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• Is SYN flooding still a threat?

  - by Rob

  Well recently I've been reading about different Denial of Service methods. One method that kind of stuck out was SYN flooding. I'm a member of some not-so-nice forums, and someone was selling a python script that would DoS a server using SYN packets with a spoofed IP address. However, if you sent a SYN packet to a server, with a spoofed IP address, the target server would return the SYN/ACK packet to the host that was spoofed. In which case, wouldn't the spoofed host return an RST packet, thus negating the 75 second long-wait, and ultimately failing in its attempt to DoS the server?

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• What was your biggest waste of money, and what should you have bought instead? [closed]

  - by rob

  I waste a lot of money on computer equipment and other electronics that I don't really need. I've also bought software that I've never really used, or which as been replaced by better free software. As I'm buying things, it doesn't seem like much--fifty bucks here, a hundred dollars there. But when I go back and look at how much I've spent over my past few electronics purchases, I usually start to think of the other things I could have bought with that money instead. Most of the computer hardware and electronics don't usually improve my life by much, if at all. Case in point: back when I was in college, I prided myself on getting the best deals for computer hardware, but when I went back and added up all the money I had spent, I had probably wasted close to a thousand dollars on "cheap" $100 hard drives that eventually all went bad (including the warranty replacements). Even if they did still work, it would not be worth the effort to use them, because they're too small and too noisy by today's standards. I've also spent thousands more on other junk, such as RAM and CPU upgrades that only gave modest performance jumps, and wireless audio transmitters that I used for a short time to stream music from the now-defunct Yahoo! Music service. Every time I see a really great deal on RAM or video cards, I come one click away from buying them, but these days I'm usually able to resist. I've been wanting to get into woodworking ever since I moved into my house, and five years later I'm finally saving up for a $600 table saw. Sure, I've already got a toolbox and a couple of the essential power tools like a drill and a jigsaw, but I can't help but think that I'd have an entire shop full of woodworking tools and a lot of nice wood furniture if I hadn't wasted all that money back in college. What has been your biggest waste of money on computer stuff and technology? If you had all that money back, would you make the same mistake again and buy the same types of things, or would you spend it on something else?

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• How do I reference the value of a constructed environment variable in a loop?

  - by Rob Spieldenner

  What I'm trying to do is loop over environment variables. I have a number of installs that change and each install has 3 IPs to push files to and run scripts on, and I want to automate this as much as possible (so that I only have to modify a file that I'll source with the environment variables). The following is a simplified version that once I figure out I can solve my problem. So given in my.props: COUNT=2 A_0=foo B_0=bar A_1=fizz B_1=buzz I want to fill in the for loop in the following script #!/bin/bash . <path>/my.props for ((i=0; i < COUNT; i++)) do <script here> done So that I can get the values from the environment variables. Like the following(but that actually work): echo $A_$i $B_$i or A=A_$i B=B_$i echo $A $B returns foo bar then fizz buzz

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• Laptop charger disconnects and reconnects, charger or battery broken?

  - by Rob

  I've got an Acer Aspire One netbook (AOA-150) and there's obviously something wrong with it. The charging port gets VERY HOT and the charger seems to disconnect and reconnect quickly sometimes. This only happens when the netbook is running, and it doesn't seem to care what it's doing other than being on. The battery has an extremely short life (< 30minutes, sometimes) and I almost exclusively run it on the power cable (which needs the battery plugged in. Having it just plugged into the wall won't start up). Does this sound like a problem with the power cable or the battery? The plug for the cable and the port get so hot that if I held them for longer than a few seconds, I'm sure I'd get burnt. EDIT Just got "Popular Question" on this and it WAS the power jack. The ground on it came loose from the board. A bit of solder on it and everything is working great again.

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• What configuration management solutions exist in a non-networked environment?

  - by Rob Spieldenner

  My servers exist in an environment without outside network connectivity (this is a requirement), so when I deploy updates all packages, binaries, config files, etc. must be included on the delivered media. And of course I want some sort of configuration management so I can tell what has and hasn't been installed. So I was wondering if people had experience with chef, puppet, or another configuration management type tool for dealing with this type of environment. Worst case I deploy my updates as an RPM. EDIT: My setup has both Linux servers and Windows servers.

