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• Permissions for Multiple User VPS

  - by adnymarc

  I have a Linode VPS server that I have recently setup and am migrating to from Mediatemple, where I have a VPS managed by Plesk. I dislike the Plesk interface and the mess it makes of a lot of things, but appreciated its ability to allow multiple people access to different domains on a server. I have most everything setup the way I would like it, but am having issues with permissions for my domain directories. I am running Ubuntu 8.04 LTS and Apache 2 as my web server. I have domains successfully located in /var/www/vhosts/domainname.com but have to modify files as root in order to add/change files for the domains. I would like to setup access with the following criteria: Each domain can have a user assigned to it (and allow for the same user to manage multiple domains - could even create symlinks in their home folder to their domains) Certain users will have shell access and may be chrooted to the domain directory they control FTP needs to be setup and able to correctly access the domains so that content editors for each domain can upload/download without permissions issues I am relatively new to linux sysadmin and have searched for a good guide to help solve these issues but haven't been able to find one yet. Thanks in advance for your help.

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• I have to manually change the DNS suffix order every time I connect to VPN. Can I change this permanently or fix the problem somehow?

  - by CarlB

  Sorry in advance but I'm a programmer, not a network engineer, so I'm a noob at this stuff. Anyway, when I am not connected to VPN from my work PC at home, I have the following DNS suffixes listed (real domain names substituted): enterprise.org network.org company.com us.enterprise.org After connecting to VPN, one more DNS suffix is added to the very top of the list: problem-domain.com At this point, most network functions that I can normally perform when actually connected to the LAN in the office are unusable. I get error messages about the network paths not being found and what-not. Anyway, I played around with the suffixes and realized that if I just moved problem-domain.com down one spot to the second in the list, all the problems went away. Unfortunately, it returns to the top spot every time I reconnect, and I tend to get disconnected frequently. Is there something else I can do about this or should I just contact the IT department? I've had this problem before and they weren't able to resolve it but I suppose it would be worth trying again if I could get a different person on the job. What I don't understand is that I thought it didn't matter what order the suffixes were in? Isn't Windows supposed to go through each suffix until it finds a match (or has gone through all the suffixes)? Why is it quitting after the first one? Thanks in advance.

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• Variable host IP address in iptables rule

  - by DrakeES

  I am running CentOS 6.4 with OpenVZ on my laptop. In order to provide Internet access for the VEs I have to apply the following rule on the laptop: iptables -t nat -A POSTROUTING -j SNAT --to-source <LAPTOP_IP> It works fine. However, I have to work in different places - office, home, partner's office etc. The IP of my laptop is different in those places, so have to alter the rule above each time I change place. I have created a workaround which basically determines the IP and applies the rule: #!/bin/bash IP=$(ifconfig | awk -F':' '/inet addr/&&!/127.0.0.1/{split($2,_," ");print _[1]}') iptables -t nat -A POSTROUTING -j SNAT --to-source $IP The workaround above works. I only still have to execute it manually. Perhaps I could make it a hook executing whenever my laptop obtains an IP address from DHCP - how can I do that? Also, I am just wondering if there is an elegant way of getting it done in the first place - iptables? Maybe there is a syntax allowing to specify "current hardware ip addres" in the rule?

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• Noob with git repository on Windows Storage Server 2008?

  - by HibbyHoo

  I have a Western Digital Sentinel at home running Windows Storage Server 2008 R2 Essentials. I have several git repositories on it for my own personal projects, and have no problem pushing and pulling over my local network. I want to be able to access those repos remotely from anywhere. I am able to log in and remotely access folders and files on it, but I cannot clone repos using the same address. It hangs for a REALLY long time before finally failing with an error: git.exe clone --progress -v "https://myIpAddressHere/Remote/fs/files.aspx?path=%5C%5Cmydevicename%5Cmyreposfolder%5Cmyrepo.git" "D:\repo" Cloning into 'D:\repo'... error: Failed connect to myIpAddress:443; No error while accessing https://myIpAddress/Remote/fs/files.aspx?path=%5C%5Cmydevicename%5Cmyreposfolder%5Cmyrepo.git/info/refs fatal: HTTP request failed git did not exit cleanly (exit code 128) I'm not too privy to networking or web development, and I have only a rudimentary understanding of how to use git (with TortoiseGit). I'm having a hard time finding search results for this specific problem and a hard time interpreting generic tutorials for the general scope of this problem. TortoiseGit version: 1.7.13.0. git version: 1.7.10.mysysgit.1.

