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• Could we build a mega-processor out of superconductors?

  - by Carson Myers

  A superconductor, once cooled below a critical temperature, loses all of its electrical resistance and therefore becomes 100% efficient. This means that when a current flows through a superconductor, none of the energy is lost to heat or light. Theoretically, could we build a processor out of superconductive materials, that could effectively run at, oh I don't know, say, 300ghz? or 5,000ghz? Since a superconductive circuit is 100% efficient, this means that once supplied with electricity, the source of power could be completely removed from the circuit and the current would continue to flow forever. So if we made all the components inside a computer out of superconductive materials, could we get away with only supplying power to the peripherals and save a-whole-lot on energy, while dramatically increasing computing speed? Might this be one of the next big breakthroughs in computing? What do you think?

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• Laptop as server [closed]

  - by Parhs

  My client wants to use a cheap AMD E-300 ,5400 rpm disk,4gb memory laptop as a POS server and music player at the same time with dual screen. I couldnt convince him that this wouldnt be a good choice. The applications are a database a music player ,and the .net 4 application. I am afraid of performance issues. However the reasons for this choice is that laptop takes not much space ,easy dual screen for music player and application ,can easilly be replaced and that it will last forever as none of his laptops are ever broken. I believe that this is a good idea but i feel thats something wrong there. Do you believe that is an ok choice?

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• Asus G53SX How to use the recovery partition

  - by Amento

  I am trying to use the recovery partition on my Asus G53SX laptop, but the instructions in the included booklet don't match up with what happens on the computer. It says press F9 during bootup and then press ENTER to select windows setup. Then select the language you want to recover, and so on. When I press F9 I end up in the boot manager and from there I can access safe mode and all these things. The closest thing I can find in this list is "Repair your computer" but this menu takes me to recovery points and backup images, none which are mentioned in the booklet. How can I use the recovery partition to restore my laptop to factory state?

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• redirect to 404 wildcard subdomain

  - by Leandro Garcia

  I setup a wildcard A record on my domain registrar. Now if a user access a missing subdomain on my domain, they will be redirected to the homepage. Currently my initial setup was this: <VirtualHost *:80> ServerAdmin webmaster@localhost RewriteEngine On RewriteRule ^(.*)$ http://domain.com$1 [R] DocumentRoot /var/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> # more below... </VirtualHost> Any wildcard subdomain or if my IP is entered via URL will redirect to the homepage. Can I do something about this that will redirect (HTTP redirect perhaps) the wildcard subdomains to 404 page instead of to homepage?

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• Installing and maintaining an email server

  - by Andrew

  I need to move hosting providers for four or five domains and for several reasons I'm considering a Linux VPS rather than staying with my current shared, managed hosting provider. The only thing that's stopping me is email. I have lots of experience running and maintaining Apache, but none with email servers. Based on some research, if I want to keep what I've using now, it looks like I'd be going with Postfix and Dovecot, and probably Exim and SpamAssassin. I have no problem performing regular maintenance and watching for security updates, but I don't want to bite off more than I can chew. For someone new to email services, how hard is it to set up an email server that is externally accessible (via SMTP and POP3, not IMAP), available over SSL/TLS and reasonably reliable for multiple domains? How much of a time commitment is it to maintain one?

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• Set mouse or keyboard button to simulate left click and hold or rapid left click repeating in Windows?

  - by miahelf

  Does anyone know a way to configure Windows 7 or use third party software to do this? I would like to click my middle mouse button and have it tell Windows to left click and hold until I click the middle mouse button again. A keyboard key would be fine as well. Some games and apps have me holding down the left mouse button for a long time and I would like to reduce the stress on my mouse hand. Also, I would like to do a similar thing but have it repeatedly click the left mouse button automatically if possible. If none of that is possible, how about temporalily setting a keyboard key to achieve a left mouse button emulation?

