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• How to send a popup message to unknow computer connected to my WLAN?

  - by Leandro

  Is there any way to send a popup message from a Linux systen to a "random" laptop/tablet/mobile linked to my Wireless network ? For example, if I let my WLAN open and I see a not recognized computer connected to it, is there anyway to send to that device a message ? On the other hand, if I am connected to someone else open network and they may or may not be aware that their network is open, can I send them a message warning that I am accessing their network? Probably for a completely "random" device the answer should be no. But if we restrict to laptops with Win7 or Linux SO is there any service running by default on such systems that allows one to send such popup messages ? PS: I have no practical motivation for this question. This is only a curiosity.

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• On an unencrypted public wi-fi hotspot, what exactly is a packet sniffer doing to get another computer's packet?

  - by hal10001

  I get mixed results when reading information security articles, some of them stating that in order to do something similar you need to also setup some sort of honeypot with a running access point and local Web server to intercept traffic. Then other articles seem to indicate you don't need that, and you can just run Wireshark, and it will detect all packets being sent on the network. How could that be, and what exactly is a packet sniffer doing to get those packets? Does this involve intercepting wireless signals transmitted over the wireless protocol and frequency via the NIC on the computer running a program like Wireshark?

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• How can I watch TV on my Computer (Not Online)?

  - by Sammy

  Novice question here, but how can I watch TV on my PC without using online sites? I have heard of tv tuners but is it just a matter of hooking a tv tuner to your computer and that's it? Do I have to just buy a tuner or pay for a service as well? If no service needs to be paid for, will I get just regular channels or cable/satellite channels as well? Will my PC need to be connected to the Internet when I want to watch TV? Do I need any type of software aside from the hardware tuner?

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• The session setup from the computer <computerName> failed to authenticate.

  - by TheCodeMonk

  Every once in a while, I get a client PC that won't be able to log into the domain. This morning it was telling us that the trust relationship between the pc and the domain failed. I checked the event logs on the primary domain controller and I see this for 2 PCs (the one that had the problem and one that can log in today). The session setup from the computer failed to authenticate. The name(s) of the account(s) referenced in the security database is . The following error occurred: Access is denied. I know how to fix this, by rejoining the PC to the domain... But why does this happen and how can I prevent it so I don't have to keep rejoining PCs to the domain?

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• Is there an application I can run that will tell me how fast my computer is running?

  - by Robert Hume

  At work I log into a virtual Windows machine. I'm told it runs as fast as a PC, but I'm skeptical. Is there an application I can run on the machine that will tell me how faster the machine is actually running? It would be nice if it ran on Windows and on Mac. Updating with more details -- I was asked "why does it matter" -- here's why: It matters because I'm a programmer and I need as much speed (CPU and memory) as possible to do my work. IMO, the virtual machine is noticeably slower than a basic $800 PC would be, but I need a way a proving it. Websites like Bandwidthtest.com can show me my internet speed, so I'm wondering if there's an app that can test my computer's speed.

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• Could a too low voltage during long periods damage my computer fan?

  - by Sopalajo de Arrierez

  Computer fans use to run at 12Volt, but most as for today they allow 9Volt or even less to slow down the fan speed (RPM, Revolutions Per Minute). In cases of too low voltage, the fan stops, but I can see it "trying to start again". For example: my Tacens 9dB fan stops at about 10 Volts, but to start it again, 10.5Volt is not enough, and the engine tries to move the fan (I can see a small movement as an "attempt" to move) each 1-5 seconds, but it does not succees, so the fan keeps at 0 RPM. Maybe that "attempt" to move could damage the internal engine of the fan when it last for hours or days?

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• The security database on the server does not have a computer account for this workstation trust relationship

  - by alex

  I have a Server 2008 machine called OTTO I recently, by mistake, booted up an old machine, also called OTTO (the hardware was unstable, so the new one was set up to take it's place) I shut down the old machine, turned it off, and recycled it (it won't ever be back on) Now, whenever i try to log in to the real OTTO with the domain account (mydomain\Administrator) i get the following error: The security database on the server does not have a computer account for this workstation What can I do to fix this? It doesn't appear in active directory any more I've added it, but I'm guessing this had no effect, due to a different SID I can log in as the local administrator however

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• Java application crashes my computer. How do I troubleshoot?

  - by Oded

  I am using NetBeans 4.1 for my university course (this is an older version, but is the required version for the course - I can't use a newer version). Whenever I use it for longer than several minutes, my computer crashes - it either reboots or I need to reset it. I have tried running with all startup items disabled (to rule out other applications interfering with the app), but it did no good. I have used Sysinternals procmon logging and the logs are corrupt - the only way I was able to get a good log was by enabling boot logging. However these are huge and I don't know what to look for. I am using Windows XP SP3, fully patched up and this is the only application that I have any kind of problem with. Can anyone suggest troubleshooting steps that will help me pinpoint the cause of these crashes and fix them?