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• How to train users converting from PC to Mac/Apple at a small non profit?

  - by Everette Mills

  Background: I am part of a team that provides volunteer tech support to a local non profit. We are in the position to obtain a grant to update almost all of our computers (many of them 5 to 7 year old machines running XP), provide laptops for users that need them, etc. We are considering switching our users from PC (WinXP) to Macs. The technical aspects of switching will not be an issue for the team. We are in the process of planning data conversions, machine setup, server changes, etc regardless of whether we switch to Macs or much newer PCs. About 1/4 of the staff uses or has access to a Mac at home, these users already understand the basics of using the equipment. We have another set of (generally younger) users that are technically savvy and while slightly inconvenienced and slowed for a few days should be able to switch over quickly. Finally, several members of the staff are older and have many issues using there computers today. We think in the long run switching to Macs may provide a better user experience, fewer IT headaches, and more effective use of computers. The questions we have is what resources and training (webpages, Books, online training materials or online courses) do you recommend that we provide to users to enable the switchover to happen smoothly. Especially, with a focus on providing different levels of training and support to users with different skill levels. If you have done this in your own organization, what steps were successful, what areas were less successful?

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• Cheated!! Please help

  - by Rohit K

  I was experiencing some hard disk problem with my HP laptop. It showed at bootup as system diagnostics are run -- Smart Drive attribute failed. Also i repeatedly got a warning for imminent hard drive failure and thus to back up my data. So i gave my laptop to authorized HP service center for repair. They formatted my hard disk and installed a pirated copy of Win 7 Ultimate (i earlier had genuine Win 7 Home Premium running on my laptop) and they told me they cover out-of-warranty issues and even charged me for it. What's worse is that the hard drive problem is still present and all i am left with is an illegal copy of windows which i think also voids my warranty. What should i do? I mean i did purchase a genuine Windows with my laptop, so there must be some way to reinstall it even when i don't have a genuine copy now on my machine. Can't i get legit keys to reinstall Win 7 from Microsoft because i did pay for the software when i purchased my machine. And if that's not possible, how can i claim warranty and get my hard disk replaced by HP?

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• Older monitor not working with HDMI to DVI cable (from ultrabook)

  - by ShellfishGene

  I have a Lenovo Yoga ultrabook which only has a HDMI port. I bought an HDMI to DVI cable, and it works as expected with a LG monitor in my office. As soon as I plug it in the screen is cloned. At home I have an older Dell UltraSharp 2005fp, and for that one it does not work. When I plug the cable in "something" happens, the monitor goes from the "no signal" screen to black. On the laptop however nothing happens. In the Windows 8 display setup I don't have another monitor, clicking "detect" does not find one either. I can manually set a second display for cloning or extending, but never get a picture on the Dell. Connecting my media player thing with the cable to the Dell monitor works for when the player displays it's logo at a low resolution, but when it goes into 750p mode after booting the picture also goes away. Mabye that's due to HDCP though. Any ideas? Something to do with Windows 8, or DVI versions?

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• Will the removal of NAT (with the use of IPv6) be bad for consumers? [closed]

  - by Jonathan.

  Possible Duplicate: How will IPv6 impact everyday users? (World IPv6 Day) As I understand when we have finally made the switch to IPv6 not only will NAT be unnecessary but it is incompatible with IPv6? Will that mean that ISPs will have to serve multiple IP addresses per customer? Will they provide a range of addresses for each customer or as each device connects will they get an IP address that isn't necessarily near that of the other devices in their house? But overall will this be bad for the Internet users? as surely it will allow ISPs to see exactly how many devices are being used, and so allow them to charge for the use of additional IP addresses? And then if that happens, what happens when you try to connect an extra device to your network? Will it simply not get an IP address? In my home we have about 15-20 devices connected at once, but for places where there are hundreds of devices, it seems like the perfect opportunity for ISPs to charge more? I think I may have it completely wrong, so is there somewhere where there is an explanation of who things will work when IPv6 becomes the norm?

