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• Oracle OpenWorld São Paulo Is Back!

  - by Kristin Rose

  Guess what’s back and bigger than ever! Oracle OpenWorld São Paulo, and we can’t wait to see YOU there! Be part of the first ever Oracle PartnerNetwork Exchange Latin America, a program that incorporates special activities specifically tailored to you, our partners. OracleOpenWorld Latin America is taking place from December 4th – 6th at the Transamerica Expo Center, so if you haven’t already registered, hurry and do so to take advantage of our Early Bird pricing here! This year’s jam-packed agenda includes keynotes from Hugo Freytes, SVP of Latin America Alliances and Channels, Judson Althoff, SVP of Worldwide Alliances and Channels and many more! The OPN Keynote session will take place on December 5th from 10:00am to 12:00am, and the program will feature four tracks including Applications, Cloud, Engineered Systems and Technology for partners, complete with endless content! Click here to view the Oracle OpenWorld Latin America Oracle PartnerNetwork Agenda. Also, we wanted to offer a huge THANK YOU to our 2012 Oracle PartnerNetwork Exchange Latin America and Lounge sponsors: Avnet and Preteco! Be sure to stop by our Oracle PartnerNetwork Lounge to hold meetings, network with your peers, and engage in relevant conversations with your partners, customers and other industry professionals. Finally, don’t wait to register! Early Bird Pricing for OPN Exchange @ OpenWorld has ends November, 23. You really don't want to miss this great opportunity to learn, network, and be a part of the experience. Register here! Welcome to the new Oracle PartnerNetwork Exchange @ OpenWorld Latin America 2012! The OPN Communications Team

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• VMXNET3 nic loses the ability to update ARP table after N hours

  - by Peter

  I have a fedora 18 VM that stops updating the arp table on eth1 after running for a number of hours to days. There are other VMs on the same hypervisor that can access all of the same networks without issue. A tcpdump of the offending NIC shows only ARP broadcasts but no responses. None of the other VMs on the vDS see the ARP broadcasts from the offending NIC. The only way I can currently solve the problem is to reboot the VM and then everything works for a while. I've tried changing the port on the vDS and even flipping the network configurations after I lose eth1's ARP table, but the ARP problem follows eth1 but I can access the machines that were originally on eth1. If I statically add the arp entries for machines on the same subnet I have no problems with connectivity. The Hypervisor is an HP BL49X series with flex-10 network modules. Has anyone seen anything like this before?

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• What the hell was THAT?!?

  - by Massimo

  My system is Windows XP SP3, updated with the latest patches. The PC is connected to a Cisco 877 ADSL router, which does NAT from the internal network to its single static public IP address. There are no forwarded ports, and the router's management console can only be accessed from the inside. I was doing two things: working on a remote office machine via VPN and browsing some web pages on the Cisco web site. The remote network is absolutely safe (it's a lab network, four virtual servers, no publicly accessible services and no users at all; also, none of what I'm going to describe ever happened there). The Cisco web site... well, I suppose is quite safe, too. Suddenly, something happened. Strange popups appears anywhere; programs claiming they're "antimalware", "antispyware" et so on begins autoinstalling; fake Windows Update and Security Center icons pop up in the system tray. svchost.exe began crashing repeatedly. Then, finally, after some minutes of this... BSOD. And, upon rebooting, BSOD again. Even in safe mode. Ok, that was obviously some virus/trojan/whatever. I had to install a new copy of Windows on another partition to clean things up. I found strange executables, services and DLLs almost anywhere. Amongst the other things, user32.dll and ndis.sys had been replaced. A fake software called "Antimalware Doctor" had been installed. There were services with completely random names or even GUIDs (!), and also ones called "IpSect" and "Darkness". There were executable files without an .exe extension. There were even two boot-class drivers, which I'm quite sure are the ones that finally caused the system to crash. A true massacre. Ok, now the questions: What the hell was that?!? It was something more than a simple virus! How did it manage to attack my computer, as I am behind a firewall and was not doing anything even only potentially harmful on the web at the time?

