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• Apache Request IP Based Security

  - by connec

  I run an Apache server on my home system that I've made available over the internet as I'm not always at my home system. Naturally I don't want all my home server files public, so until now I've simply had: Order allow, deny Deny from all Allow from 127.0.0.1 in my core configuration and just Allow from all in the htaccess of any directories I wanted publicly viewable. However I've decided a better system would be to centralise all the access control and just require authentication (HTTP basic) for requests not to 127.0.0.1/localhost. Is this achievable with Apache/modules? If so how would I go about it? Cheers.

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• JAVA vs .NET Technology - Way 2 go Futher

  - by Sarang

  I have my subject .net acedemically. I also learned core-java and did a project as well. I took training from a java firm. Now, as a skill I do have knowledge as both language. But, it is creating a large problem to me that, which field I should chhose? Even if having better OOP funda, will it be easier for me to transfer from one-another in future ? Please suggest me a way. Also, we do have may technologies available at both side, like JSP, JSF, J2ME, Share Point, SilverLight etc. Which is better as per their reliabity point of view? Which are fast growing and useful technologies used mostly in current IT corporate world ? Are they easier to learn at fresher's point of view? Please answer. Perhaps, this answer may help me mostly to create my way to learn them and go further.

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• Cisco NAC: help with enabling FTP or moving update files

  - by kyoung

  Hi, So this is a LINUX question, and a Cisco NAC question. I'm trying to update our server from 4.1 to 4.7, and i need to move some tarball files to the NAC. the NAC Appliance runs some strange stripped down version of Fedora Core 4 copying the upgrade: The instructions say to FTP the file to the NAC appliance, however whenever i use WinSCP with root credentials, i get a notice informing me the connection was actively refused. I can't for the life of me find any .conf files that sound like winners, so I don't know how to change the settings, however the ftp command does seem to work. what exactly should I do here?

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• Another "Trouble copying music files from HD to 16GB thumb drive"

  - by Ron

  I have a brand new HP Quad Core - 6GB Ram - running 64-bit Windows 7. Running Norton Internet 2010. I try copying music files from HD to 16 GB thumbdrive and get blue screen after a few files have transfered over to thumbdrive. Computer blinks once and boom - blue screen and then reboots. This is really aggravating. I stopped anti-virus, pulled other USB attached devices - still does same thing. Any solutions out there?

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• Dell Inspiron 530 - SSD Worth it?

  - by DrFredEdison

  I'm going to be upgrading my Dell Inspiron 530 (2.0 Ghz Intel Dual Core CPU, 3 GB RAM) to windows 7 soon, and rather than backup and reformat my existing drive, I'm planning on getting a 2nd drive to replace my current primary, and moving it to a secondary. Thus, this seems like an excellent time to get a solid-state drive, if its going to be worth it. As far as I can tell this machine has a SATA-I controller, and I'm unsure if I'll see a noticeable performance increase with an SSD without going to SATA-II. So I have a three part question here given all that: Will spending the money on a SSD be worth it if hook it into a SATA-I controller? Is it reasonable to upgrade the controller on this machine to a SATA-II controller? Given that this PC is kind of old to begin with, am I better off performance wise to just stick with a faster HDD?

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• what to use instead of laptop-mode?

  - by playcat

  hello, i have ubuntu 10.10 64bit on hp 6735s (turion processor). it overheats, and i'm forced to use turion power control in order to keep core temperature to a reasonable level. one more measure that i use is putting my processors to conservative mode. that way, i'm perfectly happy with its performance, and heat is where it should be. however, after my latest upgrade, something happened - cores are back to ondemand by default, and i'm not sure if turionpowercontrol is working any more (ps axu | grep urion shows no process). in addition, i read somewhere that laptop-mode uses hdd spindown for preserving data/energy, and that hdds have only a limited amount of those spindowns, so laptop-mode usage can actually shorten the life of my hdd. i'm wondering if there is a good way to set my cores to automatically go to conservative mode? also, what's the good way to see what is the voltage my cores use? on windows i use cpuz tools. thx and sorry for the long explanation.