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• User cannot book a room resource in Exchange 2010

  - by bakesale

  Im having a problem with a specific user not being able to book a room resource. No error message is generated at all. The user attempts to add the room as a meeting resource and it simply doesnt register with the resources calendar. I have tested the resource with other accounts and other rooms for this user but it is only this room that is having issues for this user. This Exchange server was migrated from 2007 to 2010. All rooms except for the problem room were created back on Exchange 2007. This new room was created with Exchange 2010. Maybe this clue has something to do with the problem? This is a paste of the mailboxes folder permissions [PS] C:\Windows\system32Get-MailboxFolderPermission -identity room125:\calendar RunspaceId : 448ab44a-4c2a-4403-b46c-fce1106c0823 FolderName : Calendar User : Default AccessRights : {Author} Identity : Default IsValid : True RunspaceId : 448ab44a-4c2a-4403-b46c-fce1106c0823 FolderName : Calendar User : Anonymous AccessRights : {None} Identity : Anonymous IsValid : True

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• Quickly open Windows Mobility Center in Windows 8 "tablet" mode

  - by piyo

  I am using a Surface Pro (2013). I would like to know if there is a quick way to open the Windows Mobility Center desktop program. I like to use this program because it is easy to manipulate during the "tablet" (non-keyboard, no-mouse) mode. This program has multiple ways to be started, according to From How to Open and Use Mobility Center in Windows 7 and Windows 8: (Windows 8) Press Windows key + X and select Mobility Center Open the Control Panel and select "Windows Mobility Center" Open the Run dialog and type "mblctr.exe" and press Enter key. None of these are quick and easy when in "tablet" mode. I would ideally like to swipe from right screen edge into to open the Settings pop up and select one icon that opens the Mobility Center. Alternatively, another way I would like to have implemented would be to touch the Windows icon on the tablet screen outside of the viewing area and touch an "app" to launch the Mobility Center. Alternatively, it would be nice to have a Live Tile App that duplicates this functionality.

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• Using Squid on Debian, Cannot Connect Error

  - by Zed Said

  I am trying to set up Squid on Debian and am getting a connection refused error: squidclient http://www.apple.com/ > test client: ERROR: Cannot connect to 127.0.0.1:3128: Connection refused Here is my config: visible_hostname none cache_effective_user proxy cache_effective_group proxy cache_dir ufs /var/spool/squid 2048 16 256 cache_mem 512 MB cache_access_log /var/log/squid/access.log emulate_httpd_log on strip_query_terms off read_ahead_gap 128 Kb collapsed_forwarding on refresh_stale_hit 30 seconds retry_on_error on maximum_object_size_in_memory 1 MB acl all src 0.0.0.0/0.0.0.0 acl purgehosts src 127.0.0.1/255.255.255.255 # Caching static objects in __data is important. # Without that, apache processes sit around spooling static objects. acl QUERY urlpath_regex /cgi-bin/ /_edit /_admin /_login /_nocache /_recache /__lib /__fudge acl PURGE method PURGE acl POST method POST cache deny QUERY cache deny POST http_access allow PURGE purgehosts http_access deny PURGE http_access allow all http_port 127.0.0.1:80 http_port 50.56.206.139:80 cache_peer 127.0.0.1 parent 80 0 originserver no-query no-digest default redirect_rewrites_host_header off read_ahead_gap 128 Kb shutdown_lifetime 5 seconds Any ideas why this is happening? What have I missed?

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• YouTube videos not working

  - by André

  I have a problem with watching YouTube videos. It says: "An error occurred, please try again later". I've tried loading different videos and that's what it says to all the videos I try to watch. I've tried using another browser, clearing cache + cookies etc, but none of that really worked out. My operating system is Windows 7 Home Premium, I use Google Chrome as my browser. And the YouTube videos was able to be watched earlier. I suspect that it has something to do with the PC, since I've got YouTube working on my laptop earlier. Not sure if it still works on my laptop though. Hope I've given enough information for you to help me out with this problem. Feel free to ask if there's anything else you need to know. Hope you can/will help me out. :)

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• Some people suddenly say they cant access my site, but me and all others can

  - by Cain

  I have had this problem many times before and im still unable to find out what is causing it. It happned to me some months ago but it got fixed by itself and had already gone back to normal. Everything was working fine for quite a while until 2 days ago. Some people are reporting they cant access my site, they get a 404 error, however i can access it normally and many other users cant. I dont know whats the common denominator since both groups of people are from the same countries, use the same browsers, OS, etc. so the issue doesnt seem related to that. I have reported this problem before to my both my host and domain registrar but none of them claim responsibility for that. Who is then to blame? Waht can i do to find out whats causing the issue and solve it? Thank you.