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• WEP authentication suddenly failing in Ubuntu

  - by kellishaver

  I'm running Ubuntu 9.10 and after a recent reboot, I'm now unable to authenticate to wireless networks using WEP encryption. I can connect fine to open networks (no idea about WPA). When trying to connect via WEP, I'm continually prompted for the network key, which I know I have entered correctly (and should have been/is saved in my keyring anyway). Everything had been working fine until the reboot. No updates had been installed or configuration changes made. Hardware-wise, everything looks fine (http://pastebin.org/113777), and the fact that connecting to an open network works just fine leads me to think this is a software issue. I just don't know where to begin fixing it. Any insights would be greatly appreciated.

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• SQL Azure Security: DoS

  - by Herve Roggero

  Since I decided to understand in more depth how SQL Azure works I started to dig into its performance characteristics. So I decided to write an application that allows me to put SQL Azure to the test and compare results with a local SQL Server database. One of the options I added is the ability to issue the same command on multiple threads to get certain performance metrics. That's when I stumbled on an interesting security feature of SQL Azure: its Denial of Service (DoS) detection engine. What this security feature does is that it performs a check on the number of connections being established, and if the rate of connection is too high, SQL Azure blocks all communication from that machine. I am still trying to learn more about this specific feature, but it appears that going to the SQL Azure portal and testing the connection from the portal "resets" the feature and you are allowed to connect again... until you reach the login threashold. In the specific test I was performing, all the logins were successful. I haven't tried to login with an invalid account or password... that will be for next time. On my Linked In group (SQL Server and SQL Azure Security: http://www.linkedin.com/groups?gid=2569994&trk=hb_side_g) Chip Andrews (www.sqlsecurity.com) pointed out that this feature in itself could present an internal threat. In theory, a rogue application could be issuing many login requests from a NATed network, which could potentially prevent any production system from connecting to SQL Azure within the same network. My initial response was that this could indeed be the case. However, while the TCP protocol contains the latest NATed IP address of a machine (which masks the origin of the machine making the SQL request), the TDS protocol itself contains the IP Address of the machine making the initial request; so technically there would be a way for SQL Azure to block only the internal IP address making the rogue requests.  So this warrants further investigation... stay tuned...

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• Useless Plesk Error?

  - by Josh Pennington

  I am trying to determine why Plesk on my server won't start and I have no idea where to even start (since my hosting company appears to not want to help me out). Anyways, the error in my Plesk error_log is as follows: 2010-12-25 21:30:28: (log.c.75) server started 2010-12-25 21:30:28: (network.c.336) SSL: error:00000000:lib(0):func(0):reason(0) 2010-12-25 21:30:28: (log.c.75) server started 2010-12-25 21:30:28: (network.c.336) SSL: error:00000000:lib(0):func(0):reason(0) It leads me to believe its a problem with the SSL on the server but I am not sure what to make of the error. Can someone lead me in the right direction? Thanks Josh Pennington

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• Can't connect to sql server 2008 named instance

  - by hcsrpm

  I have sql server 2005 and 2008 running on a server on my local (and very straightforward) network. Using sql management studio 2008 and visual studio 2008, I can connect over the network to the 2005 instance which is the default instance. I can't connect to the 08 instance (named MC08). I can connect to both when logged in to the server. Remote connections have been enabled for MC08 and dynamic ports is turned off (assigned to port 1045). The sql browser service is running as well. This used to work so I'm not sure what has changed. I can't connect using the IP address either. Nothing unusual in the event log either. Any ideas?

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• Increase Performance of VS 2010 by using a SSD

  - by System.Data

  After searching on the internet for performance improvements when using Visual Studio 2010 with a solid state hard drive, I heard a lot of different opinions. A lot of people said that there isn't really a benefit when using a SSD, but in contrast others said the exact opposite. I am a bit confused with the contrasting opinions and I cannot really make a decision whether buying a SSD would make a difference. What are your experiences with this issue and which SSD did you use?

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• Ethernet card not detected on Ubuntu Server 12.04

  - by Dana

  My onboard ethernet isn't detected after a re-install of Server 12.04. For reasons I won't get into here, I had to put the server's drive into another machine to install Ubuntu, then swap back into the server. So the server starts up fine, except for the "Waiting for network configuration". I read in another article that Server, by default, doesn't handle new mac addresses for hardware changes dynamically, unlike Ubuntu Desktop, but a look at /etc/udev/rules.d/70-persistent-net.rules shows only one ethernet interface. Shouldn't it show both the old, and the new? lspci -vv shows an ethernet interface, so what the heck is going on? I should mention that the onboard LAN is enabled in the BIOS. And I know this isn't important, but all this started when I changed some network configuration settings in webmin before the re-install. It couldn't download any updates, so I tinkered a little. Broke, it, installed FreeNAS, which worked, but I didn't like it, then went back to Ubuntu Server, and now I'm in this pickle. Thanks for any advice!