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• Raspberry Pi based Hadoop cluster

  - by Dmitriy Sukharev

  Is it at least possible to build Hadoop cluster from Raspberry Pi-based nodes? Can such a cluster meet hardware requirements of Hadoop? And if so, how much Raspberry Pi nodes are required to meet requirements? I understand that a cluster from several Raspberry Pi nodes being cheap is not powerful. My purpose is to organize cluster without possibility of loosing personal data from my desktop or notebook, and to use this cluster studying Hadoop. I'd appreciate if you suggest any better ideas of organizing a cheap Hadoop cluster for studying purposes. UPD: I've seen that recommended amount of memory for Hadoop is 16-24GB, multi-core processors, and 1TB of HDD, but it doesn't look like minimal requirements.

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• Why Java applicaiton is running slow for clients on Linux

  - by Darshani

  We have two linux servers which have Apache Tomcat Installed. One is running the Database, the other is running with Java application. More than 100 users are connected to the servers. Server machines are quad core normal PC's which have 4 GB memory. It was running properly for the last 6 months but the application has recently started to run slowly . Suddenly the Java application is getting stuck & users cannot work for some time. There is no network issue. I am trying to identify the reason for this, whether it is a machine problem or the problem is in the Java application. Can any body help me with this?

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• Will this RAM work well in an iMac?

  - by sala_7

  I want to increase the RAM of my 2.4GHz Intel Core 2 Duo 24" iMac. I currently have 1GB of RAM DDR2 SDRAM 667 MHz. I really want to upgrade, but know nothing about RAM or hardware in general... These are the cards I found: http://www.crucial.com/eu/store/mpartspecs.aspx?mtbpoid=D4B6F603A5CA7304 Are these of quality or should I look at something else? Finally, I have 800MHz of Bus speed, couldn't I get faster RAM? Thanks for taking the time to read, and hoping you take the time to answer.

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• DisplayPort to DVI not working on Quadro FX 580

  - by kaosvid

  I have a PNY NVIDIA Quadro FX 580 graphics card with 1x DVI and 2x DisplayPorts. The DVI port works fine with both my Viewsonic monitors but I cannot get either of the DPs to work using the supplied DP to DVI adapter; all I get is a "no signal" on either monitor when connected to either DP port. The NVIDIA Control Panel shows that the second monitor is not connected when in fact it is. How do I get the second monitor to work? System: Windows XP Professional 32-bit Asus P5Q motherboard Core 2 Duo E8500 CPU 4GB PC8500 RAM

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• Assembling a number-crunching computer [closed]

  - by tugrul büyükisik

  What is needed to make a GPU fully fed by CPU? Comparing their flops/s is enough? For example, if i could manage to make a very old(pentium-3) CPU with one of Nvidia-Fermi GPU, it would not be able to fed the gpu with data per sec. What is the criteria to fit CPU to GPU exactly when OpenCL or some similar work needed? Of course RAM and BUS will be chosen in a similar way but how exactly? Assume each GPU-core will calculate a sqrt and a division and an adding for 100 times for every itearation. Thanks.

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• Is ceph usable with only 100Mbps bandwidth between nodes?

  - by vaab

  I haven't great hardware, but my requirements are low, I would like to start using ceph so as to abstract filesystem location and allow potential easy scaling to bigger hardware in an hypothetical future. My actual hardware meets ceph hardware requirements except the ethernet bandwidth part between the hosts. Mine is 100 Mbit/s which is much lower than the 1Gbps expected in ceph, even from the minimal requirement. Will I be able to use ceph in a very small smili-prod environnement (with limited number of clients) ? FYI: My hardware is 2 or maybe 3 hosts having each 4 core Intel, 24Go RAM, 2x2To disks but 100Mpbs between them.

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• why are CPUs so much more expensive in the UK than US?

  - by Nick Fortescue

  I'm looking at building my own PC. An Intel Core i7 960 3.2 Ghz is about £457 in the UK at various online retailers. In the US the price at newegg is $570 (this is about £380 at current exchange rates). 2 questions. 1) Why the difference (about 20%)? All I can think of is sales tax. 2) Am I right in assuming this is just a commodity part - if I ordered one from the US there is no reason it would be any different from one bought in the UK?

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• Is it safe to compress my Windows 7 %USERPROFILE%\AppData folder?