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• Kickstarting VMWare ESX 4.1 (Error: No NIC with name bootif)

  - by William

  I'm having an issue kickstarting an installation of VMWaare ESX Classic 4.1. I've stripped down my kickstart a bit to just: accepteula keyboard us auth clearpart --firstdisk --overwritevmfs url --url=10.16.0.1/cblr/ks_mirror/esx-classic-4.1.0-260247 rootpw --iscrypted $1$zZJa3g7g$mD8d.6QgbPku1QovQTAps/ timezone 'US/Pacific' network --addvmportgroup=true --device=vmnic0 --bootproto=dhcp part '/boot' --fstype=ext3 --size=1100 --onfirstdisk part 'none' --fstype=vmkcore --size=110 --onfirstdisk part 'datastore1' --fstype=vmfs3 --size=8920 --grow --onfirstdisk virtualdisk 'esxconsole' --size=7920 --onvmfs='datastore1' part 'swap' --fstype=swap --size=916 --onvirtualdisk='esxconsole' part '/var/log' --fstype=ext3 --size=2000 --onvirtualdisk='esxconsole' part '/' --fstype=ext3 --size=5000 --grow --onvirtualdisk='esxconsole' %post --interpreter=bash However, when I attempt to use this kickstart during a PXE install with no additional kernel options, I get the following error: There was a problem with the Network Device specified on the command line. Error: No NIC found with name bootif If I comment out the network line in the kickstart, the error changes to: There was a problem with the Network Device specified on the command line. Error: No NIC found with name eth0 How can I fix this? Thanks.

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• Bash Script Exits su or ssh Session Rather than Script

  - by Russ

  I am using CentOS 5.4. I created a bash script that does some checking before running any commands. If the check fails, it will simply exit 0. The problem I am having is that on our server, the script will exit the su or ssh session when the exit 0 is called. #!/bin/bash # check if directory has contents and exit if none if [ -z "`ls /ebs_raid/import/*.txt 2>/dev/null`" ]; then echo "ok" exit 0 fi here is the output: [root@ip-10-251-86-31 ebs_raid]# . test.sh ok [russ@ip-10-251-86-31 ebs_raid]$ as you can see, I was removed from my sudo session, if I wasn't in the sudo session, it would have logged me out of my ssh session. I am not sure what I am doing wrong here or where to start.

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• Slow internet using Arch Linux

  - by GZaidman

  after a week or so of using Arch Linux I cant access the internet - it takes around 5 mins to load google (most of the other websites just give me a timeout), pacman's downloading speed range between 5-2Kbs, and pinging google takes around 9Kms. I'm connected using wireless network (wifi card is Intel Ultimate 6300 and router is Edimax 6524n). Every other Windows machine that's connected to the network (and even the T410 running Windows) is fine, so the problem lies in Linux. So far, i checked the resolv.conf file (my router ip address is listed), and the hosts file (pretty much default), and I disabled the ipv6 module. None of that helped. PS: i'm using NetworkManager (but the problem still occurs when connecting using wicd) running on Gnome3. Thanks in advance for any help you can provide! EDIT: something really strange happens whenever I ping google: i get an unknown host 'google.com', but the bit rate from the card jumps at the exact second I ping google (so far, the bit rate jumped to 54Mb/s from 1Mb/s over the course of 4 pings).