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• Routing Traffic With OpenVPN

  - by user224277

  Few minutes ago i configured my VPN server, and actually I can connect to my VPN but all trafic is going through my normal home network. On my OpenVPN application I've got an information : Server IP: **.185.***.*10 Client IP: 10.8.0.6 Traffic: 7.3 KB in, 5.6 KB out Connected: 10 June 2014 19:21:59 So everything is connected but how I can setup on windows 7 that all trafic have to go through OpenVPN network card ?? Client setting : client dev tun proto udp # enter the server's hostname # or IP address here, and port number remote **.185.***.*10 1194 resolv-retry infinite nobind persist-key persist-tun # Use the full filepaths to your # certificates and keys ca ca.crt cert user1.crt key user1.key ns-cert-type server comp-lzo verb 6 Server setting : port 1194 proto udp dev tun # the full paths to your server keys and certs ca /etc/openvpn/keys/ca.crt cert /etc/openvpn/keys/server.crt key /etc/openvpn/keys/server.key dh /etc/openvpn/keys/dh2048.pem cipher BF-CBC # Set server mode, and define a virtual pool of IP # addresses for clients to use. Use any subnet # that does not collide with your existing subnets. # In this example, the server can be pinged at 10.8.0.1 server 10.8.0.0 255.255.255.0 # Set up route(s) to subnet(s) behind # OpenVPN server push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" ifconfig-pool-persist /etc/openvpn/ipp.txt keepalive 10 120 status openvpn-status.log verb 6 and sysctl : net.ipv4.ip_forward=1 Thank you for your time and help.

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• Windows 7 system freezes: would like to know if they could be related to MrxSmb, Event ID 8003 errors

  - by lifegoeson

  First, this question centers around a home network. Is it okay to ask here? Or should I go to SuperUser? (I see less answers over there, but I'll go there if that would be more appropriate.) Network setup: 1 Machine running XP Pro 1 Machine running Win7 Ultimate Comcast router Linksys WRT610N Wireless router The Win7 machine goes into a total, unrecoverable system freeze frequently. I was tearing out my hair trying to ascertain a cause, but I noticed that it usually seems to correspond with performing operations on the shared folders on the XP machine. The last 2 occasions that the Win7 machine froze, I saw this entry for Event ID 8003 from source MrxSmb in the Event log of the XP machine: The master browser has received a server announcement from the computer WIN7_COMPUTER that believes that it is the master browser for the domain on transport NetBT_Tcpip_{320B32A7-FED9. The master browser is stopping or an election is being forced. My question is twofold: Could this cause a Win7 system freeze? If so, what could I configure differently on my network to stop these conflicts over who is the master browser? Thank you for your help!

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• where is my disk space?

  - by user166241

  I recently had a problem with .xsession-errors file - it became very big ( 90GB) and took all disk space: How I can check what takes disk space in /tmp?. I cleaned it with command > .xsession-errors but after an hour it became large again. So I deleted it (rm .xsession-errors) - it helped because it wasn't recreated but again after hour disk space disappeared - now there is no .xsession-errors anymore but I don't know where is the memory: df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda1 106640456 101223392 4 100% / udev 8166744 8 8166736 1% /dev tmpfs 3270224 972 3269252 1% /run none 5120 0 5120 0% /run/lock none 8175552 152 8175400 1% /run/shm du -sc * .[^.]* | sort -n 0 initrd.img 0 initrd.img.old 0 proc 0 sys 0 vmlinuz 0 vmlinuz.old 4 cdrom 4 lib64 4 media 4 mnt 4 selinux 8 dev 12 srv 16 lost+found 68 tmp 1124 run 3396 lib32 5164 .rpmdb 5540 root 8888 sbin 9120 bin 17132 etc 106080 opt 116956 boot 861908 lib 3530584 usr 3821836 var 13371260 home 21859112 total So there is around 100GB used but executing du -sc * .[^.]* | sort -n in root directory finds only ~21 GB - so what takes 80GB?? How to check it? I suspect that when I deleted the `.xsession-errors' file the errors were redirected somwhere else - but where?