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• Show Notes: Getting Past the Cloud Hype

  - by Bob Rhubart

  This week’s ArchBeat podcast features an unvarnished bit of conversation culled from a recent virtual meet-up. These meet-ups are informal conversations among architects, many of who have participated in previous ArchBeat programs. There’s no prearranged topic, so the participants talk about whatever is on their minds. The most recent meet-up included Oracle ACE Director Ran Batra, director of cloud computing product development with AT&T, and Daniel Templeton, principal product manager for Oracle Grid Engine, and the man behind Dan T’s GridBlog. The conversation took place at the end of the year – and the end of the decade – a time when most tech publications feature their predictions for the coming year.  I wanted a different spin on that theme, so I asked Ron and Dan to talk about the technologies about which they weren’t all that optimistic.   I found that ten-minute chunk of conversation particularly interesting, so that’s what you’re going to hear this week. Listen Get Social If you have questions or comment for Ron and/or Daniel you can connect via the following: Ron Batra Blog | Twitter | LinkedIn | Oracle Mix | Oracle ACE Profile Daniel Templeton Blog | Twitter | LinkedIn Coming Up Oracle ACE Director Debra Lilley talks about her role in the UKOUG’s development group and that group’s collaboration with Oracle on Oracle Fusion Applications. Dr Frank Munz, author of Middleware and Cloud Computing: Oracle Fusion Middleware on Amazon Web Services and Rackspace Cloud. Stay tuned: http://feeds2.feedburner.com/OtnArch2ArchRSS   del.icio.us Tags: oracle,oracle technology network,archbeat,cloud computing,software architect,podcast Technorati Tags: oracle,oracle technology network,archbeat,cloud computing,software architect,podcast

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• Interesting links week #6

  - by erwin21

  Below a list of interesting links that I found this week: Frontend: Understanding CSS Selectors Javascript: Breaking the Web with hash-bangs HTML5 Peeks, Pokes and Pointers Development: 10 Points to Take Care While Building Links for SEO View State decoder ASP.NET MVC Performance Tips Other: Things to Remember Before Launching a Website Tips and Tricks On How To Become a Presentation Ninja 10 Ways to Simplify Your Workday Interested in more interesting links follow me at twitter http://twitter.com/erwingriekspoor

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• "Account locked out" security event at midnight

  - by Kev

  The last three midnights I've gotten an Event ID 539 in the log...about my own account: Event Type: Failure Audit Event Source: Security Event Category: Logon/Logoff Event ID: 539 Date: 2010-04-26 Time: 12:00:20 AM User: NT AUTHORITY\SYSTEM Computer: SERVERNAME Description: Logon Failure: Reason: Account locked out User Name: MyUser Domain: MYDOMAIN Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: SERVERNAME Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: - Source Port: - It's always within a half minute of midnight. There are no login attempts before it. Right after it (in the same second) there's a success audit entry: Logon attempt using explicit credentials: Logged on user: User Name: SERVERNAME$ Domain: MYDOMAIN Logon ID: (0x0,0x3E7) Logon GUID: - User whose credentials were used: Target User Name: MyUser Target Domain: MYDOMAIN Target Logon GUID: - Target Server Name: servername.mydomain.lan Target Server Info: servername.mydomain.lan Caller Process ID: 2724 Source Network Address: - Source Port: - The process ID was the same on all three of them, so I looked it up, and right now at least it maps to TCP/IP Services (Microsoft). I don't believe I changed any policies or anything on Friday. How should I interpret this?

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• Sonicwall settings for Polycom TFTP

  - by Michael Glenn

  I'm switching our VoIP phones (Polycom 301s and 501s) to our data network. They were previously segmented to their own network. This means disabling the DHCP on the Trixbox (Asterisk) server and configuring the Sonicwall TZ 210 DHCP to indicate that Trixbox is the TFTP server. The Polycom phones are stating "could not contact boot server". All phones are configured to TFTP and were confirmed working when previously using the Trixbox server for DHCP. Trixbox DHCP is now turned off. I've configured options 66(as String), 128(as IP) and 150(as IP) in DHCP and added them to a TFTP Option Group. I've enabled "Allow BOOTP Clients to use Range" for the Dynamic IP range and assigned the Option Group TFTP as the DHCP Generic Option Group. Any idea what I'm missing? Is there a separate tool to inspect the DHCP response to compare Trixbox to the Sonicwall?

