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• Screen Flickering: Hardware or Software?

  - by Wesley

  I have a Samsung N120 netbook (upgraded to 2GB DDR2 RAM) and there has been a screen flickering issue for some time now. However, I have not been able to accurately determine whether it is a software or hardware issue. Here are some of the symptoms: The flicker is white-colored and shows up as vertical lines. Flickering or not, there may be occasionally some random blue patterns (no image distortion) The screen tends to flicker more when the screen is not tilted back all the way. When tilting the screen back and forth, the screen will usually flicker. Some images on the screen may randomly distort without full-on flickering. The screen will flicker only on certain websites, but not on others. A certain part of a webpage may constantly be distorted randomly, even when scrolling. While flickering, the mouse will not move though I'm moving my finger along the touchpad. A connected external monitor does not have any problems. The flickering is completely random and does not seem to follow any CPU/GPU usage trends. Flickering usually gets worse when the screen brightness is turned higher. There will be flickering on battery and while plugged in. Search up "Samsung N120 - Screen Flickering" on YouTube for an idea of what the flickering looks like. However, there is no visible distortions and the flickering seems to stop when the screen has dimmed. Since the problems started, I tried formatting and using Windows 7, then formatted again and went back to Windows XP. The screen was also replaced sometime during this past summer. The uninstallation of the Samsung Battery Manager (on the original install of XP) seemed to reduce the flicker partially, but eventually got worse. So, what could possibly be the problem?

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• My wifi internet router connection resets when more devices connected

  - by joeeoj

  The wifi internet router is connected directly to Internet cable. The main Pc is attached to it via LAN cable, while 1 laptop and 3 mobile phones connect to it via wifi. Whenever 2 or more devices connect via wifi, the internet connection breaks after one minute and internet connection resets. I tracked this behaviour for weeks, and came to conclusion: It seems like some 'device 1' got IP then it went to suspend mode. Then 'device 2' connected to router and got the same IP. Then the 'device 1' woke up from suspend mode and tried to use his old IP. The router sees that 2 same IP addresses exists and automatically reset internet connection. Is this possible? Have I tracked the problem correctly and how to solve it? The router is set to lease 100 IP addresses to devices who try to connect. The password is strong and no hacker's device is being connected to my wifi network. Tried changing password and AP's name.

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• Patch msp into msi package

  - by Kvad

  The latest update of Windows Live Messenger is an msp added to the package. I want to patch a msp into an msi. Reference download http://wl.dlservice.microsoft.com/download/8/3/D/83D75746-DF04-45E9-8374-BD31B9419128/en/wlsetup-all.exe I extract all msi and msps from this. (To get the msp and msi's I did the following Use resource hacker to open up wlsetup-all.exe In the left hand tree browse to PACKAGE Right click PACKAGE, save PACKAGE resources Save to a new temp folder Eg. D:\temp\package.rc This will output a whole lot of .bin files These are just cab files so we need to do a mass rename “ren *.bin *.cab” Once done select all cab files and extract to a new sub folder \extracted In \extracted you will see all the msi, msp and 7z files you need) I try to apply the msp directly with no result msiexec /p messenger.msp /a messenger.msi I also try doing a admin install with nothing being extracted.

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• How to interpret iozone values

  - by Henno

  I ran a test to measure my I/O IOPS on Linux: iozone -s 4g -r 2k -r 4k -r 8k -r 16k -r 32k -O -b /tmp/results.xls iozone claims that output is in operations per second yet the numbers are too big for that to be plausible. I'm observing some 320 CMDs/s maximum on vmware esx console (esxtop, then v). File size set to 4194304 KB Record Size 2 KB Record Size 4 KB Record Size 8 KB Record Size 16 KB Record Size 32 KB OPS Mode. Output is in operations per second. Command line used: iozone -s 4g -r 2k -r 4k -r 8k -r 16k -r 32k -O -b tmpresults.xls Time Resolution = 0.000001 seconds. Processor cache size set to 1024 Kbytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 4194304 2 19025 5580 27581 29848 284 198 415 1103217 1498 18541 4340 24245 25618 4194304 4 15650 21942 18962 21068 252 1198 193 976164 1677 22802 23093 21089 21232 4194304 8 11121 11638 10273 10165 247 1196 202 625020^C The test ran for 15 hours before I pressed ^C. Is that ordinary expectation for such command line (dedicated 4 drive RAID10 LUN, 10k RPM SAS drives in EMC CX300)?