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• SELinux "allow httpd_t httpd_sys_content_t:dir write;"

  - by alexus

  I'm getting following message in my /var/log/audit/audit.log: type=AVC msg=audit(1402615093.053:68): avc: denied { write } for pid=799 comm="httpd" name="php" dev="xvda1" ino=8667365 scontext=system_u:system_r:httpd_t:s0 tcontext=unconfined_u:object_r:httpd_sys_content_t:s0 tclass=dir type=SYSCALL msg=audit(1402615093.053:68): arch=c000003e syscall=2 success=no exit=-13 a0=7f7a5ca697a8 a1=241 a2=1b6 a3=1 items=0 ppid=662 pid=799 auid=4294967295 uid=48 gid=48 euid=48 suid=48 fsuid=48 egid=48 sgid=48 fsgid=48 tty=(none) ses=4294967295 comm="httpd" exe="/usr/sbin/httpd" subj=system_u:system_r:httpd_t:s0 key=(null) pipe audit2allow outputs: #============= httpd_t ============== #!!!! This avc can be allowed using the boolean 'httpd_unified' allow httpd_t httpd_sys_content_t:dir write; How do I apply allow httpd_t httpd_sys_content_t:dir write; to my current SELinux policy?

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• Redircting to a url that has a question mark in it?

  - by dkmojo

  I have a somewhat strange problem. A client has moved their site to Wordpress. They use a service for link exchanges that has a Wordpress plugin. The issue is that the new links pages use a query string to display the correct content and I cannot figure out how to redirect the old URLs correctly. Old URLs look like this: domain.com/link/category-name.html The plugin makes them look like this in WP: domain.com/links/?page=category-name.html How in the world can I get the redirect to work properly? Here's what I have tried: Redirect 301 /link/actors.html http://www.artisticimages.biz/links/?page=actors.html Redirect 301 /link/actors.html http://www.artisticimages.biz/links/%3Fpage=actors.html Redirect 301 /link/actors.html http://www.artisticimages.biz/links/\?page=actors.html But none of those have worked. Any help is greatly appreciated!

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• Need software to save videos from 4tube.com - to watch the videos smoothly

  - by Harold34

  Isn't there a programs that will capture screen writes at the hardware level? I have tried several Firefox add-ons, and several stand-alone programs, and none of them will save videos from this site. I even paid for Replay Media Catcher, and it didn't work, so I got a refund. (The website for the best Firefox video downloader I have, Downloadhelper, said Replay Media Catcher worked with that site.) I have a slow internet connection, and cannot watch videos smoothly unless I can cache them. This site (4tube.com) doesn't cache, when you restart, it reloads, when you pause it stops - so I need to be able to save the videos to be able to watch them.

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• DHCP over WiFi on CentOS 6 [closed]

  - by dongle26

  Using CentOS 6 I cannot get my WiFi interface to configure over DHCP. Here is my ifcfg-wlan0: This does not work (although it is correct): DEVICE=wlan0 BOOTPROTO=dhcp ONBOOT=yes HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless This works: DEVICE=wlan0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.0.253 NETMASK=255.255.255.0 DNS1=192.168.0.99 GATEWAY=192.168.0.99 HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless I don't want a static IP address, I want a DHCP assigned address. Update: Both of the above configs are correct. Please don't downvote, this really didn't work for me. It must be a bug in CentOS or my wireless driver. See my answer for details.

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• zfs rename/move root filesystem into child

  - by Anton

  Similar question exists but the solution (using mv) is awful because in this case it works as "copy, then remove" rather than pure "move". So, I created a pool: zpool create tank /dev/loop0 and rsynced my data from another storage in there directly so that my data is now in /tank. zfs list NAME USED AVAIL REFER MOUNTPOINT tank 591G 2.10T 591G /tank Now I've realized that I need my data to be in a child filesystem, not in /tank filesystem directly. So how do I move or rename the existing root filesystem so that it becomes a child within the pool? Simple rename won't work: zfs rename tank tank/mydata cannot rename to 'tank/mydata': datasets must be within same pool (Btw, why does it complain the datasets are not within same pool when if fact I only have one pool?) I know there are solutions that involve copying all the data (mv, or sending the whole dataset to another device and back), but shouldn't there be a simple elegant way? Just noting that I do not care of snapshots at this stage (there are none yet to care of).

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• How can I repair the boot loader on my laptop?

