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• Why is "chmod -R 777 /" destructive?

  - by samwise

  This is a Canonical Question about File Permission and Why 777 is "destructive". I'm not asking how to fix this problem, as there are a ton of references of that already on Server Fault (reinstall OS). Why does it do anything destructive at all? If you've ever ran this command you pretty much immediately destroy your operating system. I'm not clear why removing restrictions has any impact on existing processes. For example, if I don't have read access to something and after a quick mistype in the terminal suddenly I now have access well... why does that cause Linux to break?

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• Multiple .bkf files created in Backupexec 12.5 or 2010 related to heavy I/O?

  - by syuusuke

  Hey everyone, I was wondering if anyone who has used backupexec 12.5 or 2010 have ever experienced multiple .bkf files created for a single job. To describe what I mean by multiple files, the .bkf are being created with random file sizes under 2GB even though I've assigned the setting to chop the file after 10GB size. Some jobs will create 20x .bkf files in 1 job with file chunks ranging from 50MB to 800MB sizes. Is this is a sign of heavy I/O issues? Bandwidth limitations? I'm not sure, I'm here to seek some advices and suggestions. I've setup another backup server with the same exact settings and they seem to create a new .bkf file when 10GB limit has been reached. Although I am backing up different machines but I know my settings are an exact match to the problematic or atleast I think it's a problem.

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• MySQL returning slow queries with result sets bigger than 30 rows

  - by josephs8

  When ever I run a query that exceeds 30 queries the time for the query to run goes from less than a second to over 10 seconds to get data. Example I run a query to return 29 rows, it takes .1 seconds, I run a query to return 31 rows it takes 11.2 seconds. I am running mySQL on Windows 2008 Server Dual Core 2.6Ghz with 3GB of Memory. The machine doesn't run anything else. It does have a instance of MSSQL running on the server but that does not get used at all. This only happens via PHP right now, If I manually run the query on the server it returns it in less than a second. The queries are not complicated either I have included one below: SELECT Name, Value FROM `bis_co`.`departments` LIMIT 31 What would be causing this issue and how can I correct this? Am I missing a configuration setting in MySQL or something. Thanks

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• How computers display raw, low-level text and graphics

  - by panic

  My ever-growing interest in computers is making me ask deeper questions, that we don't seem to have to ask anymore. Our computers, at boot, as far as I understand it, are in text mode, in which a character can be displayed using the software interrupt 0x10 when AH=0x0e. We've all seen the famous booting font that always looks the same, regardless of what computer is booting. So, how on earth do computers output graphics at the lowest level, say, below the OS? And also, surely graphics aren't outputted a pixel at a time using software interrupts, as that sounds very slow? Is there a standard that defines basic outputting of vertices, polygons, fonts, etc. (below OpenGL for example, which OpenGL might use)? What makes me ask is why OS' can often be fine without official drivers installed; how do they do that? Apologies if my assumptions are incorrect. I would be very grateful for elaboration on these topics!

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• Configuring Windows Server Backup Destination Drive Sets

  - by Nicholas

  Is it possible to set up the standard backup system in SBS 2011 (or Server 2008 R2) to use an internal drive as a destination as well as external drives? Before you say yes, from my tests and from what I've read on the web, backups with internal drives included as a destination always seems to prefer the internal drive over connected external ones. (Regardless of what drive might be marked as 'active'). So no data ever gets written to a plugged in external drive. In my opinion external drives should always have priority over internal drives or including them is pointless.

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• BES 5.x issues when connecting to Exchange 2010 SP2 RU4

  - by makerofthings7

  Ever since we updated from SP1 RU4 to SP2 RU4 we have noticed that our BES devices will simply stop receiving email. This has occurred at least 5 times in the past few weeks. Today, while speaking with RIM support (a T3 contract), they said that they have reports of sporadic connectivity issues from some BES users. This has been occurring with Exchange 2010 SP2 RU4, and have no public information to give us. We were able to temporarily get things running by doing any or all of the following Restart the BES server Recreate the MAPI profile (deleted the keys in the registry) Restart the CAS servers Wait it out (2 hours) What other options should I take to resolve this issue?