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• Burning Linux ISO to DVD and making it bootable.

  - by toc777

  Hi everyone, I just downloaded the Fedora 14 Live-Desktop ISO and used CDBurnerXP to burn the image to a DVD. For some reason the first time I burned the image nothing showed up on the DVD when I accessed it even though CDBurnerXP said it had successfully burned to the disk. I did it again and the ISO shows up on the disk (I don't think this is right, should it be the files inside the image that show up on disk or the image file??). The problem now is my dell PC can't find the ISO when I try to boot from it. I get an error saying it can't boot from the CD. I have verified the ISO image as directed from the Fedora website. My question is how do I make a bootable CD from a Fedora Live-Desktop ISO? How can I verify that the ISO was written to the CD correctly and has anyone had any issues booting from a CD using a Dell desktop (I'm not at home at the moment so I can't check what model it is but its old enough, I've had it for about 5 years). EDIT: All that needed to be done was to burn the image to CD as an image and not a data file. The first three times failed, I'm not sure if this was because of faulty DVD's or if the write speed was too high (16x). I put in a new DVD and changed the write speed to 8x, the image was then properly burned to the disk without any errors. Thanks.

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• SSO to multiple websites from Sharepoint website

  - by Aico

  We have an intranet based on Sharepoint 2010. In this intranet we have several links to other webservers within the same Active Directory, for example a link to our Outlook Web Access site on our Exchange 2010 environment. We have three different setups which visit this Sharepoint environment and the other webservers: Windows 7 clients that are a member of the Active Directory Home pc's that connect through a SSL VPN appliance Standalone thin clients (Windows 7 embedded) within the corporate network The goal is to let people only sign in once. In the first group this isn't a problem because the AD Integrated Authentication works fine and the Windows logon is passed on to Sharepoint and the other webservers. The second group is also working fine because of the LDAP integration that the SSL VPN appliance uses. The third group is however experiencing issues. They need to enter their credentials everytime they click a link to another webserver. They first need to enter credentials for accessing the Sharepoint environment. When clicking the link for their webmail they have to re-enter their credentials, and so on. Can someone tell me what the best solution would be to also get SSO working fine for the third group? Some extra information: We also have a Forefront TMG server in our environment. I read somewhere that Forefront might be part of a solution for this problem, but not sure how. Maybe someone here can help me? Look forward to some help. Best regards, Aico

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• Is a modem required to be programmed when using with an internet provider?

  - by Tim

  I wonder if a modem is required to be programmed when using with an internet provider? If yes, what is the purpose of programming a modem? Do both a DSL and a cable ISP both require a modem to be used in an individual home? For example, I have a Motorola modem SURFboard Model:SB5101, Customer S/N: xxx S/N? xxx HFC MAC ID: xxx USB CPE MAC ID: xxx a coil of cable and a splitter from Comcast High-Speed internet Self-Installation Kit, which were bought 5 years ago, when I purchased Comcast internet service from its retailer www.comcastoffers.com. With them, I was hoping to reduce the amount of fee by avoiding to ask Comcast people to come over to install. But I remember at that time Comcast sent its technician here, dismissed my idea of self-installation, saying they needed to use their own modem and charging me a hefty fee, and so my equipments have never been used. I haven't been using Comcast for a long time. I wonder if my modem, cable and splitter (brand new, never used) are still good to use with an internet provider such as Comcast? If needed, we can ignore their policy and just consider the technology side? Or they are not good to use and I must throw them away like trash? Thanks and regards!

