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Xen networking is inconsistent in multiple ways

- by WildVelociraptor

I've been running xen for a few weeks now on an Ubuntu 12.04 server. I've got 3 guests: a Windows Server 2003 guest, an Ubuntu guest, and a Windows 7 Guest. My Server 2003 guest seems to work fine; I can ping it from the network, the hostname resolves correctly, and it can see the internet. This guest is attached to xenbr0, and its IP is 10.100.1.21. My Win7 guest is what is driving me crazy. I use the same configuration script as a base, changing the important parts (hostname and boot disk, mainly). It installed correctly, and is currently running, but I am unable to ping this guest. It's hostname is "alexander", with an IP of 10.100.1.22. It is also using xenbr0. The guest can ping the firewall and various IP addressess, but seems unable to resolve hostnames. Now heres the weird part: when I use rdesktop (RDP client) from my laptop (not the xen host) to connect to alexander, it works just fine. It apparently resolves the hostname fine, and does the same with the IP address. So, can someone tell me why I can access this guest using RDP, but not using ping, nslookup, traceroute, etc? It's apparently invisible to all but RDP. Also, is it okay to use two guests on the same bridge, or do i need different ones for each guest? Thanks in advance for any help. Regards

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Does a Windows 7 dvd only have one language?

- by user326639

I'm a Dutch developer living in Spain. I recently composed a new computer from new parts and I installed Windows 7 Professional 64 bit (OEM) on it. On the web site of the on-line shop there was a note saying "language: Spanish". Because my English is quite a bit better than my Spanish, but mainly because it is much easier to find information on the web in English, I want my OS to be in English. I asked the on-line shop if they also sold the UK version of Windows 7 but they assured me that "all Windows 7 versions are multi-language". With the installation of XP a few years ago, I remember that I was offered the option English or Spanish while the installation process was still in the DOS-like (non-graphical) screen. While installing Windows 7, I did not see any non-graphical screen and the first time I was asked about the language, was in a drop-down list that contained only Spanish. I know about the language pack possibility of Windows 7, but this is not available on Professional. Even if I had Ultimate, I don't know if it would be possible to install Windows in Spanish, and then add English as a second language from a language pack. I get the impression that English has to be the base-language. Furthermore, I am a bit sceptical until I'd see it in action. What happens with shortcuts (i.e. Select All: ctrl-a in English / ctrl-e in Spanish, and what about logging messages in Event Viewer, etc) So can anybody tell me how it works with languages in Windows 7? Have I been misinformed by the computer shop? Could it be that OEM versions of Windows are single language an a full installation is not?

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Graphics and USB devices freezing soon after OS loads

- by Andrew

I run Ubuntu/Windows dual boot. Last night I started the upgrade to Ubuntu 12.04, and my computer has not worked since in either Windows or Ubuntu. Here's what I got when I rebooted after the upgrade, and continue to get every time I boot: Gets to GRUB screen OK. Choose Ubuntu - black screen or crazy purple lines. At first I assumed something went wrong with the upgrade (often happens). Choose Windows - works fine, I log in, but soon after that the graphics freeze (sometimes with purple artifacts). The keyboard and mouse (both USB) also lose power at the same instant, and none of the USB ports have power to them. This happens sooner or later every time I boot. Update: the HDD also appears to lose power at the same point. I have tried a live CD, but my computer refuses to boot any CD even after disabling all other boot options in the BIOS. I have disconnected everything except keyboard, mouse, graphics card with one monitor, one RAM sick and HDD; no change. I also took the little battery out to reset CMOS. I am pretty sure no matter how wrong the Ubuntu upgrade went, it wouldn't cause the above symptoms in Windows. So the only explanation I can think of is that a hardware failure occurred at the same time. Some possible causes of this I can think of are: A couple of days before this, I added a third screen (which worked fine). About a week before, my house lost power in a storm (no ill effects over the past few days though). What can I do, other than buy a new motherboard/CPU and hope it works? Unfortunately I don't have another box to swap parts into to test at the moment.

