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• Option 82 and dhcpd. "No free leases" for second computer

  - by SaveTheRbtz

  There is DHCP server in network (isc-dhcpd-server-3.0 on FreeBSD 7.2) than gives one IP per switch port to every user via Option 82 The problem appears when user disconnects one of his computers and connects another(i.e notebook with different MAC address) then DHCPD puts to log "...network net1: no free leases", because there is record in leases file that this IP is already owned by another MAC. That second computer will have his IP only after default-lease-time (that is IIRC minimum 10min, and after 3min he usually calling support) or after deletion of dhcpd.leases file and restart of dhcpd. Is there a way to turn leases off at all, because we have strict binding between switch-port-ip?

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• How to fix? => Your system administrator does not allow the user of saved credentials to log on to the remote computer

  - by Pure.Krome

  At our office, any of our Windows 7 Clients get this error message when we try and RDP to a remote W2K8 Server outside of the office :- Your system administrator does not allow the user of saved credentials to log on to the remote computer XXX because its identity is not fully verified. Please enter new credentials A quick google search leads to some posts they all suggest I edit group policy, etc. I'm under the impression, that the common fix for this, is to follow those instructions -per Windows7 machine-. Ack :( Is there anyway I can do something via our office Active Directory .. which auto updates all Windows 7 clients in the office LAN?

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• How do you recommend installing Linux on a computer that has no external drive or ability to boot fr

  - by 7777

  I have an old Toshiba Portege 3505 "ultralight" laptop, meaning it doesn't have any kind of disk drive on it at all, that I'd like to completely reformat and install Linux on. However, it won't boot from any drive (and I don't have any on hand), so I'll have to install it from a USB drive (which I doubt it boots from either). (I'm not sure how to change the settings in my BIOS to get my computer to boot from a USB stick. Any ideas for this?) How do you recommend I do this? I want to note that I don't want to run Linux off a LiveUSB, I want to actually install it on the machine. I was thinking about Damn Small Linux, it's tiny and all I need. Any advice or suggestions for something else though? Finally, I'm a total newbie to this, I've never installed Linux on anything before so I might be a little slow on some stuff! Thanks!

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• Is it possible to have a computer run two OS's in memory at the same time?

  - by Hebon

  I'm sick of needing to reboot my computer every time I wish to use another OS, or run a virtual machine that skimps on power. With the onset of large amounts of memory for computers nowadays I began to think that there must be some way to run two OS's in memory with a way to switch between the two. In my mind, it doesn't seem too difficult; a compatibility layer boots up after bios, which in turn boots to OS1. While in OS1, software is run that triggers a save to ram boots back to the compatability layer, and then boots to OS2. This way, the OS's can be used side by side and boot times are cut drastically short since both OSs are already in ram. Both OS's have their own designated and protected memory so there is no problem there... I mean, it seems fine, but no one has done it, so there must be some reason as to why. I would love some insight into this please.

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• How to make a streaming server to stream media from computer to mobile phone in wifi?

  - by zkz

  Usually we have many HD movies in our computer, but we want to see them by our mobile phone. This requirement produces some questions: 1?the HD videos are too big to transfer to phone timely and it it hard to play on phone smoothly, so we have to transform the videos smaller and fit the screen of phone. 2?the coded format of the videos are varied, but limited types are supported by mobile phone, so we should transform the coded format to those supported by mobile phone. I've leaned the streaming media fit this problem, what I want is: 1?are there any good opensource projects fit this(ffmpeg?live555? darwin?)? 2?are they quick enough to transform coded format and transfer to mobile phone to play with no delay? Thank u very much!

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• Google and Yahoo redirect my site to malware, but direct url works fine. Any computer

  - by UserZer0

  I can go directly to the site doublewing.org or www. without issue, but if I click on the link in google or yahoo it redirects to spam sites. Swagbucks works though! This is not on a single computer this happens on systems isolated from each other(Try it, avast blocks it) . The site is runing joomla 1.5.25 . I deleted .htacces, put fresh index.php and index2.php files. and still get the same results. Any ideas?

