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• Can't set 1280x1024 on Ubuntu with Nvidia Geforce 8400 GS

  - by torbengb

  Ubuntu doesn't offer 1280x1024 but that's what my monitor has -- I want to set that resolution but need help doing so. Ubuntu offers 1360x768, 1152x864, 1024x768 when using the Nvidia driver version 180. This is Ubuntu 9.04 installed as "Wubi" through Windows, I believe it's the amd64 version. Google gave me this precise explanation which is complete latin to me; I'm a Windows guy and not familiar with Terminal. These SU questions also don't provide answers, hence this new question. I hope you can help, and I will provide additional info if required.

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• Can I use nginx to start EC2 instances on demand?

  - by Gabe Hollombe

  TL;DR - Is there a way to make nginx act as an elastic load balancer that will spin up EC2 instances on demand, allowing for the case when periods of no demand mean no instances will be running? Longer explanation - I have an nginx server that proxy_pass'es requests to a server on EC2. This server doesn't get many requests, so I'd like to keep the server spun down during periods of inactivity (I already have a script to do this). Then, when the instance is spun down and nginx gets a request for that instance, it will time out when trying to get a response from it. At this point, can I somehow trigger a shell command on the server to use EC2's command line tools to spin up the instance, then re-try the user's request after it has started?

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• HTTP/1.1 Status Codes 400 and 417, cannot choose which

  - by TheDeadLike

  I have been referred to here that it might be of better help, I've got a processing file which handles the user sent data, before that, however, it compares the input from client to the expected values to ensure no client-side data change. I can say I don't know lot about HTTP status codes, but I have made up some research on it, and to choose which one is the best for unexpected input handling. So I came up with: 400 Bad Request: The request cannot be fulfilled due to bad syntax 417 Expectation Failed: The server cannot meet the requirements of the Expect request-header field Now, I cannot be really sure which one to use, I have seen 400 Bad Request being used alot, however, whatI get from explanation is that the error is due to an unexistent request rather than an illegal input. On the other side 417 Expectation Failed seems to just fit for my use, however, I have never seen or experimented this header status before. I need your experience and opinions, thanks alot! For a full detailed with form/process page drafts, and my experiments, follow this link.

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• Java 7 update 6 installation fails on Windows 7 when Chrome is default browser