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• Installing httpssl module on a running NGINX server

  - by Rob

  Hi, New to NGINX, we inherited a project that runs Django/FCGI/NGINX on a hosted RHEL box. A requirement has come in that the site now needs to have ssl enabled. Client was pretty sure the person who had built the site had made it so they could use ssl. I backed up the conf file, added the server block for the ssl instance and tried to reload. Reload failed because it didn't recognize the ssl in this line: ssl on; Not an NGINX expert, but the David Caruso in me tells me that the server (sunglasses on) is not secure. I know that you need to configure NGINX at install with this module. If this didn't happen, how hard/risky is it to reconfigure a running nginx box with this module given that we didn't configure it in the first place.

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• How to compare mp3, flac audio data in a file, ignoring header data (ID3 tag) etc.?

  - by Rob

  I've backed up some audio files up in 2 places and added ID3 tags into one backup but not the other, since time has passed my own memory has faded on whether the backups are actually the same, but now one has ID3 data and the other doesn't, basic binary compare will fail and inspection will be cumbersome. Is there a tool to compare just the audio data (not the header, ID3) in mp3s, flac files, and other files using header data such as ID3. started a thread on beyond compare here: http://www.scootersoftware.com/vbulletin/showthread.php?t=7413 would consider other comparison software that does this task

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• How to get the Classic Start Menu in Windows 7?

  - by Rob Kam

  Classic start menu is simple and efficient, but the Vista style start menu gets in the way from letting me get on with what I want to do. It also has features I don't want, such as an irritating bitmap that changes according to where the cursor hovers. I've managed to disable most of the unwanted cosmetics and animations but it's still not the dull old Classic Menu that I prefer. How to get the Classic Start Menu in Windows 7 but without a kludge if possible?

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• Do I really need mod_security?

  - by Rob

  I'm doing a clean install of my server and I'm looking for some advice on whether or not I actually need the Apache mod_security module. I consider myself to be a bit security paranoid when it comes to my servers, but is it worth going through all the hassle to install and debug a new config of mod_security?

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• Virus on site but can't find where

  - by Rob

  WARNING! THIS IS ABOUT A VIRUS ON MY SITE. IT APPEARS IT HAS BEEN THERE FOR SOMETIME AND I'VE HAD NO PROBLEMS. BUT PLEASE BE CAREFUL. READ EVERYTHING I SAY AND SEE IF YOU CAN HELP ME WITHOUT VISITING THE LINK. AVG PICKS UP ON IT AND BLOCKS IT, MCAFEE DOES NOT. Sorry about the warning, obviously i'm not here to get anyone infected or anything like that. Basically I run the website sortitoutsi dot net. Ages ago I got a virus on my computer, they got hold of my FTP passwords and added some lines of javascript to the top of my site. I removed them and believe it was fixed. However i'm using the "Web Developer" extension for Firefox and chose to view all javascript on my page and find there are various links to horrible urls such as: gittigidiyor-com.excite.co.jp.webmasterworld-com.eastmusicdirect.ru:8080/aboutus.org/aboutus.org/google.com/skycn.com/torrents.ru.php and gittigidiyor-com.excite.co.jp.webmasterworld-com.eastmusicdirect.ru:8080/index.php?jl= These terms do not appear anywhere. In the source code, in any of the javascript or the css. I also can't see that there are any rogue images that I don't recognise either. So i've no idea where this javascript is coming from. Can anyone suggest how I can find references to these links and remove them? I can see them both in the Web Developer firefox extension and in the net tab using Firebug. Any help would be greatly appreciated