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• Detect damage done by virus

  - by user38471

  Hey, this morning after I went to college a virus infected my pc without any user interaction at my end. When I came home my computer was completely frozen and infected with lots of trojans. I have not typed anything important since returning so keys cannot be logged. However I want to know exactly when my computer crashed from the time of infection to see what could potentially be done remotely by a hacker. The virus my pc was diagonosed with was "fakespypro" http://www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=Win32%2fFakeSpypro on a fully updated windows 7 installation with firewall enabled. My computer was connected to an internal dorm room network, so probably that has had to do something with it. Any further information about how I could backtrace this virus infection or ways to discover what data might be stolen would be greatly appriciated.

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• Favicon on gmail has changed from the envelope to a black gun. How do i change it back and why did i

  - by Victoria

  I think my gmail account might have been hacked because I've recently noticed a change in the favicon displayed in the url and the tab, when I logged onto my gmail account. It used to be the common red and white envelope and now it's a black gun. Can anyone tell if this is enough to conclude that my account has been hacked or tampered with? I know someone that would be capable and most probably willing to cause problems to my account among other things. This would be my opsessive ex who's best friend is a hacker. Can anyone help? I need to know if someone has reigns to my computer. And how do I change the favicon back to its orginial image? The black gun really bothers me. Thanks everyone!!!

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• How to make a Linux software RAID1 detect disc corruption?

  - by Paul

  This is one of the nightmare days: A virtualized server running on a Linux SW-RAID1 runs a VM that exhibits random segfaults in seemingly random codechunks. While debugging I find that a file gives different md5sums on each and every run. Digging deeper I find this: The raw disc partitions that make up the RAID1 mirror contain 2 bit-differences and ca. 9 sectors are completely empty on one disc and filled with data on the other disc. Obviously Linux gives back a sector from a undeterministically chosen disc of the mirror set. So sometimes the same sector is returned OK, sometimes the corrupted is given back. The docs say: RAID cannot and is not supposed to guard against data corruption on the media. Therefore, it doesn't make any sense either, to purposely corrupt data (using dd for example) on a disk to see how the RAID system will handle that. It is most likely (unless you corrupt the RAID superblock) that the RAID layer will never find out about the corruption, but your filesystem on the RAID device will be corrupted. Thanks. That will help me sleep. :-/ Is there a way to have Linux at least detect this corruption by using sector checksumming or something like that? Would this be detected in a RAID5 setup? Is this the moment I wish I used ZFS or btrfs (once it becomes usable without uber-admin capabilities)?

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• Detecting damage done by virus

  - by user38471

  This morning after I went to college, a virus infected my PC without any user interaction at my end. When I came home my computer was completely frozen and infected with lots of trojans. I have not typed anything important since returning so keys cannot be logged. However I want to know exactly when my computer crashed from the time of infection to see what could potentially be done remotely by a hacker. The virus my pc was diagnosed with was "fakespypro" on a fully updated Windows 7 installation with firewall enabled. My computer was connected to an internal dorm room network, so probably that has had to do something with it. Any further information about how I could backtrace this virus infection or ways to discover what data might be stolen would be greatly appreciated.

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• How to close the logon process named NtLmSsp ?