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• Can I upgrade my computer to run SC2 smoothly?

  - by Citizen

  My desktop is: ACPI x86 AMD Athlon x2 Dual Core 3600 1.9ghz 1 gig ram NVIDIA Geforce 7300 I'm running 32 bit windows vista. My budget is ~$250 When I play SC2, its incredibly slow and I have to play with the graphics on the LOWEST settings. What can/should I buy (specifically) to get this to run SC2 smoothly? Are max setting possible? I'm not sure what I can get that will be for sure compatible + will actually do the trick. Or is my computer simply too old?

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• How do you make the computer locked when the monitor is turned off but power not off in Windows Vista?

  - by Anon

  I have a power management setting (set up through the Control Panel) that turns the monitor off after 5 minutes of idling but keeps the power on all time, if the laptop is connected to power. Under this setting, however, the computer doesn't lock itself and becomes vulnerable to any passerby's attempt to log in if I'm not around. Is there any way to force lock in this situation? (I can force lock if I have the laptop go sleep, but for immediate access I'd like to keep the power on when the laptop is connected to power.)

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• How can I use a computer as a router and send all client traffic through anonymous proxies?

  - by Terrapin

  Is there a way that I can setup a spare box as a router on my network, and route client traffic through a proxy in order to hide my location? Specifically, I would like internet traffic to/from my Roku Box to be routed via proxy, but there is no proxy support built in to the Roku. So I would like wire my Roku directly my computer's second NIC, and force all traffic through a proxy. What kind of software and hardware setup will I need? Also, which anonymous proxy service are best for this purpose? I'm not interesting in full anonymity or encryption. I simply want to mask my location while providing the best possible throughput.

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• Wake computer from sleep/standby without BIOS support for WOL?

  - by jjeaton

  Just bought a new home server and the nice folks at HP disabled the Wake-On-Lan feature in my motherboard. Are there any other options for waking the computer from Sleep/Standby mode? I'd like to take advantage of power savings wherever I can. I realize that I won't be able to wake it from shutdown, short of putting together some Rube Goldberg machine. EDIT: I'd like to be able to wake the machine on demand, remotely. So I can then RDP into it, or access files, etc.

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• How to SSH an outside server from a computer which is behind a proxy firewall ?

  - by Karan

  I access the Internet through an HTTP proxy firewall at college. And I need to login to a computer, via SSH, which is outside our network. I tried it as Linux command and on Windows using PuTTY. I also configured PuTTY to use our server's address. But still, "Proxy error: 403 forbidden" pops up. They must've blocked SSH access to outside systems. (college systems as accessible). I can SSH a web server (not the proxy server) at the college, which I use to browse proxy-free by tunneling. Now this server allows to browse restricted sites, but still no SSH. Any workaround, please?

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• What to do if my computer is infected by a virus or a malware?

  - by Gnoupi

  This question comes up frequently, and the suggested solutions are usually the same. This community wiki is an attempt to serve as the definitive answer. I expect our best minds to participate, so we can have a comprehensive reference for this problem. What should I do if my Windows computer seems to be infected with a virus or malware? What are the symptoms of an infection? What should I do after noticing an infection? How can I get rid of it? As this is community wiki, feel free to edit this question to improve it as well.

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• Windows Home Server - Can't log in - A problem is preventing Windows from accurately checking the license for this computer. Error Code: 0x8007007e

  - by 1337ingDisorder

  Subject header pretty much covers it. I have a windows Home Server which can only be accessed through remote desktop. I could log in for ages, but for the past couple weeks I haven't been able to log in. As soon as I enter my username/password and click OK, I get an alert dialog stating the following: "A problem is preventing Windows from accurately checking the license for this computer. Error Code: 0x8007007e" When I click "Ok" (the only option) the dialog closes and my remote session closes. How can I get around this? I've tried powering down the machine and powering it back up. Same results.

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• In which temporary folder on my Windows 7 computer can I find copies of recently watched videos?

  - by verve

  I watched some YouTube videos in the Chrome browser hours ago, but now they have been deleted by YouTube... Is there a folder on my computer where recently watched videos would be stored locally? I want to find and save the videos I had watched earlier but that are now unavailable on YouTube. Is there any way to do this? System: Windows 7. Internet Explorer 8. Chrome is umm...17-something.

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• My fingers are cold when using my computer - solutions?

  - by Kjensen

  This might seem silly, and if there is no good and practical solution... I will live. I am a programmer and sit at a computer 10 hours a day - and even though the rest of me is nice and warm (at least warm), my fingers are cold as ice. Are there some gadgets or tricks to keep your fingers warm while typing/mousing? Gloves do not seem like a good solution, since it hinders the movement of the fingers. I have sometimes put my extra laptop next to the mouse pad, so that it vents hot air on the mouse - and that works... But it is not very practical, plus it only works for one hand (and not very well). Tips?