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• Virtualbox PXE Boot Failing with a Windows Server 2008 R2 Server

  - by Vbitz

  Some fast help on this would be good, I have been on this problem for 14 hours. In a Virtualbox test environment I have 2 virtual machines networked together using a internal network (no traffic runs though the host, it is all at a software level). One is a fresh client with 512mb of ram and a dual core set-up, the other is the server with 1.5GB of ram and running server 2008 r2. The server is configured as a dns server, dchp server, domain controller and also serves PXE booting though WDS (Windows Deployment Services). Both machines can see each other and I am able to start a network boot. The issue comes at the second to last stage of the pre windows PE install. On TFTP download of boot.sdi it starts it but stops during the boot process.

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• Best Keywords For Craigslist

  I'm not going to state that I am an expert in Craigslist, but I do know a few tricks that will help you to find the best keywords for Craigslist. These keywords are words that people will notice and act on. Craigslist is a very popular website and it is easy to make a posting.

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• Help me a routing server on Windows XP

  - by Lu Lu

  I am developing client/server applications and need to test them on Internet environment. However, I only have one PC without connecting the public internet, so I have a plan to simulate a virtual internet environment on my PC. I think I will install the virtual machines for my purpose, but I can install only one machine because of my slowly PC. At the moment, my PC has 2 machines: the host machine (use Windows XP) & the virtual machine (use Windows Server 2003 Ent). Each machine will have 2 network adapter (host-only & internal), and in 2 network adapters, the internal adapter is private on each machine, and host-only adapters are connected together. With Windows 2003, routing server is ok, but I wonder on Windows XP, are there any routing server product? Please help me. Thanks.

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• autofs mac os x afp not loading as correct user?

  - by Stephen Furlani

  Hello, I am way out of my depth, and I am trying to get all of my nodes on a cluster to mount a drive on my head node. I've got /etc/auto_master and /etc/auto_afp configured according to Apple's "Autofs: Automatically Mounting Network File Shares in Mac OS X" White Paper: /etc/auto_master +auto_master # Use directory service /net -hosts -nobrowse,hidefromfinder,nosuid /home auto_home -nobrowse,hidefromfinder /Network/Servers -fstab /- -static /- auto_afp /etc/auto_afp /Volumes/userA -fstype=afp afp://userA:[email protected]:/ /Volumes/userB -fstype=afp afp://userB:[email protected]:/ I am logged into a compute-node as userA. automount appears to mount both /Volumes/userA and /Volumes/userB to head-node.local:/Users/userA/Documents/ even though I have usernames, passwords, and user-directory specified in the afp url. If I go and login with Finder - it mounts userB appropriately. File sharing and cd/dvd sharing is enabled on all computers involved. Am I doing the right thing, and if so, what did I do wrong? -Stephen

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• Lubuntu: neither shut-down nor restart works

  - by Rantanplan

  aI have a freshly installed Lubuntu 14.04.1 (installed with forcepae option on a laptop with Pentium M processor). The only problem that I have found so far is that I cannot shut-down or restart the laptop. It always continues showing "Lubuntu" and some dots. Pressing Esc it says wait-for-state stop/waiting * Stopping rsync daemon rsync [OK] * Asking all remaining processes to terminate… [OK] * Killing all remaining processes… [fail] ModemManager [597] : <info> Caught signal, shutting down… ModemManager [597] : <info> ModemManager is shut down nm-dispatcher.action: Could not get the system bus. Make sure the message bus daemon is running! Message: Did not receive a reply. Possible causes: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. * Deactivating swap… [OK] * Will now halt The cursor remains blinking but the only way to switch it off is to hold the power-off key pressed for some seconds. I tried sudo shutdown -h now, sudo halt and sudo poweroff resulting in the same problem. I also tried to add acpi=force in GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" in /etc/default/grub and run sudo update-grub; then, using the taskbar's shot-down button lead to a direct stop of the laptop equal to holding the power-off key pressed for some seconds. Next I followed the answer http://askubuntu.com/a/202481/288322. Now, I directly receive some messages during shut-down starting wait-for-state stop/waiting * Stopping rsync daemon rsync [OK] * Asking all remaining processes to terminate… [OK] [ 240.944277] INFO: task kworker/0:2:24: block for more than 120 seconds. [ 240.944461] Tainted: G S 3.13.0-34-generic #60-Ubuntu [ 240.944623] "echo 0 > /proc/sys/kernel/hung_tasks_timeout_secs" disables this message. followed by some more similar lines and then: * Killing all remaining processes… [fail] ModemManager [576] : <info> Caught signal, shutting down… nm-dispatcher.action: Caught signal 15, shutting down... ModemManager [576] : <info> ModemManager is shut down * Deactivating swap… [OK] * Will now halt [ 600.944276] INFO: task kworker/0:2:24: block for more than 120 seconds. [ 600.944458] Tainted: G S 3.13.0-34-generic #60-Ubuntu [ 600.944619] "echo 0 > /proc/sys/kernel/hung_tasks_timeout_secs" disables this message. Then, nothing more was coming during the next 5 minutes. If you know where can I find relevant error information, I will be happy to search for them.