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• Get more space for redis in unix server

  - by DevTraveler

  In our app we have only windows servers beside the cases we use redis queues. This case , we use unix server created by amazon. As you can see we do not have a lot of space available and we want to make sure redis has enough space to work without getting stuck. I am little bit new in unix and after reading some data about the unix file system i still was not fully sure how can i give the redis drive (it is in the home directory) more space. I see the mnt that has a lot of space but read it is temporary for cd-rom and network drives. Can you help me figure out how to get more space to my redis ? If it is possible i prefer not to re-install the redis server. Filesystem Size Used Avail Use% Mounted on /dev/xvda1 7.9G 6.7G 880M 89% / udev 7.4G 4.0K 7.4G 1% /dev tmpfs 3.0G 152K 3.0G 1% /run none 5.0M 0 5.0M 0% /run/lock none 7.4G 0 7.4G 0% /run/shm /dev/xvdb 414G 30G 364G 8% /mnt Thanks.

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• Friendly Intranet Addresses

  - by Jmyster

  Relativly new to IIS. I'm attempting to set up multiple sites in my Intranet on one server. The server already has SharePoint Installed on it and has a binding *:80. So when I type //ServerName I get the home page of SharePoint. I get how that works. I set up a new site in IIS and set the Binding to *:30015. On a remote machine if I type //ServerName:30015 in a web browser, I get the new site. Awesome, working as intended. My Questions: Can/How do i set it up so that I can type //DivisionAppName or //Division.AppName and have it resolve itself to //ServerName:30015? Is this something I have to register with my Company's DNS server? I hope not, getting my corprate IT to assist is a nightmare. What I tried: I have added Bindings with the Host Name filled in with both DivisionAppName or Division.AppName and port 30015 but that doesn't seem to work.

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• What can cause two "identical" setups of IE8 and XP to display things differently?

  - by ccornet

  This has been baffling me for a while. Of the machines I use in visitting Stack Overflow, two of them are machines with the same setup: Dell with Windows XP with IE8. Since they were issued to me by the same company (one to use in the office, one to use at home), they have identical setups as well. But they display certain page elements differently! One is an Optiplex GX620 desktop, the other is an Inspiron 9100 laptop, but somehow the hardware doesn't seem like something that should be overriding how my browser displays things. Nevertheless, the laptop seems to display things differently than what is expected. Differences have included the following: This issue persisted on the laptop after Jeff fixed it, but was repaired for everyone else and on the Desktop. When viewing Vote Counts on a post, the grey line is left immediately beneath the upvotes but a number-sized white space is below that before the downvotes. On the desktop, it displays properly with the two adjacent and divided by a grey line. Code blocks seem to have a blank line at the end on the laptop. The following image illustrates how the last two elements look on the laptop. So, considering that as far as I can tell, these two setups are identical (I have not messed with any settings and they were both initialized identically as well), what else could be causing the display difference?

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• Linux Has Become Very Slow Dealing With Large Data

  - by Kohjah Breese

  Last year I bought a computer, for around $1,800, so it is relatively high-end. When I first got it I was particularly pleased at how quick it dealt with large MySQL queries, imports and exports. But somewhere along the way something has gone wrong and I am not sure how to diagnose the problem. Any job that involves processing large amounts of data, e.g. gzipping file c. 1GB+, UPDATEs on large MySQL tables etc. have become very slow. I just performed an intensive alter statement on a 240,000,000 row table on a remote server, which is lower spec. This took about 10 minutes. However, performing the same query on a 167,000,000 row table on my computer went fine until it hit 860MB. Now it is only writing about 1MB every 15 seconds. Does anyone have any advice as to debugging what the issue is? I am using LinuxMint (based on Ubuntu 12.04.) The home partition is encrypted, which really slows down gzip. I have noticed the swap is barely used, but am not sure if that is because there is more than enough RAM. The filesystem is ext4. The MySQL server is on a separate hard drive, but it was fine when I first installed it. Other than the above issues, there are no other problems with it. I am going to install a fresh Ubuntu on the 4th hard drive to see if that is any different.