  - by Aristos

  I have a windows 2003 server and time to time I am getting many login failures like this one. Logon Failure: Reason: Unknown user name or bad password User Name: administrator Domain: xx.xx.xx.xx Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: XLHOST Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: 173.45.70.100 <- hacker Source Port: 4722 AND Logon attempt by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 Logon account: user Source Workstation: XLHOST Error Code: 0xC0000064 The question is, how can I close this process of login ?, what I have left open and some one can try to login ? Some notes: I login to the server using tunneling, nothing is open except dns, email, and web ports, not even ftp, and all default ports are change and hidden. I also monitor port scan and capture any one that try to find the hidden ports. Probably it is something open... Thank you in advanced.

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• My server appears to have been hacked+ scanssh run by zabbix is it normal?

  - by Niro

  I'm running a few EC2/Scalr instances with zabbix monitoring. I received complaints about one of my servers port scanning other servers. the logs show it is accessing port 22 on consecutive IP addresses. I looked at the processes list and saw scanssh is running under the user Zabbix. My question is- Is scanssh part of zabbix? Is it suppesd to run? I have active autodiscovery on zabbix but it is looking at another IP addresses and definately not port 20. Is it possible that something in the config of zabbix agent is controlling it and not the settings on zabbix server? What can I do to find out if zabbix is somehow misbehaving or it is a hacker? Any advice is highly appreciated.

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• How do you map a solo press of a modifier key to its own function or mapping on Windows?

  - by Conrad.Dean

  Today on hacker news there was a clever article on custom shortcut keys. The author talks about a technique for remapping a modifier key such as CTRL to ESC if CTRL were pressed without a modifier. This is useful in vim because of how often you need to press ESC. Another technique he describes is mapping the open parenthesis, ( to the left shift key, and ) to the right shift key. If another key is pressed when shift is held down, the shift key behaves normally. The author describes the software he uses on OSX, but is there a way to do this on Windows? I've heard of AutoHotKey but it seems to only fire macros when simple keys are pressed, rather than the conditional state switch that this would require.

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• Secure Apache Virtual Hosts?

  - by Dr Hydralisk

  I am going to host a few small sites on VPS, and each of them are going to run my own custom PHP scripts. I am fairly certain that they are secure (did everything in the book, plus some of which is not in the book) to make sure they can't be exploited. But just to be safe I want to know how I could secure each of the virtual hosts so that they can't escape from there virtual host (if a hacker uploaded a shell they could not go above the www folder a legitimate user can't do in ftp no matter how many times they click ..) folder on Debian and Apache.

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• How can I format an SD card with a more robust Linux-usable filesystem with a specific cluster size for better write performace?

  - by Harvey

  Goal: microSD card formatted... for best write performance for use only with embedded Linux for better reliability (random power failures may occur) using an 64kB cluster size I'm using an 8GB microSD card for data storage inside an embedded Linux/ARM device. The SD card is not removable. I've been using ext3 instead of the pre-installed FAT32 because it seems to better handle random power failures during writes. However, I kept noticing that my write performance is always best with the pre-installed FAT32 from Kingston. If I reformat the card with FAT32, the performance still suffers. After browsing wikipedia, I stumbled upon the following comment saying that some cards are optimized for specific cluster sizes. In my case, the Kingston comes pre-formatted for an 64kB cluster size. Risks of reformatting Reformatting an SD card with a different file system, or even with the same one, may make the card slower, or shorten its lifespan. Some cards use wear leveling, in which frequently modified blocks are mapped to different portions of memory at different times, and some wear-leveling algorithms are designed for the access patterns typical of the file allocation table on a FAT16 or FAT32 device.[60] In addition, the preformatted file system may use a cluster size that matches the erase region of the physical memory on the card; reformatting may change the cluster size and make writes less efficient.