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• Wireless not detected on an hp Pavilion g6 - RT5390PCIe

  - by Earl Larson

  I just bought an HP Pavilion g6 laptop and I installed Natty Narwhal alongside Windows 7. In Windows 7, my WiFi works perfect but in Ubuntu it absolutely (no matter what I do) won't detect my home WiFi network. Here is the output of "lspci": earl@ubuntu:~$ lspci 00:00.0 Host bridge: Advanced Micro Devices [AMD] RS880 Host Bridge 00:01.0 PCI bridge: Advanced Micro Devices [AMD] RS780/RS880 PCI to PCI bridge (int gfx) 00:04.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 0) 00:05.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 1) 00:06.0 PCI bridge: Advanced Micro Devices [AMD] RS780 PCI to PCI bridge (PCIE port 2) 00:11.0 SATA controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode] 00:12.0 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller 00:12.2 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller 00:13.0 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller 00:13.2 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller 00:14.0 SMBus: ATI Technologies Inc SBx00 SMBus Controller (rev 42) 00:14.1 IDE interface: ATI Technologies Inc SB7x0/SB8x0/SB9x0 IDE Controller (rev 40) 00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA) (rev 40) 00:14.3 ISA bridge: ATI Technologies Inc SB7x0/SB8x0/SB9x0 LPC host controller (rev 40) 00:14.4 PCI bridge: ATI Technologies Inc SBx00 PCI to PCI Bridge (rev 40) 00:14.5 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI2 Controller 00:16.0 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB OHCI0 Controller 00:16.2 USB Controller: ATI Technologies Inc SB7x0/SB8x0/SB9x0 USB EHCI Controller 00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor HyperTransport Configuration 00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Address Map 00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor DRAM Controller 00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Miscellaneous Control 00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 10h Processor Link Control 01:05.0 VGA compatible controller: ATI Technologies Inc M880G [Mobility Radeon HD 4200] 01:05.1 Audio device: ATI Technologies Inc RS880 Audio Device [Radeon HD 4200] 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 05) 03:00.0 Network controller: Ralink corp. Device 5390 04:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 5209 (rev 01) earl@ubuntu:~$

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• Running 12.04 as a gateway - resolvconf, dhclient and dnsmasq integration

  - by Adam

  I have a gateway server which is set up originally with Ubuntu desktop 12.04 - perhaps a mistake, I don't know, something to bear in mind. I ripped out network-manager and now want to get resolvconf, dhclient and dnsmasq to play well together. dhclient gets the gateway's eth0 WAN ip address and the ISP DNS name server from the modem. dnsmasq needs to serve dhcp to the rest of the lan on eth1 and acts as a DNS cache both for the lan and for the gateway machine. I also set up iptables as a firewall. Right now, the gateway's /etc/resolv.conf shows only name server = 127.0.0.1 which is correct AFAIK. However I don't think that dhclient is giving dnsmasq the ISP DNS name server nor is dnsmasq picking up the OpenDNS and Google name servers I specified in /etc/network/interfaces - at the moment look-ups, i.e. ping or surfing, don't work unless I manually edit /etc/resolv.conf to put in an upstream name server like 8.8.8.8 So I removed the resolvconf package. Now I'm not getting dhcp on my lan and I'm not able to do DNS look-ups on the host itself - I can surf and ping on the net, but not 127.0.0.1. Where do I go from here? This setup with the config for dhclient and dnsmasq, and the same resolv.conf and hosts files worked on my old debian box.