  - by Kev

  Having just read Scott Hanselman's latest blog entry, Guide to Freeing up Disk Space under Windows 7, he suggests turning on NTFS compression which I already do for a number of less travelled folders that contain static files such as downloads or images. However I am wondering if it's wise to turn on NTFS compression for the whole of my %USERPROFILE%\AppData folder? My system drive is a 128 GB SSD residing in a Dell Precision T5400 3Ghz Quad Core Xeon workstation so I ought not to notice the extra cycles used to compress and decompress files on their way to and from the disk. However would there be any good reasons not to do this? In fact could I safely compress the whole of my %USERPROFILE% folder?

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• Unauthorized access error to html pages in IIS 7.0

  - by George2

  I am using VSTS 2008 + C# + .Net 3.5 + IIS 7.0. I have created a new web site and put an html file into the directory. And when I use browse function in IIS manager to browse the html file, I met with the following error, any ideas what is wrong? BTW: I am very confused about unauthorized error since I run the worker process under administrator account. From the error message, I am confused why the logon method is anonymous and not using administrator account? HTTP Error 401.3 - Unauthorized You do not have permission to view this directory or page because of the access control list (ACL) configuration or encryption settings for this resource on the Web server. Module IIS Web Core Notification AuthenticateRequest Handler StaticFile Error Code 0x80070005 Requested URL http://localhost:80/a.html Physical Path C:\test\simplehosttest\a.html Logon Method Anonymous Logon User Anonymous thanks in advance, George

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• Can't see CMD.EXE on Windows 7

  - by Andrea

  I have a problem with Windows 7 and cmd.exe with these conditions: Logon as non admin user Launch cmd.exe I can see cmd.exe in task manager but it's invisible in the desktop and I don't know what to do, everything is fine and I can see cmd.exe if I do login with an admin account. I can see it in the "Process" tab but not in the "Application" tab, and if I launch five cmd.exe's, I see five processes, but from that tab I have no "Bring to front" or "Maximise" I can't find any WOW folder under C:\Windows, even with show hidden and system files enabled. I'm running Windows 7 32-bit running on a 64-bit Intel Core 2 Duo E7500

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• PC reboots regularly

  - by Bob

  Windows XP RAID 5 drives Intel Dual Core processor 2 GB Ram I am running a processor temperature monitor. It does not appear to be overheating. I do not have virus. The PC freezes and reboots. I do not think it is software related, because it will reboot if it is doing nothing. Could it be the power supply? Might i need to replace it? How do I diagnose this? Is this the kind of question that is appropriate here? I am not sure.

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• Build Advise for Home Web/NAS Server with Ubuntu Server 12.04 [closed]

  - by razor7

  I need to have a personal Webserver with NAS capabilities. The Webserver to test some LAMP projects I develop for clients, and also NAS to be able to stream media to local network. I want to have full control of the box, so I'm planning to build it with some spare parts and Ubuntu Server. The services/software that will run are (remember, is for personal and testing use only): SAMBA/CIFS SSH Server Apache 2 MySQL 5 Mercurial Repo PHP 5.3 Ruby on Rails OwnCloud Dovecot Webmin Postfix PureFTPd ClamAV The Hardware: Intel Dual Core E2180 2.0 GHz MSI P35 Neo Kinkston 1GB DDR2, 667 MSI Nvidia 7300le PCIe x16 256mb RAM HDD SATA WD Green 2TB x2 (RAID-1 with MDADM RAID Controller) 16 GB USB Pendrive (For server system installation) My idea is to build this system, using the pendrive for the Ubuntu Server software, and packages, and the RAID-1 for gross data storage. What do you think? Thanks a lot!

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• Windows freezes, showing a random color or pattern

  - by Manu

  I have a PC with windows 7, and I'm experiencing random freezes with increasing frequency. After some time (from 30 minutes to a few hours) the screen will shows a random color or pattern (vertical lines) and nothing works anymore, I need to reboot manually. I've checked the events log, but nothing is shown except for the unexpected reboot. I've tested the RAM with Memtest86+ 4.20, and the graphics card with FurMark 1.10.3, no errors have been found. I've updated the graphic drivers and openned the case to remove dust, but the issue is still there. Also, the problem doesn't seem to arise when I'm playing games fullscreen, but when I'm surfing the web, using itunes, or coding. My hardware is as follows : intel core i5 750 CPU, ATI Radeon HD 5670 graphics card, ASUSTeK P7P55D motherboard, two 2Gb KINGSTON DDR3 ram sticks, 2 SATA hard drives, a Netgear dongle for wifi.