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• Preferred method for allowing unprivileged UNIX/Linux users to view syslog information

  - by Joshua Hoblitt

  I have some non-privileged "role accounts" that need the ability to view [some of] the local syslogs (eg. /var/log/messages) for debugging purposes. This is explicitly local log data, not remote syslog, logstash, etc. Obviously, there's several ways to address this issue. What I'd like to know is if there is a fairly "standardized" way to solve this issue. Typically, I solve this problem with sudo but either POSIX groups or acls is attractive as it's few chars for the users to type and it removes entries from the sudo log. However, I don't believe I've ever seen that done before. What is your experience? How do large install base sites address this?

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• Computer Invisible On Domain

  - by Giawa

  Good afternoon, I'm sorry that this isn't a programming question specifically, but stackoverflow has been great at answering questions in the past, so I thought I'd give it a shot. One of our Linux users attempted to install Cygwin on our Windows Server 2008 Domain Controller. Now it is no longer possible to browse the domain and see all of the computers. For example, \\my_domain_name will just bring up a username/password dialog box (that will not accept any username or password, even the domain administrator) and no computers will ever be listed. However, I can still connect to computers based on their name or IP address. So \\eridanus or \\192.168.1.85 still work to connect to the shared directories of computers on our network. Does anyone know where I can find these settings? and how I can fix this problem? Thanks, Giawa

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• Converting or playing a .264 video file?

  - by Dan

  I recently bought a Chinese brand DVR (to record security cams). The DVR exports the video files with a ".264" extension. This is my first time ever dealing with this video format. Anyhow I've been trying to convert the videos to any other format so it will be easier to watch the videos. The problem is that I could only find one program that can convert and play those files which is Elecard studio something, and even that Elecard studio thing is having trouble with these files, some of them are just making it crash so I can't convert them. I've tried to find some other programs but I couldn't find anything that can actually play those files. How can I play or convert these files to another format?

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• VMware - Broadcom 1000Gbps NIC does not link at 100Mbps to a Cisco switch port

  - by Spirit

  Today we've stumbled on a very awkward situation with our VMWare Server. The server is with ESX 3.5 that has a 1Gbps NIC. We bought a brand new managed Cisco Linksys switch with 10/100Mbps interface ports but when we plugged the cable in one of the ports the link simply does not wanted to activate :S... Does anyone with more VMware experience have ever had similar problem? From what I know is that 1Gbps NICs are backwards compatible with 100Mbps switches. This is what we've tryed so far but with no success: Tryed: http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004089 Tryed to modify the /etc/modules.conf folowing the guide from this article http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=813 After the changes I have restarted the networking services using # service network restart, # service mgmt-vmware restart and # service vmware-vpxa restart It seems that no matter how many times, or whatever approach/method (GUI or Shell) we try to change the speed and duplex of the network adapter and to force it to 100mbps it only accepts 1Gbps .. I am starting to go nuts :@

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• Problems restoring old backups in NetBackup 6.5

  - by gharper

  I had a server that was decommissioned & replaced last year, and since the server was no longer in use, I deleted it's client & backup policy from the NetBackup Admin Console shortly afterwards. I recently got a request to restore a file from the old server, however when I specify the source client for the restore, I get an error message saying: WARNING: server (backupserver) does not contain any backups for client (oldserver) using the specified policy type (Standard) as requested by client (backupserver). [Ok] In addition to that error, I can't seem to run a Client Backup report on the old client any more to determine what tapes I need to recall in order to re-index and restore the files... My questions: Does deleting the client somehow remove NetBackups ability to ever restore files from the old system, even if the backups have a retention period of infinity? Is there a way to restore the file from the tape, assuming I can figure out which tape I need?

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• Both screens always stay on after adding second monitor

  - by J.Merrill

  I had a single 1920x1080 monitor on a Windows 7 desktop PC and, per "power management" (not screen saver), the screen would go blank after 10 minutes. I added another monitor (2560x1600 if that matters) and since then, neither screen has ever blanked. I've tried turning on the "blank" screen saver, but that didn't help either -- I can go away for hours and when I come back, both screens are on. I've seen others with similar issues apparently caused by e.g. wireless mice that seem to move infinitesimally, but I've got the same wired mouse I had before. I can't understand why neither the screen saver nor power management is doing what it should to blank the screens, when "power management" used to do it when there was only one monitor. Maybe it doesn't matter so much with current LCD display technology (no "burn in") but doesn't a monitor use more power when "power management" hasn't turned off the display? Thanks for any suggestions.

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• Computer only booting after POWER ON/OFF 10 times or more?