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• Resealing windows XP stops PXE working

  - by zeocrash

  I'm trying to capture a drive image of a windows xp pro machine. I've gone through the steps and resealed the machine. When i try and network boot the PXE instantly gives the message "PXE-MOF" and ends. I have managed to get network boot to work on this machine whenever XP is not resealed. I have tried Multiple times to get PXE to work after resealing windows, but with no luck. As soon as i unseal it, PXE works every time. I know PXE is supposed to work independent of what's on the hard drive. Is there any way that resealing windows could cause PXE to stop working.

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• How to Tell a Hardware Problem From a Software Problem

  - by Chris Hoffman

  Your computer seems to be malfunctioning — it’s slow, programs are crashing or Windows may be blue-screening. Is your computer’s hardware failing, or does it have a software problem that you can fix on your own? This can actually be a bit tricky to figure out. Hardware problems and software problems can lead to the same symptoms — for example, frequent blue screens of death may be caused by either software or hardware problems. Computer is Slow We’ve all heard the stories — someone’s computer slows down over time because they install too much software that runs at startup or it becomes infected with malware. The person concludes that their computer is slowing down because it’s old, so they replace it. But they’re wrong. If a computer is slowing down, it has a software problem that can be fixed. Hardware problems shouldn’t cause your computer to slow down. There are some rare exceptions to this — perhaps your CPU is overheating and it’s downclocking itself, running slower to stay cooler — but most slowness is caused by software issues. Blue Screens Modern versions of Windows are much more stable than older versions of Windows. When used with reliable hardware with well-programmed drivers, a typical Windows computer shouldn’t blue-screen at all. If you are encountering frequent blue screens of death, there’s a good chance your computer’s hardware is failing. Blue screens could also be caused by badly programmed hardware drivers, however. If you just installed or upgraded hardware drivers and blue screens start, try uninstalling the drivers or using system restore — there may be something wrong with the drivers. If you haven’t done anything with your drivers recently and blue screens start, there’s a very good chance you have a hardware problem. Computer Won’t Boot If your computer won’t boot, you could have either a software problem or a hardware problem. Is Windows attempting to boot and failing part-way through the boot process, or does the computer no longer recognize its hard drive or not power on at all? Consult our guide to troubleshooting boot problems for more information. When Hardware Starts to Fail… Here are some common components that can fail and the problems their failures may cause: Hard Drive: If your hard drive starts failing, files on your hard drive may become corrupted. You may see long delays when you attempt to access files or save to the hard drive. Windows may stop booting entirely. CPU: A failing CPU may result in your computer not booting at all. If the CPU is overheating, your computer may blue-screen when it’s under load — for example, when you’re playing a demanding game or encoding video. RAM: Applications write data to your RAM and use it for short-term storage. If your RAM starts failing, an application may write data to part of the RAM, then later read it back and get an incorrect value. This can result in application crashes, blue screens, and file corruption. Graphics Card: Graphics card problems may result in graphical errors while rendering 3D content or even just while displaying your desktop. If the graphics card is overheating, it may crash your graphics driver or cause your computer to freeze while under load — for example, when playing demanding 3D games. Fans: If any of the fans fail in your computer, components may overheat and you may see the above CPU or graphics card problems. Your computer may also shut itself down abruptly so it doesn’t overheat any further and damage itself. Motherboard: Motherboard problems can be extremely tough to diagnose. You may see occasional blue screens or similar problems. Power Supply: A malfunctioning power supply is also tough to diagnose — it may deliver too much power to a component, damaging it and causing it to malfunction. If the power supply dies completely, your computer won’t power on and nothing will happen when you press the power button. Other common problems — for example, a computer slowing down — are likely to be software problems. It’s also possible that software problems can cause many of the above symptoms — malware that hooks deep into the Windows kernel can cause your computer to blue-screen, for example. The Only Way to Know For Sure We’ve tried to give you some idea of the difference between common software problems and hardware problems with the above examples. But it’s often tough to know for sure, and troubleshooting is usually a trial-and-error process. This is especially true if you have an intermittent problem, such as your computer blue-screening a few times a week. You can try scanning your computer for malware and running System Restore to restore your computer’s system software back to its previous working state, but these aren’t  guaranteed ways to fix software problems. The best way to determine whether the problem you have is a software or hardware one is to bite the bullet and restore your computer’s software back to its default state. That means reinstalling Windows or using the Refresh or reset feature on Windows 8. See whether the problem still persists after you restore its operating system to its default state. If you still see the same problem – for example, if your computer is blue-screening and continues to blue-screen after reinstalling Windows — you know you have a hardware problem and need to have your computer fixed or replaced. If the computer crashes or freezes while reinstalling Windows, you definitely have a hardware problem. Even this isn’t a completely perfect method — for example, you may reinstall Windows and install the same hardware drivers afterwards. If the hardware drivers are badly programmed, the blue-screens may continue. Blue screens of death aren’t as common on Windows these days — if you’re encountering them frequently, you likely have a hardware problem. Most blue screens you encounter will likely be caused by hardware issues. On the other hand, other common complaints like “my computer has slowed down” are easily fixable software problems. When in doubt, back up your files and reinstall Windows. Image Credit: Anders Sandberg on Flickr, comedy_nose on Flickr     