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• Enable gzip on Nginx

  - by Rob Wilkerson

  Yes, I know that there are a lot of other questions that seem exactly like this out there. I think I must've looked all of them. Twice. In desparation, I'm adding another in case my specific configuration is the issue. Bear with me. First, the question: What do I need to do to get gzip compression to work? I have an Ubuntu 12.04 server installed running nginx 1.1.19. Nginx was installed with the following packages: nginx nginx-common nginx-full The http block of my nginx.conf looks like this: http { include /etc/nginx/mime.types; access_log /var/log/nginx/access.log; sendfile on; keepalive_timeout 65; tcp_nodelay on; gzip on; gzip_disable "msie6"; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } Both PageSpeed and YSlow are reporting that I need to enable compression. I can see that the request headers indicate Accept-Encoding:gzip,deflate,sdch, but the response headers do not have the corollary Content-Encoding header. I've tried various other config values (gzip_vary on, gzip_http_version 1.0, etc.), but no joy. As far as I know, I can only assume that nginx was compiled with compression support, but if there's any way to verify that, I'd love to know. If anyone sees anything I'm missing or can suggest further debugging, please let me know. I'm no sysadmin and I'm new to Nginx so I've exhausted everything I can think of or have read. Thanks.

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• MacPro will freeze after first startup and first time screen saver activates

  - by Rob Segal

  I've run into a bizarre situation every time my MacPro first starts up in the morning when I get to work and the screen saver activates for the first time. When I try to deactivate the screen saver hitting the keyboard or mouse nothing will happen. At best I will get one of the following... Able to move the mouse but clicking does nothing Login prompt will show up but typing on the keyboard does nothing At worst the screen will be fully locked. In all cases I will have to reboot my machine to get it to work again. After this initial restart the machine is fine for the rest of the day. Anyone encountered something like this before?

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• Windows Server 2008 can't start postgresql-x64-9.0 service: could not create any TCP/IP sockets

  - by Rob

  After rebooting a Windows Server 2008 machine to apply system updates, we recently we began having some issues running PostgreSQL 9.0. When we noticed the problem, we reverted the Windows updates, but the issue persists: From services.msc, attempting to start the postgresql-x64-9.0 service fails. Half-way through starting the progress bar becomes very slow, and eventually responds with error 1053; "the service did not respond in a timely fashion." Interestingly enough, bringing up the task manager shows multiple instances of postgres.exe have been started, and looking at the log file shows: 2011-02-10 14:44:02 ESTLOG: database system is ready to accept connections I then tried killing the processes, and starting via the command-line (as the user postgres), but I receive a different error: C:/Program Files/PostgreSQL/9.0/bin/pg_ctl.exe start -N "postgresql-x64-9.0" -D "F:/SHARE/postgres" -w waiting for server to start............................................................... pg_ctl: could not start server ESTWARNING: could not create listen socket for "192.168.0.101" ESTFATAL: could not create any TCP/IP sockets The log file again indicates that the database is ready to accept connections. Also, using netstat indicates that no other processes are using port 5432; I can't think of any other obvious reason that opening the listen socket might fail. Any help would be greatly appreciated.

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• Windows 7 shows a drive as full in summary but files shown on drive are very small

  - by Rob

  I have a drive partitioned so it is seen by Windows as 2 drives: C:\ and D:\ Windows 7 shows D:\ as full up in the graphical summary in 'My Computer' summary of all the drives, e.g. the bar graph indicates full and nearly all of the drive's capacity, 108Gb, is full. So I go into the D:\ drive to look at the files, I see several folders. I select them all and the right-click menu Properties to count their size, expecting the value to be about the same as what Windows reports in the summary, i.e. nearly 108Gb. But the properties window shows the files are very small, Kbs and Mbs, nowhere near 108Gbs. One of the folders is a backup, but its size is very small. I've checked the folder options to show all system files and hidden files too - and counted these in the properties. Something invisible is holding the space. What is happening here? I'm afraid to delete anything if it removes valuable backups. Have I got huge backups here? Why can't I see them? How do I see them?

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• Windows Server 2008 R2 - 180 day evaluation vs. 10 days + 5 re-arms

  - by Rob

  The content on the Server 2008 R2 Trial Software page states that it can be evaluated for upto 180 days, however on a test machine we installed last week, it's requesting "re-arming" every 10 days, which seems to be do-able a maximum of 5 times? How do we get it to last more than 50 days, as it'd be a pain to have to rebuild the server concerned!