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Blender refuses to start

- by Sekhemty

I'm trying to run Blender under Linux, but I'm unable to do that, whenever I try I get some errors. I'm using Kubuntu 12.04 with KDE 4.11.1. This is my video card: ~$ lspci | grep VGA 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV610/M74 [Mobility Radeon HD 2400 XT] I used to have installed the fglrx proprietary Catalyst drivers, but lately they gave me some system-wide problems and I had to revert to the open source Mesa drivers (I don't think that these details are important, but just in case, the whole story is here). Whit the fglrx drivers Blender was running fine, but now, whenever I try to start it, I get this error message (some parts are in italian, but I think that they are easily understandable): ~$ blender connect failed: No such file or directory Writing: /tmp/blender.crash.txt Errore di segmentazione (core dump creato) The content of /tmp/blender.crash.txt is as follows: # Blender 2.68 (sub 5), Revision: 60150 # backtrace /usr/lib/blender/blender() [0x877a41f] [0xb7756400] /usr/lib/i386-linux-gnu/libLLVM-3.0.so.1(_ZN4llvm3ARM8SPRClassC1Ev+0x15) [0xa8f4a9d5] /usr/lib/i386-linux-gnu/libLLVM-3.0.so.1(+0x25ca48) [0xa8eefa48] /lib/ld-linux.so.2(+0xeeab) [0xb7765eab] /lib/ld-linux.so.2(+0xef94) [0xb7765f94] /lib/ld-linux.so.2(+0x12fa6) [0xb7769fa6] /lib/ld-linux.so.2(+0xeccf) [0xb7765ccf] /lib/ld-linux.so.2(+0x127f4) [0xb77697f4] /lib/i386-linux-gnu/libdl.so.2(+0xbe9) [0xb4ff9be9] /lib/ld-linux.so.2(+0xeccf) [0xb7765ccf] /lib/i386-linux-gnu/libdl.so.2(+0x133a) [0xb4ffa33a] /lib/i386-linux-gnu/libdl.so.2(dlopen+0x47) [0xb4ff9c97] /usr/lib/i386-linux-gnu/mesa/libGL.so.1(+0x3cbf0) [0xb7717bf0] /usr/lib/i386-linux-gnu/mesa/libGL.so.1(+0x4079d) [0xb771b79d] /usr/lib/i386-linux-gnu/mesa/libGL.so.1(+0x1a3aa) [0xb76f53aa] /usr/lib/i386-linux-gnu/mesa/libGL.so.1(glXQueryVersion+0x2e) [0xb76f0cee] /usr/lib/blender/blender(_ZN15GHOST_WindowX11C1EP15GHOST_SystemX11P9_XDisplayRK10STR_Stringiijj18GHOST_TWindowStatei25GHOST_TDrawingContextTypebbt+0x11c) [0x8f54aec] /usr/lib/blender/blender(_ZN15GHOST_SystemX1112createWindowERK10STR_Stringiijj18GHOST_TWindowState25GHOST_TDrawingContextTypebbti+0xd7) [0x8f4f4a7] /usr/lib/blender/blender(GHOST_CreateWindow+0xb6) [0x8f4cf86] /usr/lib/blender/blender(wm_window_add_ghostwindows+0x205) [0x8799be5] /usr/lib/blender/blender(WM_check+0x50) [0x877b670] /usr/lib/blender/blender(wm_homefile_read+0x111) [0x87859f1] /usr/lib/blender/blender(WM_init+0xd2) [0x8787872] /usr/lib/blender/blender(main+0xe6e) [0x873848e] /lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3) [0xb4e694d3] /usr/lib/blender/blender() [0x8778a99] The only thing that I can guess from this report is that the mesa drivers are somewhat involved, as I already suspected, but I don't have a clue on what I need to do to try to solve the issue.

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Ungrounded laptop (Macbook Pro) buzzes in headphones, weird feeling when fingers brush lightly

- by donut

I've got a nearly 3-year-old MacBook Pro 15" 2.16GHz (MacBookPro2,2). When I have am not using the extended, grounded adapter for the power supply, just using the simple, two-prong plug I can hear a buzzing when I use very sensitive earbuds. This goes away if I touch a metal part of the laptop. Also, I can feel a weird, fuzzy feeling when I brush the metal parts of the laptop lightly with my fingers/skin. Somewhat similar to feeling of a touching hair or a balloon that's charged with static electricity. But I'm not getting sparks or anything. And if I'm touching a metal part of my laptop solidly (not just brushing it) and then I touch someone else's skin I can feel the same effect and so can my victim. I've noticed similar effects with an ungrounded electric blanket. But with that the buzzing can be easily heard without headphones. Is this a defect, normal, or something else? And what exactly is happening?