  - by ali1234

  I am configuring a brand new Lenovo U410 system with Windows 7 Home Premium for a user. I received the system direct from the shop. As part of the configuration I installed Java using the online installer. This worked correctly. Later, due to a mistake I made, I needed to restore the system to factory default. The factory default FORMATS C:\ and puts back (supposedly) the exact factory configuration. However, after doing this, I was no longer able to install Java successfully using the same method I used before. Now, whenever I attempt to use the online Java installer, the following happens. First of all, a window always appears "Welcome to Java", "Downloading Java Installer...". After short time this window disappears and then one of three things happens: The very first time I do this after doing a factory reset, I get a Windows error report, which contains this information: Application Name: JavaSetup7u5.exe Application Version: 7.0.50.6 Application Timestamp: 4feacd84 Fault Module Name: JavaIC.dll Fault Module Version: 9.9.9.9 Fault Module Timestamp: 4f2343d6 Exception Offset: 000052cb Exception Code: c0000417 Exception Data: 00000000 OS Version: 6.1.7600.2.0.0.768.3 Locale ID: 1033 Additional Information 1: 773c Additional Information 2: 773cd78cf06816f8246f359fa270f3bb Additional Information 3: f51a Additional Information 4: f51aaea7d22f36fa9e3a626b5a5cd1c3 2. Subsequent runs produce either this error message: "Error: Java(TM) installer - Downloaded file C:\Users\\AppData\Local\Temp\fx-runtime.exe is corrupt." or Nothing happens at all. I Believe this is a red herring. Running the installer again causes a different error because the files were downloaded and the installer crashed before it could clean up. This isn't the actual problem, as when this happens the installer deletes the downloaded files, and then when you run it for the third time, it downloads everything again and does the javaic.dll crash. I suspect the downloader is appending to the existing files or something, causing the corruption. I have tried all of the above as Administrator and as a normal user. I have tried reseting the system to factory defaults several times. I have tried downloading with Chrome and Internet Explorer 9. I have tried uninstalling all anti-virus software and disabling the windows firewall entirely. The only thing which makes a difference is running the installer in Windows XP compatibility mode, which allows the installation to complete. I know I can workaround this error by using the offline installer so please don't post that as an answer. I am looking for an explanation of the root cause. Additionally, if I use the offline installer, the updater does not work. The updater also does not work if I install in XP mode. The updater fails because it works by just downloading the newest online setup and running it. Also remember that the installers are digitally signed. The signitures verify correctly so there is no way in hell that this is caused by corrupted downloads. Some theories I have: The Java setup files on java.com actually changed in between the first successful install and my later attempts. Seems unlikely as none of the version numbers have changed. However, I have seen a couple of reports of this error which showed up in the past 24 hours. This looks like the most likely explanation right now: http://www.oracle.com/us/corporate/press/1735645 - Oracle released 7 update 6 two days ago. Careful inspection of the installers reveal that they are in fact attempting to download .6, not .5 as the download page claims. Not actually correct. Only the update tool tries to install 7u6. The online installer still tries 7u5. However, 7u6 being released two days ago is too much of a coincidence to ignore. Update: The 7u6 online installer is available from Oracle technetwork. It crashes in exactly the same way. The factory reset software uses GMT-8 and I am on GMT-1. As a result, after factory reset, any software which cares to check would think that the system was restored 7 hours in the future, due to Window's awful policy of storing local time in the system clock. This could be confusing a certificate check or similar. Update: I discovered that this does cause Windows Update to fail. The workaround, setting the clock back before starting factory reset, does not enable Java to install correctly. The factory reset image isn't really the same as what is installed in the main partition when you buy the system. Naughty Lenovo. The installer appears to crash while installing or displaying something to do with the Ask.com toolbar. That seems to be what javaic.dll does. Microsoft Tuesday was the 14th. Some update in that could be causing this. However, I'm factory reseting the machine every time, so unless the patches get slipstreamed into the recovery image, or there is some mechanism by which they get silently installed even if updates are disabled, then I don't see how this can be the cause. Major breakthrough: The default browser on Lenovo systems is Google Chrome. I noticed that the JavaIC.dll "sponsor check" actually does a check on your default browser in order to decide which sponsor ad to display. Normally that would get you the Ask toolbar on IE9. But that toolbar doesn't work on Chrome, and so the installer tries to display a different ad. The different ad is what causes the crash. Changing the default browser to IE9 allows the installer to run correctly. So this looks like a genuine bug in the sponsor ad code in the installer, caused by a combination of Google Chrome default browser and not being in the US. (Installer also checks your location using IP geolocation service and displays different ads based on that.)

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• SSLCipherSuite - disable weak encryption, cbc cipher and md5 based algorithm

  - by John

  A developer recently ran a PCI Scan with TripWire against our LAMP server. They identified several issues and instructed the following to correct the issues: Problem: SSL Server Supports Weak Encryption for SSLv3, TLSv1, Solution: Add the following rule to httpd.conf SSLCipherSuite ALL:!aNULL:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM Problem: SSL Server Supports CBC Ciphers for SSLv3, TLSv1 Solution: Disable any cipher suites using CBC ciphers Problem: SSL Server Supports Weak MAC Algorithm for SSLv3, TLSv1 Solution: Disable any cipher suites using MD5 based MAC algorithms I tried searching google for a comprehensive tutorial on how to construct an SSLCipherSuite directive to meet my requirements, but I didn't find anything I could understand. I see examples of SSLCipherSuite directives, but I need an explanation on what each component of the directive does. So even in the directive SSLCipherSuite ALL:!aNULL:!eNULL:!LOW:!EXP:RC4+RSA:+HIGH:+MEDIUM, I dont understand for example what the !LOW means. Can someone either a) tell me the SSLCipherSuite directive that will meet my needs or b) show me a resource that clearly explains each segment of a SSLCipherSuite is and how to construct one?

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• Virtual guest does not have network access in cafe.

  - by blee

  My Virtualbox guest OS (Ubuntu on ubuntu host) does not connect to the internet when I have wifi access through an internet cafe system. By this, I mean where your browser redirects to an internal web page where you can enter a code. On the guest, I can successfully connect to the virtual network adapter, but I do not get internet access, nor a redirect to the internal web page. I use OpenDNS for the host. I have no problems when connecting through ethernet or regular wifi. Can someone tell me any of: 1) How to fix the problem. 2) How such cafe systems work. 3) At least point me to a technical explanation of such a cafe system so I can begin to troubleshoot. Thanks!