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• files have no ownership permissions and can't assign ownership

  - by Force Flow

  I'm having problems with file permissions on a server 2008 R1 server. Office 2010 tmp files are being created, and don't have any security permissions assigned. They aren't being deleted, I can't assign ownership, and I can't delete them. I downloaded and ran the sysinternals tool handle.exe. When running it for the first time, handle64.exe was created, but not assigned any permissions. I cannot assign ownership and cannot delete it. Seemingly random files in random places don't seem to have any permissions assigned. Access is denied when attempting to change ownership to administrator or the administrators group. If I try to replace inheritable permissions of the folder these files are in, access is denied for the files with no permissions. I attempted to use subinacl to view the ownership information on the files that had no permissions, but access was denied here as well. I also tried setting the owner with setacl in an elevated cmd window, but access was denied as well. This problem only surfaced in the last few days, and I'm unsure as what the cause is or how to correct it.

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• Solution to easily share large files with non-tech-savvy users?

  - by Tim

  Hey all, We've got a server setup at work which we'd like to use to exchange large files with known clients easily. We're looking into software to facilitate this, but somewhow typing "large file hosting" into Google gives questionable results.. ;) We've come up with the following requirements, and I hope any of you can points us in the direction of a solution that offers this functionality, or is malleable to our needs. Synchronization / revision management is of no concern, it's mostly single large (up to 1+ GB) file uploads & downloads we'll need. We'd like to make the downloads expire & be removed after a certain number of days / downloads, to limit the amount of cleanup we'd have to do. The data files exchanged sometimes hold confidential information, so the URLs generated should be random and not publicly visible. Our users are of the less technically savvy variety, so a simple webform would be best over a desktop client (because we also have to support a mix of operating systems). As for use of the system we'd either like to send out generated random URLs for them to upload their files, or have an easy way manage & expire users. Works on a linux (Ubuntu) server (so nothing .Net-related please) Does anyone know of software that fits the above criteria? We've already seen a few instances of this within the scientific community, but nothing we could use directly.. Best regards, Tim

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• Solution to easily share large files with non-tech-savvy users?

  - by Tim

  Hey all, We've got a server setup at work which we'd like to use to exchange large files with known clients easily. We're looking into software to facilitate this, but somewhow typing "large file hosting" into Google gives questionable results.. ;) We've come up with the following requirements, and I hope any of you can points us in the direction of a solution that offers this functionality, or is malleable to our needs. Synchronization / revision management is of no concern, it's mostly single large (up to 1+ GB) file uploads & downloads we'll need. We'd like to make the downloads expire & be removed after a certain number of days / downloads, to limit the amount of cleanup we'd have to do. The data files exchanged sometimes hold confidential information, so the URLs generated should be random and not publicly visible. Our users are of the less technically savvy variety, so a simple webform would be best over a desktop client (because we also have to support a mix of operating systems). As for use of the system we'd either like to send out generated random URLs for them to upload their files, or have an easy way manage & expire users. Works on a linux (Ubuntu) server (so nothing .Net-related please) Does anyone know of software that fits the above criteria? We've already seen a few instances of this within the scientific community, but nothing we could use directly.. Best regards, Tim

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• Security of BitLocker with no PIN from WinPE?

  - by Scott Bussinger

  Say you have a computer with the system drive encrypted by BitLocker and you're not using a PIN so the computer will boot up unattended. What happens if an attacker boots the system up into the Windows Preinstallation Environment? Will they have access to the encrypted drive? Does it change if you have a TPM vs. using only a USB startup key? What I'm trying to determine is whether the TPM / USB startup key is usable without booting from the original operating system. In other words, if you're using a USB startup key and the machine is rebooted normally then the data would still be protected unless an attacker was able to log in. But what if the hacker just boots the server into a Windows Preinstallation Environment with the USB startup key plugged in? Would they then have access to the data? Or would that require the recovery key? Ideally the recovery key would be required when booted like this, but I haven't seen this documented anywhere.

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• Perfectly reproducable select statement default ordering issue....