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Moodle serves on IP only - will not work with mod_proxy

- by Jon H

I'm trying to set a moodle server up on an Ubuntu box, which already serves Plone & Trac via Apache. In my Moodle config I have $CFG-wwwroot = 'http://www.server-name.org/moodle' The configuration below works fine for the first two, but when I visit www.server-name.com/moodle I get: Incorrect access detected, this server may be accessed only through "http://xxx.xxx.xxx.xxx:8888/moodle" address, sorry It then forwards to the IP address, where Moodle functions fine. What am I missing to get the server name approach working correctly? Apache Config follows: LoadModule transform_module /usr/lib/apache2/modules/mod_transform.so Listen 8080 Listen 8888 Include /etc/phpmyadmin/apache.conf <VirtualHost xxx.xxx.xxx.xxx:8080> <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPreserveHost On <Location /> ProxyPass http://127.0.0.1:8082/ ProxyPassReverse http://127.0.0.1:8082/ </Location> </VirtualHost> <VirtualHost xxx.xxx.xxx.xxx:80> ServerName www.server-name.org ServerAlias server-name.org ProxyRequests Off FilterDeclare MyStyle RESOURCE FilterProvider MyStyle XSLT resp=Content-Type $text/html TransformOptions +ApacheFS +HTML TransformCache /theme.xsl /home/web/webapps/plone/theme.xsl TransformSet /theme.xsl FilterChain MyStyle ProxyPass /issue-tracker ! ProxyPass /moodle ! <Location /issue-tracker/login> AuthType Basic AuthName "Trac" AuthUserFile /home/web/webapps/plone/parts/trac/trac.htpasswd Require valid-user </Location> Alias /moodle /usr/share/moodle/ <Directory /usr/share/moodle/> Options +FollowSymLinks AllowOverride None order allow,deny allow from all <IfModule mod_dir.c> DirectoryIndex index.php </IfModule> </Directory> </VirtualHost>

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Postfix Postscreen: how to use postscreen for smtp and smtps both

- by petermolnar

I'm trying to get postscreen work. I've followed the man page and it's already running correctly for smtp. But it I want to use it for smtps as well (adding the same line as smtp in master.cf but with smtps) i receive failure messages in syslog like: postfix/postscreen[8851]: fatal: btree:/var/lib/postfix/postscreen_cache: unable to get exclusive lock: Resource temporarily unavailable Some say that postscreen can only run once; that's ok. But can I use the same postscreen session for both smtp and smtps? If not, how to enable postscreen for smtps as well? Any help would be apprecieted! The parts of the configs: main.cf postscreen_access_list = permit_mynetworks, cidr:/etc/postfix/postscreen_access.cidr postscreen_dnsbl_threshold = 8 postscreen_dnsbl_sites = dnsbl.ahbl.org*3 dnsbl.njabl.org*3 dnsbl.sorbs.net*3 pbl.spamhaus.org*3 cbl.abuseat.org*3 bl.spamcannibal.org*3 nsbl.inps.de*3 spamrbl.imp.ch*3 postscreen_dnsbl_action = enforce postscreen_greet_action = enforce master.cf (full) smtpd pass - - n - - smtpd smtp inet n - n - 1 postscreen tlsproxy unix - - n - 0 tlsproxy dnsblog unix - - n - 0 dnsblog ### the problematic line ### smtps inet n - - - - smtpd pickup fifo n - - 60 1 pickup cleanup unix n - - - 0 cleanup qmgr fifo n - n 300 1 qmgr tlsmgr unix - - - 1000? 1 tlsmgr rewrite unix - - - - - trivial-rewrite bounce unix - - - - 0 bounce defer unix - - - - 0 bounce trace unix - - - - 0 bounce verify unix - - - - 1 verify flush unix n - - 1000? 0 flush proxymap unix - - n - - proxymap proxywrite unix - - n - 1 proxymap smtp unix - - - - - smtp relay unix - - - - - smtp showq unix n - - - - showq error unix - - - - - error retry unix - - - - - error discard unix - - - - - discard local unix - n n - - local virtual unix - n n - - virtual lmtp unix - - - - - lmtp anvil unix - - - - 1 anvil scache unix - - - - 1 scache dovecot unix - n n - - pipe flags=DRhu user=virtuser:virtuser argv=/usr/bin/spamc -e /usr/lib/dovecot/deliver -d ${recipient} -f {sender}

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Linux Sound Drivers - Recompiling kernel with ehcd-hcd module

- by jhome

I just installed Linux Mint and I am trying to get my usb soundcard to work. I am completely new to Linux so I have only been learning about all the important parts of the OS this afternoon. No one I know has compiled kernel so I can't ask anyone. I am following instructions on this site: http://wiki.ubuntuusers.de/Benutzer/BigMc#Final-setup-of-US-122L-US-144 "Recompile your Kernel with ehcd-hcd as a module: Instructions for Ubuntu (german) Change "Device Drivers - USB support - EHCI HCD (USB 2.0) support)" to "M" when configuring. Make sure you also install the kernel headers." I know how to do any of these processes. Someone mentioned a package manager. Is recompiling basically in layman's terms reinstallation? Where do I go to the change device drivers? Cheers Edit: I am attempting to be able to use my Tascam US-144 on Linux Mint. Apparently, to use it properly it has to regress to functionality of a former unit (US-122), so according to the instructions a USB port has to be USB 1.0, rather than USB 2.0. I've tried using that ndis** programme for wireless drivers but with no success.