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• How to convert an image to a .dwg file

  - by erikric

  My girlfriend is making an art project where she is having an image printed and cut out on a metal plate. The firm responsible for doing this is demanding a .dwg file (and something called polyline; some sort of setting maybe?). Neither of us have heard about this file format, and I find the information about it quite confusing. Most pages seem to link to some schetchy "FooToBarConverter" software, that I frankly don't trust. Could someone please enlighten us on what we need to do, or point to some safe and preferably free software that could do this? (An explanation of the dwg format and the polyline thing would also be much appreciated)

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• Netcat server output with multiple greps

  - by Sridhar-Sarnobat

  I'm trying to send some data from my web browser to a txt file on another computer. This works fine: echo 'Done' | nc -l -k -p 8080 | grep "GET" >> request_data.txt Now I want to do some further processing before writing the http request data to my txt file (involving regex maniuplation). But if I try to do something like this nothing is written to the file: echo 'Done' | nc -l -k -p 8080 | grep "GET" | grep "HTTP" >> request_data.txt (for simplicity of explanation I've used another grep instead of say awk) Why does the 2nd grep not get any data from the output of the first grep? I'm guessing piping with netcat works differently to what I've assumed to get this far. How do I perform a 2nd grep before writing to my txt file? My debugging so far suggests: It is nothing to do with stderr vs stdout Parentheses don't help

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• Freezing of computer while watching flash videos (contd)

  - by t3st

  I have asked this similar question Computer freezing while watching Flash videos from net two week before. As i mentioned in my previous problem my computer freezes while watching online videos showing 100% cpu usage. I have tried the suggestions given in that query and I have formated my whole computer and installed windows and other softwares (with latest updates) but the problem still presisting. If i watch a video online approximately after one hour my system shows very high cpu usage and when i close my browser cpu usage comes to normal(i tried to watch Cybergeddon but my computer is freezing from start,and also other youtube videos). Can you tell me whether its an hardware problem? if yes can you give any possible explanation( eg:motherboard problem,over heating etc) because i want to tell those reasons to my computer mechanic.

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• What is the best way to configure Apache or AWS to support a Rails multi tenancy application that allows each customer to have their own domain name?

  - by Ryan Arneson

  I'm building a Rails 3 SaaS site that allows for multi-tenancy. When a customer signs up they put in their own domain name, e.g. example.com. I need example.com to point to my SaaS application and serve them their content. My questions are as follows: Do I need to create an Apache vhost for each customer using their own domain? Is there an easier way with CNAME's to just have the customer point to the IP address of my server(s) that then forwards the request onto my application through some catch all vhost? Would I be able to create the CNAME record for the customer so they don't have to do any setup? Would this be a case better suited to Amazon Web Services? Any help or explanation or corrections on my understanding of dns would be appreciated. I'm a developer so the server ops portion of this is a bit cloudy.

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• CentOS Vulnerabilities - Exploits/Payloads

  - by Joao Heleno

  Greetings. I'm doing an academic work where I have to find vulnerabilities in CentOS and show how to take advantage of those same vulnerabilities. I'm no hacker and I'm finding this task to be of great difficulty, that is, I see all the security alerts and their descriptions but no explanation of how to take advantage. Maybe I'm being a little naive but all I want to know is if there is any tool I can use to show that CentOS 5.0 vulnerability XPTO exists and to show it "working". If possible something like CVE-2007-0001 exploit tool, CVE-2007-0002 payload and so on. Thanks.

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• Hard Disk Space Changes

  - by Write.

  I am currently running on Windows 7 x64, and have observe that my hard disk space is acting a little weird. Currently, my harddisk has 3 partitions, C:, D:, E:. Previously, before I delete a huge folder (30gb of data) from my D: drive, my C: drive has about 1gb left, while my E: drive has about 5 gb left. After deleting the 30gb of data (from D: drive), my space in D: drive has been recovered (but not sure if it's fully recovered), my C: drive which only had about 1gb left increased to 3. While my E: drive which had 5gb left dropped to 1. I was wondering if it has something to do with the fragmentations and whatsoever I always hear about in harddisk. Has anyone encountered similar issues or have an explanation to why it could be happening?

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• How to gain admin privileges on D-Link router if my isp is not allowing me to do so?