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• Enlarging everything on 16" 1920x1080 notebook display in Windows 7

  - by Rob

  Does Windows 7 have an option to enlarge everything on the screen, e.g. via a spi setting? How well does this work? i.e. do the objects look clear when enlarged? I ask this because sometimes software that enlarges non-photographic bitmap images e.g. icons and symbols can leave them artifacted with harsh jaggier slopes and blurred lines. I've tried the dpi setting in Windows XP but it doesn't enlarge everything, and some things are not so clear as described above. I'm looking at a notebook/laptop with this spec. I've already enjoyed using a 15.4" 1920x1200 display for 5 years. I've tried the dpi setting in Windows XP but it doesn't enlarge everything, and some things are not so clear as described above. I am buying a laptop for my father who will probably prefer larger objects on the screen, although I want to provide some future proofing by allowing more on the screen if needed. I'm not interested in answers that debate the effectiveness or otherwise merits of 1920x1080 on a 16" display, please. The alternative option of 1366x768 seems too little.

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• How to disable all window borders from the VLC playback window

  - by Rob Thomas

  Is there a way to make the VLC playback window completely borderless (no title bar, no other borders)? Ideally, I would like the playback window to be completely borderless and then a separate window that has the controls (play, pause, timeline control, etc). UPDATES: I cannot use full screen mode, I would like playback window to be sized the same as the video, which is usually about 300x300 px. Also, I need to be able to position the window anywhere on the desktop. I'm using the Windows version of VLC.

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• Moving LiveMeeting admin functions to a different window

  - by Rob Farley

  I run a user group, and often host LiveMeeting sessions. I use a projector, with a crowd watching. How do I do the admin stuff (respond to Q&A, etc) on one window, and just have the video on the 'extended monitor'? I dont' want the people in the audience to see anything except the video feed, but I want to be able to watch questions come in, etc... Note: I don't have a problem extending the screen across the two monitors - I already have different stuff showing on my screen compared to the projector. I just want a way to put the LM video on Monitor 2 (projector), and the LM controls on Monitor 1.

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• Getting an boot error when starting computer

  - by Rob Avery IV

  I was in the middle of watching a movie on Netflix, then suddenly everything started crashing. First, explorer.exe closed down, then Google chrome. I had multiple things running in the background (Steam, Raptr, etc.). Individuality, each of those apps closed down also. When they did, a small dialog box popped up for each of them, one at a time, saying that it was missing a file, it couldn't run anymore, or something similar to that. It also had some jumbled up "code" with numbers and letters that I couldn't read. Ever since then, everytime I turn my computer on, it will run for a few seconds and give this error "Reboot and select proper boot device or insert boot media in selected boot device and press a key_". No matter how many times I try to reboot it, it always gives me the same error. A day later after this happened I was able to start the computer, but before it booted, it told me that I didn't shut down the computer properly and asked how I wanted to run the OS (Run Windows in Safety Mode, Run Windows Normally, etc.). Once I logged, everything went SUPER slow and everything crashed almost instantly. The only thing I opened was Microsoft Security Essentials and only got in about two clicks before it was "Not Responding". Then, after that the whole computer froze and I had to restart it. Now, it's back to saying what it originally said, "Reboot and select proper boot device or insert boot media in selected boot device and press a key_". I built this PC back in February 2012. Here are the specs: OS: Windows 7 Ultimate CPU: AMD 8-core GPU: Nvidia GTX Force 560 Ti RAM: 16GB Hard Drive: Hitachi Deskstar 750GB I'm usually very good taking care of my PC. I don't download anything that's not from a trusted site or source. I don't open up any spam email or such or go to any harmful websites like porn or stream movies. I am very clean with the things I do with my PC and don't do many DIFFERENT things with it. I use it pretty often especially for video games and doing homework in Eclipse. Also, good to note that I don't have any Norton or antisoftware installed. I have Microsoft Security Essentials installed but never did a scan. Thanks!