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• Can't complete dropbox installation from behind proxy

  - by Mark Jones

  Problem: My PC on campus sits behind a proxy (requiring authentication) and I can't setup Dropbox. I am convinced that this is a proxy issue as I can't setup Ubuntu one either (but I don't use Ubuntu One so that is not a problem). I have looked at the Ubuntu One fix but it seems to be to modify settings explicitly related to Ubuntu One. I can install the nautilus-dropbox package (compiled from source and from .deb package from website and from software centre) but once I click OK from the "Dropbox Installation" dialog box (prompting me to download the proprietary daemon) the installation just freezes with the OK button pressed. When I look at its process in System Monitor its waiting channel is inet_wait_for_connect. I have set the following proxy directives thus far: Added mj22:**@proxy.waikato.ac.nz:80 information to network proxy settings under network in settings. Added http_host and http_port variables under gconf-editor-system-proxy Added 'host', 'authentication_password' 'authentication_user' and ticked 'user authentication' and 'use_http_proxy' under gconf-editor-system-http_proxy Added export http_proxy="http://mj22:**@proxy.waikato.ac.nz:80/" to /etc/bash.bashrc Added Acquire::http::proxy "http://mj22:**@proxy.waikato.ac.nz:80/"; to /etc/apt/apt.conf (which is what I imagine is letting Software Center retrieve packages). (where ** is my password) I have also added the equivalent ftp and https lines for the above entries. I get the internet fine and Software Centre can download packages but thats it. Related issues: The software centre can't fetch reviews (but can download packages). When trying to add an online account in Gnome 3 a dialog pop up appears with "Error getting a Request Token: Cannot connect to proxy (proxy.waikato.ac.nz)" Updates: After some time (10mins ish) Dropbox shows an error dialog box that reads: Trouble connecting to Dropbox servers. Maybe your internet connection is down, or you need to set you http_proxy environment variable. Is there a way I can see what environment variables are currently set?

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• Hyper-V Cluster with failover - NETWORKING

  - by Adam

  Hi We are looking to setup a 3 node Hyper-V cluster with live migration and failover using: 3 x Dell R710's with dual quad core Xeon & 128 GB RAM & 6 NICs in each 1 x Dell MD 3220i SAN We will be running this setup from a data center and so co-locating our kit. Can anybody explain how we should setup the network connections to make the system redundant? We have looked into this great article but are not sure how to get a 3 server setup correctly and reliably: http://faultbucket.ca/2011/01/hyper-v-failover-cluster-setup/. I believe we need network connections for: live migration, heartbeat, management, hyper-v etc. I assume as we are running it from a DC all IPs will have to be public IPs? Are AD servers will be VMs. One on each Hyper-V server and setup not to be HA.

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• Business operates in multiple counties, will adding a listing in the Local Business sites harm our placement in SERPs?

  - by leeand00

  I work at a non-profit where we operate in more than two counties within our state. Our offices are located in two different towns, and that leaves a few counties of operation where we would also like to appear in their local SERPs or Local Business listings. Please note that these towns are not necessarily close to all the areas of operation. Since we don't have offices in all the counties of operation, how can we effectively post our business in the Local Business Listings and still show up in our counties of operation?

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