  - by Fischer

  So I switched to new ISP yesterday, they gave me a D-Link router, can't use my old router. I want to change the wireless password, went to 192.168.1.1, I can login with the the username and password user user, but not as admin. On the catalog it says that the default username and password are admin admin, tried that didn't work. Tried admin and no pass, tried many combinations, none worked. I asked some other users and they said that the isp is blocking the users from logging in as admins, and blocking the reset button, and said that there's a hack where you do something like: cmd telnet "router ip" and do something like dumpcfg. Could you please give a better explanation on how to gain admin privileges on your own router if your isp is not letting you do so by default?

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• Carbonite has taken over my iMac

  - by Larry Rothfork

  I used Carbonite to back up 75GB on my iMac. I also created a folder on my iMac to copy files to, from an external hard drive and then use Carbonite to back up from there. And THEN thinking I had everything safely backed up and, in order to make room on my hard drive I DELETED some of those files, and instead of increasing disk space..my disk space has shrunk to 2GB... I know, I know..you can't use Carbonite like that, but now I have two questions. 1) What is the explanation for the decrease in disk space even though I have deleted about 20GB of those backed up files from my hard drive? It must have something to do with the way Carbonite references backed up files, And 2) Is there a way to extricate myself from this situation?

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• Carbonite has taken over my iMac

  - by Larry Rothfork

  I used Carbonite to back up 75GB on my iMac. I also created a folder on my iMac to copy files to, from an external hard drive and then use Carbonite to back up from there. And THEN thinking I had everything safely backed up and, in order to make room on my hard drive I DELETED some of those files, and instead of increasing disk space..my disk space has shrunk to 2GB... I know, I know..you can't use Carbonite like that, but now I have two questions. 1) What is the explanation for the decrease in disk space even though I have deleted about 20GB of those backed up files from my hard drive? It must have something to do with the way Carbonite references backed up files, And 2) Is there a way to extricate myself from this situation?

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• Change Ubuntu 11 scrollbars back to the old style

  - by EMP

  The question: I've installed Ubuntu 11.04 and the new scrollbars in Nautilus, GEdit, etc. are driving me insane! How do I go back to the old (Ubuntu 10.10 and earlier) scrollbars? The explanation (for those who haven't upgraded yet): In the Natty Nautilus you can't actually see a scrollbar normally. Instead you mouse over to where it should be (to the left of the border) and then it appears, but it doesn't appear under the mouse pointer! Instead it appears to the side (to the right of the border), so starting to scroll is now a fairly involved mouse manoeuvre. I don't know what UX genius came up with this, but I want none of it.

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• Extract data from specific range of cells in multiple worksheet in multiple files.

  - by Michele

  Extract data from specific range of cells(always the same cells) in multiple worksheet in multiple files. 1 file=1 day. I have 6 technicians each day of the week, Monday thru Friday. So, 5 files with 6 worksheets. I have entered specific info in specific cells of every work sheet. The range is constant(the same address in EVERY worksheet in every file.) So, I need a formula to extract and calculate the data in the given range and dump it into another spreadsheet. I can forward an example a file if it will help anyone to answer my question. Or more explanation if necessary is available upon request. JUST PLEASE SOMEBODY HELP ME!!!!! Thank you all in advance. Regards, Michele

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• rsync to windows (cygwin)

  - by abergmeier

  We have a windows file storage (don't ask) and now I want to rsync with the machine from Windows, Mac and Linux. So I installed freeSSHd (login shell is set to C:/cygwin64/bin/sh.exe), set up certificates and testing from Linux the test.dat has 0 bytes: ssh myuser@winmachinename "C:/cygwin64/bin/true.exe" > test.dat Even double checking with actual output works fine: ssh myuser@winmachinename "C:/cygwin64/bin/ls.exe" > test.dat Now, when I call rsync: rsync --progress -avz -e ssh myuser@winmachinename:/c/Users ~/test it fails with: protocol version mismatch -- is your shell clean? (see the rsync man page for an explanation) rsync error: protocol incompatibility (code 2) at compat.c(174) [Receiver=3.1.0] As far as reading the docs, this should not happen, when the first test is successful!? I am by now out of ideas - any recommendations how to debug this? EDIT: | OS | rsync version | |:--------------|:------------------------------------------| | Windows | rsync version 3.0.9 protocol version 30 | | Linux | rsync version 3.1.0 protocol version 31 |

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• Can my email address be revoked? [closed]

  - by Name

  I did some work with an organization and had a falling out, so I left them. They used postfix to have [email protected], and I had one. I set up gmail to get my mail via POP as well as to "send mail as @_.com". I think for a long time they forgot to delete my email address and now it seems that I can send but not receive mail at the address. What could a possible explanation for this be? Can they revoke delivery but not sending from the address? Why would they only revoke one if they cna revoke both? Is it more tedious or difficult a task to revoke sending? Thanks

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• Short USB cables not charging?