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• New i7 is slower than old Core 2 Duo? Why? (BIOS programming)

  - by DrChase

  I've always wondered why the companies who make BIOS' either have terrible engineering psychologists or none at all. But without wasting your time further with random speculative questions, my real question is as follows: Why does my new computer run slower than my old computer? Old Computer: Intel Core 2 Duo CPU @ 3.0 Ghz (stock) 4GB OCZ DDR2 800 RAM Wolfdale E8400 mb nVidia GeForce 8600 GT New Computer: Intel Core i7 920 @ ~3.2 Ghz 6 GB OCZ DDR3 1066 RAM EVGA x58 SLI LE motherboard nVidia GeForce GTX 275 Vista x64 Home Premium on both. "Run slower" is defined as: - poorer FPS performance in the same games, applications - takes longer to start up - general desktop usage (checking email, opening up files, running exe's) is noticeably slower At first I thought I must've not set something up in the BIOS or something. But I have no idea how to set anything in the bios except for "Dummy O.C.", which brought me to ~3.2 Ghz. But beyond that I have no idea. I've been reading stuff about "ram timing" and voltages and the like but I really have no idea about that stuff. I'm a psychologist who has a basic understanding in building his own computers, not a computer scientist. Can someone give me some wisdom that might guide me to the reason my new computer is worse than my older one? I'm sorry if this is a bad question, or not appropriate to SO. I'm just pretty frustrated now and you all have helped me in the past so I figured I'd give it a shot. Thanks for your time.

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• When buying hardware, what sites do you trust for information? [closed]

  - by Matt Dawdy

  I won't ask "what laptop should I buy" since the information is likely to change very quickly. However, I am about to buy a laptop, and I honestly don't know where to begin researching this based on my needs. I am hoping that asking about specific sites that do reviews/recommendations that this will still be on topic. I read the 6 guidelines for subjective questions and believe that this question scores favorably. I'm starting a new job in a few weeks, and they want to know what specific laptop to purchase. I'd like to get the most for their money and get a machine that will not need to be replaced in a year. When looking at a site like Dell, it's hard to get a full picture of the performance of a laptop. Does it work with a docking station, and if so, what kinds of video outs are on it? Will it work well when compiling several large projects in .Net? Has anyone had any issues with the machine getting flaky when dragging it from work to home and back all the time? etc. So, if people would enter in their preferred sites they use when researching hardware, and why they prefer that site (x is great for laptop comparisons, y is great for gaming machine reviews, etc) the I hope that this can be a question with valuable answers to others than just myself.

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• Connect from Mac OS X to Windows 7 Desktop

  - by jrn

  I am trying to connect from my MacBook to my Windows 7 machine within my own network - if it will work from outside my network that's a plus but no need to have. My Windows 7 machine is freshly installed with Windows 7 Home Premium. It runs the built-in firewall with no settings changed so far as well as Microsoft Security Essentials. So far I tried CoRD and Microsofts Remote Desktop Connections to connect from my Mac to my Windows machine without any success. I did try and disabled the firewall on my Windows machine but could not connect either. The reason I did this was to check wether there is a Windows firewall setting preventing me from connecting. On top of that I manually started the Remote Desktop Services and Remote Desktop Configuration within services.msc. Is there anything else I have to enable for a remote desktop connection? Could there be any router setting I have to tweak? Since I do not want to connect from outside my own network I thought I don't have to do any port forwarding. The error messages I retrieve are all connection timeouts. I can however ping the hostname and/or IP address. Any help would be greatly appreciated. Thanks a lot, jrn

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• Windows 7 clean install becomes corrupt after reboot (repeated many fresh installs)

  - by pjotr_dolphin

  My laptop keeps crashing on boot after clean Windows 7 install. Ok, here is the story, and some fact. Computer: Samsung NP900X3C-A04HK (256GB SSD, 8GB RAM) OS to install: Windows 7 Ultimate SP1 (not from Samsung, own fresh Win) I purchased this laptop about a year ago, never booted it into the Windows Home that was installed on it, installed directly Ubuntu on the machine. Full disc encryption was the selected install, so of course it wiped the complete disc (including Samsung Recovery Partition). After some time, I felt like going back to Windows, as Windows 7 is actually quite nice. So I went to buy a fresh Windows 7Ultimate with SP1. Now to the tricky part. Windows installs perfectly, and after installing all Windows updates, drivers from Samsung, software I need, it is time for shutting it down and go to bed. Starting it up again, and it is not booting, these are the type of errors I have gotten so far (fresh installed it more then a dozen times now, and tried different suggestions from threads on the net). Windows failed to start... Status: 0xc000000f Info: The boot selection failed because a required device is inaccessible. File: /boot/bcd Status: 0xc000000f Info: an error occurred while attempting to read the boot configuration data. And some other errors, not all the same. Not memory of this. I have run different disc checks, and all says my SSD is in perfect shape. Note: Soft reboots from Windows menu works, never gets corrupted. But if I Shutdown and then start it up again, this is when it happens. Can someone help me not get back to Ubunut? What can be the cause, and how can it be fixed so I do not get there problems again?