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• Smart card driven membership and door entry system

  - by Rob G

  I'm looking at putting in a smart card driven system at my local sports club (which doesn't have oodles of money), and since they're willing to pay for hardware, and I'm willing to do the technical setup, I was wondering if anyone had any experience in setting something like this up. Writing any software needed is not the problem, I've pretty much got that covered with various open source projects out there and custom code I'll write, but it's more the hardware side I'm not too sure about and I'm looking for advice from people out there. I'm sure there are numerous complications, but on the surface it looks fairly simple. I'd basically like to enable members to swipe/touch a smart card at the door to gain entry to the club, walk up to a touch screen PC and swipe/touch a card reader there to "login" to the system I create, which will allow them to book club facilities etc. I may even want that same card to then activate things like lights or music when they enter the room they've booked. Pretty Eutopian I know, but still, we'd like to get as close as we can. As I said, the software shouldn't be a problem, and on the hardware side, so far I'm looking at: All in one touch screen PC running Windows 7 or Ubuntu USB card reader (not sure which one to buy) Smart Cards (again, never bought these before) Door/lighting hardware that could be triggered (not sure here either) If anyone has any advice on implementing something like this - especially the items I'm not sure about above, and of course anything I've missed out that's crucial, I'd be most grateful. Recommended hardware that you've used for something like this would be fantastic!

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• Linux servers vs Windows IIS sense of usage "free" solutions

  - by Rob

  I wonder what is the sense of using "free" open source solutions for serious webstie applications? Crawled and read many testing of servers performance and there is one conclusion: IIS seems to be the best choice for high load applicatiom. I mean cost effective. Especially this concers to Nginx PLUS and LiteSpeed Users where subscriptions paid for e.g. LoadBalacer and extra support cost a lot in fact. I'm asking then where it's "free" then or "cheap" in this case? Assuming even little higher cost of dedicated servers with Windows still seems like Windows looks cheaper. At it's basic setup Windows 2012 with IIS offer much more than std LAMP, or other NGINX config.... Maybe am I missing sth ? I mean only general case for someone who did not already started his app. I know exactly that the cheapest solution is the one someone is skilled. Has anyone done already such real costs calculation for example scenarios?

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• Which PC components make the biggest impact on your compile times for Visual Studio?

  - by Rob Allen

  Which PC specifications have the biggest impact on your compile times? Disk? Clock speed? Number of CPU cores?

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• Can arbitrary email addresses be stored in AD userPrincipalName?

  - by Rob Potter

  I have a web app that is front-ended by ISA, natively authenticating against AD. All users currently log on with sAMAccountName. I would like to allow users to provide a personal email address and be able to authenticate against this instead. From what I understand the AD userPrincipalName is typically used for an internally generated logon name, which by convention, is often their internally generated email address. The web app that I have is web scale (circa 3 million accounts*) and not an internal, corporate app, so the email addresses will be from diverse domains. Can I just set the AD userPrincipalName attribute to the user's email address, and then will ISA natively authenticate against this attribute instead? I heard rumours of AD having a maximum number of domain suffixes that it allows in AD userPrincipalName...? (presumably it catalogues them). [*I realise that AD is not the ideal authentication directory for a user population of this scale.]

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• Looking for Kiosk-style / camera store easy photo memory card to CD/DVD burning program for Windows-7 Notebook? For non techie user.

  - by Rob

  I'm looking for a Kiosk-style / camera shop easy photo memory card to CD/DVD burning program? For non technie user. The kind of system you see in a camera shop / store, e.g. in the UK, Jessops and Boots stores. This is for my Dad who is adept at general PC usage as a notebook owner, but would prefer something fairly simple. The task of burning photos to CD/DVD, in their original photo file .jpg form, i.e. NOT as CD or DVD video or slideshow, is what I'm looking for. I'm guessing this might be possible in Picasa, but all the options available might be superfluous and confusing. He could probably learn to use that but thought I would try simpler options first. Looking for something that guides the user through the steps/stages of the process, 'Wizard' style. Any suggestions? Platform: HP Windows 7 Home notebook with CD/DVD burner and SD memory card slot.

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• Why do I have two different DNS suffix lists?

  - by Rob Kennedy

  My Windows XP laptop has two different DNS suffix lists. The first is the one I see by selecting the Properties dialog of any of my network connections, selecting Internet Protocol Properties Advanced DNS tab, and looking at the list under the "Append these DNS suffixes (in order)" option. The second list is the one shown under "DNS Suffix Search List" when I run ipconfig /all. As far as I can tell, only the second list ever gets used to resolve unqualified host names. Why are there two different lists? How do I configure the second list? Or how can I make my computer use the first list?

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