  - by zbalata

  I had removed my HD from a Dell laptop and accessed it with an external HD port on another computer. Though after returning it to the Dell laptop, it will no longer boot. The PC came pre-installed with Windows 7 and I do not have an installation disk. None of the contents of the original install have been removed or modified. If I use another laptop running Windows 7 to create a repair/recovery disk, would I be able to use it on my Dell to repair the boot sector? How can I repair the bootmgr? It's frustrating knowing there's a perfectly good operating system there that wont boot. Thanks for your time!

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• Which PHP accelerator to use with prefork mpm (CentOS and RedHat default httpd settings)

  - by FractalizeR

  Hello. As you know, even if it is possible to start httpd in worker mode under CentOS/RedHat, php in default rpm repo is not thread-safe. And the default configuration for stability is mpm_prefork. So, two questions: Is there PHP accelerator capable of working in mpm_prefork mode (using shm or whatever)? If there is none, what can be done to improve PHP speed on CentOS/RedHat systems (I want to use rpms, preferably from default CentOS repo; building custom PHP from source code is not a good option for me)

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• Snap Server 18000 connection help!

  - by sicko666

  I wonder if anyone here can help me. I have a home server setup made up of old secondhand computers, 2 servers running Windows Server 2003, 1 workstation running Windows 7, a 16 port switch & an adsl ethernet modem. All these connect and talk to each other fine but then I got a "Snap Server 18000" and a "Snap disk 30sa" sata array. When I turn the Snap on, it boots past the BIOS, runs a kernel, then displays: This device cannot be managed via the video/kbd/mouse interface. The video is now disabled. You may access the management functions from your web browser. Only, none of the other PCs detect it, so no browser can find it! I have checked all cables, and all LEDs indicate there's a connection. I have installed the windows "iscsi" and the adaptec "Snap Server Manager" on all PCs but still it's not detected. I don't know what else to do, please advise!

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• Linux clients and Windows Servers can connect but not windows clients

  - by Mustafa Ismail Mustafa

  This is driving me insane because I can't make head or tails of it. We have two DCs (W2K3 SP1) and I'v tried this once on each machine as a sanity check. DHCP is being served by either one of the machines and all machines get an address no problem. The servers can connect/ping/browse to the www and so can all our linux clients. But NONE of our windows clients (all windows 7). I can do anything within the network, I can even ping the firewall/router but nothing from the windows clients is leaving the confines of our subnet. I don't get it. The linux and windows clients are both served from the same DHCP server, the gateway is the same, everything is the same. Anyone care to take a shot at how to resolve this? I tried adding explicit routes at the clients, but still no go. TIA SMIM

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• MSSQL instance shuts down

  - by citronas

  I'm currently developing a new ASP.net project hosted on a Windows Server 2008 RC2 with an MSSQL 2008 Express Database. I have three SQL instances (for different purposes) running which currently all contain a single database. For apprently no reason, these instances tend to shut down after some days, for no apparent reason. There might be low or none traffic to these instances, because there might be some days in a row, where I can't develop. It now occured several times, that one or two of these three instances just shut down, so that I can't access the database, without manually starting the instance. I can't seem to find a event log entry for the shutdown, which is most likely because I just enabled logging (why is the default setting off?) So the questions are: * Why does a SQL instance shut down? (Is there such thing as a "Shut down instance after 3 days of inactivity"? * How can I achieve that the instances are running 24/7?

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• fedora 11 server won't boot from SATA disk, won't boot from CD, BIOS configuration problems

  - by Tom

  Hi all, Yesterday our fc11 file/print server didn't boot, and had stopped on the BIOS page with a configuration problem. (with a distinct lack of foresight) I reset the BIOS settings to default without recording the message and booted the server. The server ran until it was to be booted this morning, and it was failing to mount the root partition from the SATA disk. It also failed to boot from a known good diagnostics CD. After a few more tries, it now fails part way through the Phoenix - AwardBIOS screen where it is listing the SATA/IDE devices, and it is showing garbage for the identity of one of the disks, which should actually be "none" It looks like the motherboard has gone kaput. The motherboard is an EVGA NF790i, are there any diagnostic tools that I can use to determine this? (as I would prefer to not send the motherboard back, only to discover that it is the RAM or the CPU) ps I can't get it to boot from the memTest disk, so I can't run that diagnostic. Thanks!

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