  - by Jan Gressmann

  Hi fellow geeks, recently my computer started to behave like an old car and won't start up anymore unless I flip the power switch repeatedly. What happens when I power it on: CPU fans spins briefly and very slowly, then it stops Same with GPU fan No BIOS beeps or HDD activity Screen stays black After turning it on and off for like 10 times, it'll eventually boot like normal and run smooth without any problems what-so-ever. But I'm worried it might eventually die completely. Anyone know the most common cause of this? Maybe I should just leave the computer powered on? :)

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• Why do some machines respond with many RST packets instead of RST-ACK to refuse a connection?

  - by Michael J. Gray

  I have recently been trying to track down a problem with one of our systems and have noticed that it is simply not allowed to connect to a remote machine. However, the remote machine (not controlled by us) is responding to our request for a connection with many TCP RST packets on a different port (26469, 26497, 26498) than the one we originated on (53). It simply wouldn't let up at one point and flooded us with about 10 packets/second for an hour or two of only RST on those obscure high ports. Out of the thousands of nodes we're connecting to, this is the only one ever to show this behavior. What could possibly cause this? EDIT Below is a screenshot of Wireshark when it happened. I don't have the actual dump anymore and can't reproduce this specific scenario every time. Basically, we sent a SYN and immediately got RST on an odd port and so we respond with RST and just keep going back and forth.

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• Does my DLink DNS-323 need to reside on a "192.168.0.0/24" subnet?

  - by Raymond

  I've installed two brand new 2-tib drives in the DLink and plugged it in to my network. I set my router's static address table to include the MAC address of the device; however it doesn't ever "show up." Do I need to use the custom software to administer this device? Do I need to use a "192.168.0.0/24" network in order for this device to work (asking because it states that if DHCP isn't detected, it will default to an address in that range; and my network is not in that range).

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• My computer is playing audio without any program open

  - by super x man

  This is the weirdest thing ever that has happened to my computer (running Windows 7). I haven't installed anything lastly, except lavasoft adware antivirus When my computer stats then audio starts playing, mostly hip hop There is no programs opened. I tried killing all unknown processed, no success. I tried resetting the firewall options of the antivirus, no success. If I disconnect from internet, then it works. The antivirus is not detecting anything. Is somebody is streaming from another house? Is that possible? and making my life impossible. How can I check and stop this?

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• Setting font size of Closed Captions on iPhone

  - by forthrin

  Does anyone know if it's possible to control the font size on videos played in the built-in iPhone video player? The subtitles (or "Closed Captions") that are there by default are rather small. None of the attempts below change the font size at all: ffmpeg -y -i in.mkv -i in.srt -map 0:0 -map 0:1 -map 1:0 -vcodec copy -acodec aac -ab 256k -scodec mov_text -strict -2 -metadata title="Title" -metadata:s:s:0 language=eng out.mp4 sudo port install mplayer +mencoder_extras +osd mencoder in.mkv -sub in.srt -o out.mp4 -ovc copy -oac faac -faacopts br=256:mpeg=4:object=2 -channels 2 -srate 48000 -subfont-text-scale 10 -of lavf -lavfopts format=mp4 mp4box -add output.ttxt:hdlr=sbtl:size=50 output.mp4 Should we assume that iOS simply disregards size information, or has anyone ever seen styling of subtitles actually work on iOS? Anyone know how to make this work?

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• Update a DNS to a for a dynamic IP

  - by zobgib

  I want to use my schools connection as a place to host a small webserver but one problem I have run into is anytime my server reboots I am given a new IP inside the schools range. All of the schools IP are public and therefor I can access my computer directly over WAN just via the IP given in ifconfig. I would like to be able to give my computer a dns which is easy enough when I change the Arecords to match the current IP of my computer. The problem is if my computer ever reboots (my school regularly cycles power at night and over holidays) I am assigned a new IP and have to realize it then update the Arecords This is inconvenient and I figure there must be a better way to keep the DNS records updated either via a script or my own BIND server. That way if there is a power cycle I can still access the server via a Domain Name. If you have any direction to point me in it would be much appreciated. I am running Ubuntu 10.04 if that helps :).

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• how to setup a ssh acount with no terminal but port forwarding?