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• computer randomly restarting. both in game and out of game

  - by eric

  first my specs are. AMD Phenom II x4 955 processor 3.2ghz 20gb ddr3 ram 4Gb Nvidia Geforce GTX 770 850w Corsair tx850w psu Gigabyte ud3 mobo Windows 7 professional I recently uprgraded my vid card to gtx770 and upgraded my psu to the 850w thats in it now. i did a reformat with the installation of the new gpu and psu and started fresh and only have a couple programs installed (diablo3, nvidia control panel, wow, and steam). all drivers are up to date and everything is hooked up correctly. the problem is it will randomly shut down. no blue screen. just turns itself straight off and reboots after a couple seconds. occasionally i will have to unplug the power cable from the psu for a few minutes then reconnect and it will start up. it seems pretty random. sometimes it does it when my pc is just sitting there on the home screen. and sometimes it does it during games. and sometimes it doesnt do it for days at a time. i noticed the psu felt hot so i put an extra fan blowing straight onto both the psu and gpu and neither feel overly hot after it shuts down now. could it just be that it is a psu problem. the psu was taken from another machine but wasnt having this problem in that machine. i have seen a few articles online about gtx770 doing the same thing. but i havent found any answers or solutions. any help will be appreciated. im sure the 850w is enough to power my machine, im just stumped and ran out of ideas to fix it. i have even returned the video card for another thinking it might have been an issue with that particular card, but still gettin the same problem.

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• Computer makes odd noise. Replace almost every component. Computer still makes odd noise.

  - by ShimmerGeek

  My PC was getting pretty old, 5 years or so, and over the course of it's life I replaced the graphics card, HDD and a couple of sticks of RAM; but the PSU, processor, motherboard, fans etc. were all original. A few weeks ago, I started hearing an odd noise. I struggle to describe it, it sounded sortof like the 'click of death' you hear when a HDD may fail, but not quite... (And it was far less irregular) Also, I was sure I heard it once or twice a minute or two after I shut down the PC. This was going on very irregularly for a couple weeks. Some days I would hear no noise at all, others I would hear it often, maybe once every 30 seconds or so. I could find no common denominator - i.e. it did not happen more during gaming or any other intensive use. Anyway, I need my PC to sit some classes over the summer, so I put it in for them to run a HDD stress test and to replace a bunch of the components. I ended up replacing almost everything - the only elements I still have are my blu-ray drive and graphics card. They said when they started to run the HDD stress test it failed instantly (They started the test and it immediately said 'Test Complete' so they assumed it was at fault, and put a new HDD in since I was still under warranty with them.) I took it home a few hours ago, and I am still hearing the noise!!! Do you guys have any theories? I'm getting a little worried, I can't afford for my PC to suddenly fail during the next month - I have a lot of coursework to do. Any thoughts? Is it possible it could be the fan on the graphics card? I'm confused because it's so irregular. Any help would be much appreciated.

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• How does the internet protocol handle network card numbers?

  - by Giorgio

  I know that data packets sent over the internet carry the source and destination IP address, so that the protocol can route the data to the correct destination and keep track of the source address of the packet. But what about the network card address? As far as I know, each network card has a unique identification number. Is this also transmitted with a TCP/IP packet? And when a packet is received at its destination, how is the IP address mapped to a network card number? In other words. On the sender part: does the sender store the sender network card number in the IP packets that it is sending? On the receiver part: which component maps the IP address to the receiver's network card number when a packet is received? E.g., in a home network, does the modem / router map the destination IP address of an incoming packet to a network card number and deliver the packet directly to that network card? A link to documentation on these topics would be of great help.

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