computers That guide above makes it all look easy but when I tried setting up Clonezilla Server Edition on my laptop (Kubuntu 10.10) and configured the master computer for PXE boot, the master computer could not see the Clonezilla server. It just shows 'DHCP...' which seems it trying to grab an IP address but to no avail. Please help. Thanks!

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• Printing on Windows 8 64-Bit through Windows Server 2008 (32 Bit) RemoteApp

  - by Chris

  We have a network where our server is running on Windows Server 2008 (32 Bit) and a client computer is running on Windows 8.1 (64 bit) with a local printer attached to the client. The printer is an HP P1006. The remote app works well but when trying to print we get an odd "error 545". We have tried both using the "connect client printer" function in remoteapp and also making the printer shared over the network and printing to it via the network from within the remoteapp. Nothing works. We can print a test page from the server to the client computer just fine, but it seems from remoteapp we cannot. We have also tried installing the 32 bit drivers on the 64 bit machine as both the primary and secondary drivers but cannot get them to install. Suggestions please? We've been going crazy over this issue.

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• Can't mount home after trying to resize (bad geometry: block count exceeds size of device).

  - by Lynn

  This is on a fresh computer (super computer actually). It got to me with 15T on the home mount and 50G on the root. I tried allocating 7T to root and resizing (since I'm putting a local yum repo on this machine as it has no internet access nor will it ever). I tried following the instructions here: Centos 6.3 disk space allocation but something went wrong and the home won't mount again. Instead I get from dmesg | tail: EXT4-fs (dm-2): bad geometry: block count 4294967295 exceeds size of device (1342177280 blocks) df -h nets this output: Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup-lv_root 7.0T 3.6G 6.6T 1% / tmpfs 190G 216K 190G 1% /dev/shm /dev/sda1 485M 38M 422M 9% /boot I didn't have any files on /dev/mapper/VolGroup-lv_home. Will simply running mke2fs fix it to be mountable? What sort of options should I run it with. I've never resized volumes before or used mke2fs. I don't want to make this mess worse.

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• Windows 8 will only recognize the Blu-Ray drive, if the Windows 8 disc is present at boot time

  - by aceinthehole

  If I have the install disc in the Blu-Ray ROM drive at boot time and subsequently remove the disc and replace it with Blu-Ray media, everything functions as I’d expect. However, if I have no media present, or another disc in the drive at boot time, then Windows 8 does not seem to recognize that the Blu-Ray player is even present in the computer. It is not present in My Computer, the Device Manager does not show the player, and scanning for new hardware yields nothing. It seems that the driver is installed and working as expected, but what is it about having the Windows 8 install disc in the drive or not that would cause this kind of behavior?

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• Keyboard-Shortcut driffen Utility to move windows around on multiscreen setup

  - by Wolfgang Fahl

  I am looking for a utility to move windows around on a multiscreen (usualy dual screen) setup. So with a keybord shortcut (or mousclick) I would like to send a windows to another monitor. I am using this functionality a lot when I give presentations. I'll lookup something on my mainscreen and then send the window to the screen or beamer where others can see it. Its also useful when working or when I want to send a screen from my computer to the TV screen that is hooked up to the computer. I know two solutions for a) Windows b) Mac OS but none yet for Linux. I'll post my windows and Mac OS solutions as answer and would be interested in other opinions.

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• How To Use the Restore Partition to Break Into a Mac Running OS X Lion

  - by Justin Garrison

  It’s trivial to break into a Mac using an OS X boot disk, but new Macs use a restore partition for OS installations. Here’s how you can use that partition to reset a user password and break into a Mac. All laptops that come with OS X 10.7 “Lion” or laptops that were upgraded to Lion have a restore partition for easy OS recovery. This easy-to-use recovery partition also opens up hackers to break into your Mac without needing any additional tools. To reset a user password on a Mac with Lion you first need to restart the computer and hold the Command+R (?+R) keys. When the gray Apple logo shows up on the screen you can release the keys. Your computer should automatically boot into the recovery partition. Start by selecting your language and then go to Utilities -> Terminal in the menu. How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2 How to Own Your Own Website (Even If You Can’t Build One) Pt 1

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• Frame rate upsampling codec/player/software?

  - by djechelon

  Hello, I recently noticed that when I play both HD and SD videos on my HDMI TV at 1080p 60Hz from my computer, the motion is not fluid as I would expect. As far as I know, it could be because the 24fps video needs to be upsampled by the codec to match the 60Hz output of the monitor. But, as far as I know, the upsampling is done by simply repeating each photogram for a certain amount of frames. I usually play MKV videos with VLC. Do you know if there is a player or codec that performs the upsampling by interpolation like some 100Hz TVs do? I recently saw an LG led TV play a 24fps 720p video at 100Hz with an incredible motion fluidity, and I simply wonder why can't my computer do! I have an NVidia card. Does PureVideo help? I'm a noob with these things. Thank you.

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• Is there a limit on the number of USB external drives?

  - by Beska

  I've got three external HDDs, all My Books, 500 GB, 750 GB, and 1 TB. If I hook one or two of them up to a computer, everything seems fine. If I hook all three of them to a computer (I've tried this on two different computers, one running Windows XP, one running Windows Vista), the bootup time goes up by more than an order of magnitude. It can suddenly take about 10-20 minutes to boot the machine, whereas before it might take a minute. All three drives work fine on their own. I'm not using any kind of hub; all three are plugged directly into the machine. Is this associated with some kind of inherent limit in USB? Is this bad hardware design in the CPU box? Is this a My Book problem?

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