  - by admalledd

  I am trying to set up a new user account I can give to friends so they can SSH into my forward computer, and only allow forwarding of certain ports. I do not want my friends to have a shell, or be able to change what ports to where they are allowed to forward. example session: joe(friend) connects using PuTTY (that I have pre-set, he isn't good with computers) to example.com(my Internet facing computer) forwarding ports 8080,1990,25565 to him(with what ever end ports he wants, preferably they stay the same numbers) example ssh command to do similar (but he can still change the ports on my computer!) ssh -N [email protected] -p443 -L8080:192.168.1.2:8080 -L1990:127.0.0.1:1990 -L25565:127.0.0.1:25565 then, same story with other friend smith(same ports, same user even) except he is using linux, so cant use putty. is it possible to also leave default SSH functinality for all other users but this one? I found this when I was searching google, but alas, I did not quite understand what was being suggested, and I don't think they covered restricting port forwarding

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• How to follow up new technologies and software releases as they come out

  - by Developer

  I don't know if this is right place to ask question, if not please move it to right area please. Is there a website/app/forum/newsletter where I can followup different softwares or technology and feature soon after their new releases. i.e. ipad iphone ios 7 release as soon as it will release with its feature. andriod next version soon after it release with its feature. coreldraw x7 whenever it will rlease zend framework new version when ever it will release. mac php new version photoshop new version ....... there are lot more list than that which goes on and on and Its difficult to follow up new technology as they come out. Any better and less time consuming way to follow up.

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• I believe I need a wireless access point, but can I do it with a wifi router?

  - by Flotsam N. Jetsam

  My needs are simple, I think: I have a laptop upstairs with a usb wifi that I use to connect to my neighbor's wifi which I share (with their knowledge). I have a laser printer downstairs that my wife doesn't wants to stay down there (big, bulky and ugly), but that we both need to print stuff off. It has wired networking and I have wired hub and router down there. The usb wifi on the laptop has absolutley the best reception I've ever seen or heard of. I cannot get onto the neighbor's net with the thing downstairs though--sortof in the ground. What do I need downstairs to give printer access to my laptop wirelessly? One thing I can't do in this solution is have a computer on downstairs, so I would think that would eliminate a usb solution.

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• Can't set correct desktop resolution on Windows 7 after playing Mirror's Edge

  - by DeadMG

  Ever since I launched Mirror's Edge, my entire system seems to think that my monitor is 1600x1200, when actually it's 1920x1080. The game would only go up to 1600x1200, Windows will only go up to 1600x1200, and even my video drivers will only go up that high. The monitor isn't even that aspect ratio. I've rebooted the system to no effect, and installed the latest graphics drivers for my Radeon 5770, unplugged it and re-plugged it, etc. My secondary screen is still working perfectly correctly. Any suggestions?

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• Is running multiple databases on login going to make my Mac really slow?

  - by Walrus the Cat

  Sometime ago, I installed Postgres, and the Launch agent that causes it to run when I log in. Just now, I did the same thing for Mongo. I was just about to do it for Couch. I don't remember if I ever did it for MySQL, but I probably did. Mongo and Couch are just 'when I have time to look into it' sort of things, but I don't want to have to remember to start them when I do. I have a 2.4 Ghz processor and 8 GB ram. Is this sort of behavior going to significantly impact my computer's performance? Should I be scrambling to uninstall all but the database I'm currently using, or can I install all the things and run them all the time? Thanks

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• Possible to redirect from HTTPS to HTTP behind load-balancer?

  - by Derek Hunziker

  I have a basic ASP.NET application that sits behind an F5 load-balancer. Incoming SSL requests (over HTTPS) terminate at the load-balancer and all internal communication between the load-balancer and my application servers is unsecure (over HTTP). When a unsecure request comes in, my app is able to use Response.Redirect("https://...") to redirect a secure URL with no problems. However, the other direction appears to be impossible - I cannot redirect from HTTPS to HTTP using Response.Redirect() from my application. The URL remains HTTPS for the client and does not change. Could the F5 be preventing the redirect for ever reaching the client? Is there any special configuration necessary to let this happen?

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• How to remove an entry from Chrome's Remembered URLs from the url bar?

  - by cmcculloh

  I've got a url in Chrome "local.mysite.com" that autopopulates when I start typing "local.my" into the URL bar. Note that this URL DOES NOT EXIST in my browser history (at chrome://history/#e=1&p=0) because it isn't a real site and therefor couldn't ever be successfully visited and therefor never shows up in my history. The URL I want is "local.mysite.com/subdir/". That URL is like 3 down in the suggested results because I keep accidentally hitting "enter" when it auto-suggests the unwanted first URL and thus re-enforcing it's assumption that that is the one I want. How do I get rid of the "local.mysite.com" entry in Chrome's memory?

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