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• I have my best computer ideas while sitting in church. You? [closed]

  - by Rolnik

  At the risk of posing a subjective question... Where/when are you when you come up with your best ideas? How do you enter that 'zen' state? Yes... necessarily these have to be computer ideas and not new ideas how to make waffles (unless it involves a CPU). Some kinds of ideas include: New software project; better way to organize data; What would look slick on the internet; How to break into the Coka-Cola mainframe and steal the Coke formula (just kidding) How about it. How/when do you get a load of inspiration/insight?

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• How do I install win 7 to dual boot with xp which is already installed on my new computer?

  - by Rustee

  I am building a new computer and have already installed XP Pro on drive 1 partition 1. Drive 1 is a 500 gig SATA with 4 partitions (1 = 50 gig, 2 = 50 gig, 3 =200 gig, 4 = 200 gig). Drive 2 is a 160 gig SATA with 2 patitions (1 = 60 Gig, 2 = 100 gig). I would like to install win 7 on drive 2, partition 1 to dual boot with xp on drive 1, partition 1. As XP is already installed where wanted, is there anything I should know about installing win 7 on drive 2, partition 1 ? Thanks for any and all inputs. Rustee

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• My fingers are cold when using my computer - solutions?

  - by Kjensen

  I am a programmer and sit at a computer ten hours a day - and even though the rest of me is nice and warm, my fingers are as cold as ice. Are there any gadgets or tricks to keep your fingers warm while typing/mousing? Gloves do not seem like a good solution, since it hinders the movement of the fingers. I have sometimes put my extra laptop next to the mouse pad so that it vents hot air on the mouse - and that works. However it is not very practical, plus it only works for one hand (and not very well).

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• On Windows 7, how to Shut Down the computer without the Update?

  - by Jian Lin

  Sometimes when my Win 7 machine has programs that crashed, maybe Firefox, or IE, I would like to shut down the computer without installing any Windows update. That's because I worry that if IE or Firefox crashed, the system is not in a very stable state, so I would rather install the update later. But it seems I only have 2 choices: 1) Shut Down and it always will do any Update 2) Restart, and no update is done (these are 2 choices among the shut down / log off option) So is there a way to Shut Down without doing the Update? Or must I restart first, and then do the Updates, and then Shut Down?

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• How can I retrieve a MS SQL Express Database from a non-booting computer?

  - by Redandwhite

  A client has a very important database that has not been backed up in 6 months. The PC has promptly failed. The Windows directory is corrupt, and the computer will not boot. It had a Microsoft SQL Server Express 2005 database on it. I have access to the hard drive by booting in with an Ubuntu Live CD, but I am not sure if I can find the database. I am not sure what I am looking for, or where to look either. The dead machine had Windows XP on it.

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• How to shut down the computer without the update on Windows 7?

  - by Jian Lin

  Sometimes when my Win 7 machine has programs that crashed, maybe Firefox, or IE, I would like to shut down the computer without installing any Windows update. That's because I worry that if IE or Firefox crashed, the system is not in a very stable state, so I would rather install the update later. But it seems I only have 2 choices: 1) Shut Down and it always will do any Update 2) Restart, and no update is done (these are 2 choices among the shut down / log off option) So is there a way to Shut Down without doing the Update? Or must I restart first, and then do the Updates, and then Shut Down?

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• Can SysPrep (or anything else) be used to make a Win XP partition from another computer bootable?

  - by chris5gd

  I've used Paragon Backup and Recovery Free as recommended to me in my other question, to backup my C: (Win XP) and D: (installed apps) partitions. Before taking the rather scary step of breaking the RAID 0 array on which it's currently installed, and restoring to one of the individual drives, I'd quite like to test the restorability of the imaged partitions. I've restored them on to a spare disk in another computer, which of course won't boot from them in their current state. Is it possible to use SysPrep (or another tool) on the restored partitions, to make it bootable?

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• How to enable a CD/DVD drive? It is not listed in "My Computer"

  - by Senthil

  I just got a laptop from a friend. The CD/DVD drive is not present in "My Computer". But the tray comes out when I press the button and everything. I remember long time ago, enabling it by changing some registry value, but I forgot which one. I have administrator privileges. I can see it in the device manager. But it has a yellow exclamation icon on it. My OS: Windows XP SP3 In Device Manager, inside the properties window for this device, the following error is shown in the "Device Status" box. A driver (service) for this device has been disabled. An alternate driver may be providing this functionality. (Code 32) How do I enable my CD/DVD drive?

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