  - by tropolite

  I find this a strange problem but I can't find anything online about it. Recently I purchased a few short USB cables (20-30cm), to use in my car's USB connector to charge my phone. Strangely an older longer USB cable (1.2m), charges the phone fine (and the icon changes to show charging). With any of the short cables in the same USB slot no charging happens. Both the long and the short cables are USB2 compatible. I naturally assumed the short cables were faulty but connecting them to a PC or connecting to a high capacity external battery charging is successful using all the short cables and longer cables. Hopefully someone here is able to give me an explanation of the problem and how I can overcome this and use a short cable where it is most appropriate. Thanks

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• Is it possible to redirect/bounce TCP traffic to external destination, base on rules?

  - by xfx

  I'm not even sure if this is possible... Also, please forgive my ignorance on the subject. What I'm looking for is for "something" that would allow me to redirect all TCP traffic arriving to host A to host B, but based on some rules. Say host A (the intermediary) receives a request (say a simple HTTP request) from a host with domain X. In that case, it lets it pass through and it's handled by host A itself. Now, let's suppose that host A receives another HTTP request from a host with domain Y, but this time, due to some customizable rules, host A redirects all the traffic to host B, and host B is able to handle it as if came directly from domain Y. And, at this point, both host B and the host with domain Y are able to freely communicate (of course, thought host A). NOTE: All these hosts are on the Internet, not inside a LAN. Please, let me know if the explanation is not clear enough.

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• Virus sending phishing emails through exchange server

  - by therulebookman

  It appears that there is a virus on my network somewhere that is sending phishing emails through my exchange server. I can see the messages in message tracking and I see many SMTP errors for NDR's and rejected connections from external servers, but I do not see any SMTP authentications and I have logging up to MAX. How can I find the IP or hostname of the PC that is infected? Or is there some other explanation than virus? Anti-virus scan on server is clean. Server is not an open relay. Thanks

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• Dual boot Windows 7 with Windows 8- Dynamic Disk

  - by MeetM

  Its a long explanation. I have a HP Pavilion dm4 notebook. It has pre installed Windows 7 Home Pre. Recently, I tried to install Windows 8 developer preview on my notebook, but while installing, it only allowed me to insatll it on my primary Windows 7 drive I.e. drive C. I had kept 1 empty partition for Windows 8 but when I selectced that option, the next button at the bottom of the window just grey with some error saying Windows cannot boot from this drive....blah blah blah So I googled and found another way of doing it by VHD(virtual hard disk). This seemed to work but on restarting gave me "VHD_BOOT_INITIALIZATION_FAILED" error. After trying all possible ways for around 10 times, I gave up. I noticed that d only thing difference in d tutorials and my notebook is the Disk type. They all had Basic and I have Dynamic. Is that the reason m not able to boot Windows 8? Any suggestions?

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• How do I backup Credentials Manager passwords (Windows 7)

  - by Andrew J. Brehm

  I am trying to create a backup of my stored passwords in Credentials Manager. But after Windows switches to the secure desktop to get the password for the backup file it simply announced that "Your stored logon credentials could not be backed up" and gives as explanation "Element not found", neither of which is helpful. (In fact I hate the "X could not Y" type of error message). I am an administrator on the machine and there is only one password in Credentials Manager. The sole point of the backup is to create a nearly empty Credentials Manager so that I don't have to delete manually hundreds of password entries every time I have to change my domain password. (I think Microsoft haven't throught this through properly. There appears to be no way to delete more than one entry at a time.) Any ideas?

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• How do you explain more advanced computing concepts to a non super user?

  - by EvilChookie

  I often have to explain computing concepts to non super users, and I often do it by relating computing concepts to real life situations. I wouldn't mind seeing how other super users do it, and some really good explanations might come in handy instead of me having to wing it. So, how do you explain advanced computing topics to the 'normal' people? Notes: One explanation per answer, and let the best float to the top. CW turned on, since this is subjective. Also, feel free to edit my tags if you can think of better ones =)

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