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

  - by Gnoupi

  This question is coming back often, and the suggested steps are very often the same. In an objective to concentrate useful information in one place, here is a community wiki about it. I expect our best minds to participate in it, so we can have a reference of knowledge, for something like this. What to do if it seems that my computer is infected by a virus, or a malware on a Windows system? What are the symptoms from an infection? What are the steps to follow after noticing an infection? How can I get rid of it? As it is community wiki, feel free to edit this question to improve it as well.

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• How do I activate Window 7 for a different computer?

  - by Abdullah BaMusa

  I bought Windows 7 Professional Retail which I installed on my laptop. Now I've decided to move it to be on my desktop PC, so I uninstalled Windows from my laptop, restoring the original OS came with the laptop (Vista Business), and installed Windows 7 on my desktop PC. The problem is that I cannot activate my copy of Windows 7 on the desktop PC. Every time I try to activate it I get the error message The product key you typed cannot be used to activate windows on this computer" and the code of the error is: Code: 0xc004c008 Description: The activation server determined that the specified product key could not be used. How can I solve this problem?

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• What VNC (or similar) software for Windows 7 Home allows me to control my parents’ computer remotely as an administrator user?

  - by Paul D. Waite

  Here’s what I dream of: I install Windows 7 Home on my parents’ PC. They have a regular user account that they use, meaning they can’t install anything. I have an administrator account, meaning I can install things for them. I install some sort of VNC software on their machine that lets me access their computer remotely under the administrator account, so that I can install software for them (or do other administrator tasks, e.g. updates) without actually going to their house. Is there any VNC or VNC-like software that supports the above? (I guess I might be better off buying them Windows 7 Professional, and using Remote Desktop. At some point I’ll give up and get them an iPad, but for now, remote Windows admin is the dream.)

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• Is it possible to use Logmein to connect to a sleeping (Mac) computer on a wireless network?

  - by jaydles

  I'm using logmein to access my Mac. So I have the local logmein app running on my MacBook Pro, which is on my home wireless network. I access it either from the website (www.logmein.com) or the Logmein Ignition Apps on the iphone or ipad. My problem is that I have to set my MacBook Pro to not sleep at all when plugged in to make this a practical solution, because logmein cant seem to wake it up. I did change the settings in System Preferences to allow "Wake from Lan", but it seems like this won't work with a a Wifi connection. Am I missing anything? Assuming I'm not, is it bad for my computer to basically leave it running and not asleep most of the time?

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• Is it possible to shutdown a remote computer running Windows 7 via Telnet?

  - by Ryan Shripat

  I've successfully connected to my Windows 7 desktop over wifi via Telnet from an XP Home netbook. To login, I use the following command: telnet -l "win7desktop\win7user" win7desktop win7user in this case is an Administrator on win7desktop and is also a member of the Telnet Clients Group. The problem I have is that when I attempt to shut down win7desktop by issuing the following command: shutdown /s ...at the Telnet prompt, I get an Access Denied error: Access is denied.(5) Is it possible to shutdown a remote computer running Windows 7 via Telnet? If so, what do I need to do to get around the Access is denied error?

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• What is the best MTA setup for a home/laptop computer (*not* server)?

  - by thomasrutter

  Hello, What is a good MTA (e.g. Postfix or something else) setup for a home computer behind a NAT, or a laptop that is not always online? I've read a lot of Postfix tutorials on how to set it up this way or that, but they are usually geared towards computers that are servers ie they have a static IP have a domain name are always connected to the same network My requirements are, I guess: Ability to redirect mail for local users to another server of my choosing. No listening for incoming SMTP connections - outgoing only Ability to route outgoing mail via an external SMTP server with authentication (and perhaps encryption) If not Postfix, I need an MTA which can queue up mails in case it temporarily has no internet connection.

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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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• 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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• 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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• 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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• 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 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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• 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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