  - by Dave

  Hi, I've recently been chasing an issue with a client's db... solution found, but impossible to recreate. Essentially, we're doing a Select * from mytable where ArbitraryColumn = 75 Where MyTable has an Identity column, called 'MyIndentityColumn' - incremented by one in each insert. Naturally, and normally I would assume that the order returned would be the order in which they are inserted (bad assumption, but one which was forced onto me, through an inherited application - which has been patched). Essentially, I would like suggestions as to why the database, when restored to my local machine (same OS, same SQL server version - 200 sp3) same collation, and same backup instance restored on it, as a test DB on the client site. When I perform the above select, I get them in order of insert (i.e. identity column ordered ascending). On the client, it seems random (but the same 'random' order each time)... A few other points: I have the same collation on my test server as client Same DB backup restored to a test only I can access Same SQL server version and service pack Same OS Test DB is a new DB - new log and MDF... I have the problem 'solved' by adding an explicit order by clause but I want to undertand the cause of the issue, given the exact nature of my attempts to recreate it beuing futile, and perfectly recreatable on the client server... Thanks in advance, Dave

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• Weird problem with Visual C++ 2010 Express

  - by Robert Vella

  This has happened before on my Vista Premium installation, and now it's happening on my Windows 7 Home Premium installation. Basically everytime I install Visual Studio Express 2010, it works fine for a random amount of time but then suddenly starts to hide from my sight -- that's the best way I can explain it. VS does not crash, and from what I can tell it does not freeze either; It continues to work, I can even "minimize" and "maximize" it; I simply cannot see it nor can I interact with it any meaningful way. Also: After the "crash" there are no logs in: Root\Program Files (x86)\Microsoft Visual Studio 10.0\Microsoft Visual C++ 2010 Express - ENU. Nor any other files created at the time of the crash. There are no traces in the event viewer. The program seems to be functioning perfectly in the process manager. If I reinstall Visual C++, it works normally for a seemingly random period of time before going cookoo again. I am stumped. This has never happened to me before, with any other program. And yet I doubt it really is a problem with Visual C++; More like something general that seems to have picked on it for some reason. Still, after a clean install with a new OS, I'm kinda thinking there's something wrong here. Any help would be appreciated, altough I suspect that the answer to this question will make me feel embarassed. P.S. Not sure if it helps, but I think around the same time I started having problems (On both installations) with windows turning off the display when I leave the computer, and then seemingly crashing when it turns it on again -- in fact when I interact with it it seems to be responding to my commands without actually display anything.

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• how do I fix a wrong UUID in grub.cfg?

  - by mozerella

  I run Debian Wheezy alone on my PC and I recently copied the root partition to another with rsync as I found that worked well (I also know about dd and ddrescue but they leave unusable space on the new partition). I generated a new random UUID for the new partition with sudo tune2fs -U random /dev/hda9 and also updated fstab / and /home entries. Then as I know so little about GRUB I used a gui (GRUB Customizer) to probe for the new OS and add an entry to GRUB and the MBR -it makes an /etc/grub.d entry then updates GRUB. On startup, the GRUB list contains the new OS (on sda9) but it boots the first OS (which I copied from -sda5). /boot/grub/grub.cfg contains the new debian OS but it looks like this set root='(hd0,msdos9)' search --no-floppy --fs-uuid --set=root 64662470-0e58-4dfd-90ac-43227d773556 linux /boot/vmlinuz-3.2.0-2-amd64 root=UUID=cc3bca0d-aee4-4b9c-95c2-57212cc36d4d ro quiet initrd /boot/initrd.img-3.2.0-2-amd64 the 1st uuid is of sda9, but the 2nd uuid there is of sda5. I can change the 2nd uuid at startup (with E) and it boots sda9. So how can I get grub.cfg corrected so that the sda9 GRUB list entry boots from sda9 permanently?