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• Is virtual machine slower than the underlying physical machine?

  - by Michal Illich

  This question is quite general, but most specifically I'm interested in knowing if virtual machine running Ubuntu Enterprise Cloud will be any slower than the same physical machine without any virtualization. How much (1%, 5%, 10%)? Did anyone measure performance difference of web server or db server (virtual VS physical)? If it depends on configuration, let's imagine two quad core processors, 12 GB of memory and a bunch of SSD disks, running 64-bit ubuntu enterprise server. On top of that, just 1 virtual machine allowed to use all resources available.

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• Windows 7 slowing down during hard drive activity

  - by Iniquities of evil men

  Sometimes when normally using my PC, it will (seemingly) randomly slow down, and maybe sometimes even freeze for several seconds. During this slow down period, it looks like a (I don't know which drive it is) hard drive is constantly being written to. During the last slow down, I started Windows's Ressource Monitor and found out that the System process was writing up to 10MB/s to a drive (I suspect it's the system drive, C:\, but I don't know for sure). I'm not doing anything unusual (at least, I don't think I am), and most of the time, it will work normally, but, as I said, it just randomly slows down for some times. Any ideas on what might be causing this and how I can prevent this from happening again? (I have a triple-core processor and 4GB of RAM. My system drive is a WD Caviar Black 500GB, my secondary, 'data' drive is a Samsung drive, which I don't know the model number of, but I can look it up. I can also post my full PC specs if needed.)

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• If I double my ram on a x86 processor, does that double the ram I can use for each individual process?

  - by Derek Reitz

  I don't understand how 32-Bit OS's use RAM on a per process basis. I've read the max RAM my x86 processor running a 32-bit OS can use is 2^32 = 4gb; but that's just for one process, right? 3DS Max keeps crashing, but it typically can never use more than 2GB of RAM before it crashes, if I increase my RAM from 4-8GB, would that double how much RAM I can use for each individual process or actually cause no change in my performance? Also would increasing my VRAM and getting a better graphics card increase the extent to which individual programs can preform? Lastly, is there any way to upgrade a 86-bit processor to be able to run a 64-bit OS? I feel like it would be ridiculous to sell modern processors that are capped at 4GB of RAM? Thanks. Quad-Core Intel i7 Q 720 @ 1.6GHz

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• SQL Server 2005/2008 Licensing Decision

  - by Hakim

  Hello, I have purchased a dedicated server from a reputable Hosting company. They only have Windows Server 2008 OS installed on it and NO Sql server. Server Configuration is Intel Dual core Processor with 2GB of RAM and 100GB HDD. I wanted to host my web services on that server which will be using the MS SQL Server 2005 at the backend.There are multiple web services and each using a different Database. Microsoft has CAL basis Licensing , Which I understand is based on number of users accessing the database directly ( I may be wrong ) . But my users will be accessing the webservice and no direct connection to the database as such. Yes but the number of users accessing the web server cannot be known and is not under my control. Which Licensing is best suited for this kind of setup ? I don't need analysing and BI services right now ,but i may want to upgrade that in future may be. Any help will be appreciated. Thanks

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• Tomcat Failed to start

  - by user530158

  I have installed Tomcat on windows XP through the Tomcat installer. I have installed JDK 1.6. But when I start Tomacat from services.msi on XP, I get the following error: java.lang.ClassNotFoundException: org.apache.catalina.core.AprLifecycleListener at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at sun.misc.Launcher$ExtClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at org.apache.commons.digester.ObjectCreateRule.begin(ObjectCreateRule.java:204) at org.apache.commons.digester.Rule.begin(Rule.java:152) at org.apache.commons.digester.Digester.startElement(Digester.java:1286) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)

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• RAID 5 heavy IO hard freezes Ubuntu: Why?

  - by Luke has no name

  I have a software RAID 5 partition on LVM in Ubuntu (desktop, actually, but I'm using it as a server). I have been rsyncing a ton of data to it, and the computer was hard freezing, as in I needed to press "Reset". So I thought it was rsync. But I decided I'd try a dd if=/dev/zero of=/path/to/raid5 and sure enough, the computer locked up. Did an identical dd to a JBOD partition on the same machine, and it didn't crash. Assuming a clean RAID5 partition, tri-core processor 2GB of ram, 6GB swap, what could be causing this?

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