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• IIS - Script for repeated hacks on a website

  - by dodegaard

  I currently have a site that is armored by ELMAH as its reporting mechanism. Each time someone hits a URL that is incorrect it notifies me or logs to the system. This is annoying for someone fat-fingering the URL with a misspelling but great when a hacker is trying to crack a site of mine. Has anyone ever written a script for IIS 7 on Win 2K8 that blocks an IP based on repeated attempts to hit a website? I've looked at Snort and other IDS systems but if I could get a script that could be linked to my ELMAH system it might be the perfect thing. PowerScript, etc. is what I was thinking. Hints and recommendations are wonderful and if you think a true intrusion detection system is recommended give me your ideas. Thanks in advance.

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• Linux web server shared hosting file errors

  - by dfilkovi

  I'm using a shared hosting to host my website and have some problems with files from time to time. First, one of my file (php) was missing a part of code (nothing to do with hackers just a random piece of code was missing), then after some time a value inside a mysql table was also missing a part, then a whole table column disappeared, after that a whole file on my site disappeared and lastly again some code from a file disappeared, my hosting service says it has nothing to do with them, but this is stupid, how can this happen, no hacker attack could do such a thing, I believe it's some kind of a disk corruption or bad backup. Anyone have any ideas?

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• Need help toubleshooting PC

  - by brux

  I have had problems since my dog pee'd on my computer. Problem: loads windows fine, at random intervals from 5 minutes to 30 minutes it restarts itself. There is nothing in the event log such as errors, no BSOD, just cold restart. after restarting - sometimes- it POST's and restarts itself at the end of POST. It will do this many times and then finally load windows. The cycle then begins again, it will restart eventually. What I have done: I thought it was HDD at first, since this is the only part of the computer which actually got wet with any fluid ( the case is off the PC and the dog pee'd down the front where the HDD is located). Seatool, the seagate HDD tool, found errors when I ran it inside windows, so I ran it in DOS mode from boo-table USB and ran it. It found the same number of errors and fixed them all. I ran the scan again and it says "Good". I loaded windows and ran the scan and it also said "Good there. So the HDD appears to be fine but the problem persists, random restarts. What else could this be? I have taken the computer apart and cleaned everything and also taken the PSU apart and cleaned it thoroughly. The problem still persists, what should my next steps be?

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• I have a perl script that is supposed to run indefinitely. It's being killed... how do I determine who or what kills it?

  - by John O

  I run the perl script in screen (I can log in and check debug output). Nothing in the logic of the script should be capable of killing it quite this dead. I'm one of only two people with access to the server, and the other guy swears that it isn't him (and we both have quite a bit of money riding on it continuing to run without a hitch). I have no reason to believe that some hacker has managed to get a shell or anything like that. I have very little reason to suspect the admins of the host operation (bandwidth/cpu-wise, this script is pretty lightweight). Screen continues to run, but at the end of the output of the perl script I see "Killed" and it has dropped back to a prompt. How do I go about testing what is whacking the damn thing? I've checked crontab, nothing in there that would kill random/non-random processes. Nothing in any of the log files gives any hint. It will run from 2 to 8 hours, it would seem (and on my mac at home, it will run well over 24 hours without a problem). The server is running Ubuntu version something or other, I can look that up if it matters.

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• How can I inject clips [ads] in a playlist every x minutes (even if previous clip is not over)

  - by azera

  Sorry for the title, I find it quite hard to describe what I want to do in a single sentence We have a few TV here linked to our computer, which we use to display clips about what we do in our sport center, what you should do to stay in good form ect ... It's running non stop, actually though vlc + playlist. Those main clips are 1-2 hours long and we have about 20 of them looping randomly all day. We would like to inject ads for some of our sponsiored products every now and then during the playlist, like say one ad every 15 minute. Does any one know how we can do that, while keeping the main clip random order ? I thought about encoding the whole thing as a single movie with ads inserted, but then it's not random. So we can put the ads in the playlist itself right ? Except clips are several hours long and we want that more often than that. Cutting the main clips in several pieces seems to work but that kind of sucks as new clips are made every month. If any one has an idea, thanks a lot

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