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Sun-JRE on CentOS-4.8 RPM error: post-install scriptlet failed, exit status 5

- by Emyr

I have a server with CentOS 4.8 installed. The provided is rubbish, but there's only a few months left, and they're busy being sued by Chase bank, so I doubt I can get CentOS 5. I wiped the server clean using Virtuozzo, and found that the default image is VERY empty. I even had to install yum myself. I've reached the point where I want to install TomCat. I downloaded the Sun JRE as a .rpm.bin file, did chmod a+x and ran it. That produced a .rpm file, which I tried installing: [root@host java]# rpm -Uvh jre-6u20-linux-i586.rpm Preparing... ########################################### [100%] 1:jre ########################################### [100%] Unpacking JAR files... rt.jar... jsse.jar... charsets.jar... localedata.jar... plugin.jar... javaws.jar... deploy.jar... error: %post(jre-1.6.0_20-fcs.i586) scriptlet failed, exit status 5 [root@host java]# rpm -qi jre Name : jre Relocations: /usr/java Version : 1.6.0_20 Vendor: Sun Microsystems, Inc. Release : fcs Build Date: Mon Apr 12 19:34:13 2010 Install Date: Thu May 6 06:36:17 2010 Build Host: jdk-lin-1586 Group : Development/Tools Source RPM: jre-1.6.0_20-fcs.src.rpm Size : 50708634 License: Sun Microsystems Binary Code License (BCL) Signature : (none) Packager : Java Software <[email protected]> URL : http://java.sun.com/ Summary : Java(TM) Platform Standard Edition Runtime Environment Description : The Java Platform Standard Edition Runtime Environment (JRE) contains everything necessary to run applets and applications designed for the Java platform. This includes the Java virtual machine, plus the Java platform classes and supporting files. The JRE is freely redistributable, per the terms of the included license. [root@host java]# I couldn't find any results on Google for any parts of that error message, and I have very little experience of rpm (I usually use Debian). Is this a broken package, or am I missing something or some setting?

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How harmful is a hard disk spin cycle?

- by Gilles

It is conventional wisdom¹ that each time you spin a hard disk down and back up, you shave some time off its life expectancy. The topic has been discussed before: Is turning off hard disks harmful? What's the effect of standby (spindown) mode on modern hard drives? Common explanations for why spindowns and spinups are harmful are that they induce more stress on the mechanical parts than ordinary running, and that they cause heat variations that are harmful to the device mechanics. Is there any data showing quantitatively how bad a spin cycle is? That is, how much life expectancy does a spin cycle cost? Or, more practically, if I know that I'm not going to need a disk for X seconds, how large should X be to warrant spinning down? ¹ But conventional wisdom has been wrong before; for example, it is commonly held that hard disks should be kept as cool as possible, but the one published study on the topic shows that cooler drives actually fail more. This study is no help here since all the disks surveyed were powered on 24/7.

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Intel D2500HN Atom D2500 Doesn't turn on

- by David W

I recently bought parts from Amazon to build an embedded PC, and have assembled everything. I have: Intel D2500HN Mini-ITX Motherboard Mini-Box Pico-PSU 80 M350 Universal Min-ITX Enclosure 2GB DDR3 Memory Kinamax AD-LCD12 LCD Monitors 12V 6A 72W AC Adapter Power Supply The motherboard gets a light (on the motherboard, not on the Pico-PSU) when I plug it into the power adapter. Furthermore, I see the power switch light come on when I press the power button. However, the display doesn't turn on, and it doesn't seem that the PC is actually turned on. Since I'm seeing these lights, I know that the motherboard is getting power. Furthermore, the display VGA port is embedded into the motherboard, so that's not the issue. I'm just trying to figure out what COULD be the issue aside from a faulty motherboard. I have a diagram of the D2500HN motherboard which labels everything, and have ensured that the power LED as well as the On/Off cables are plugged into the right spots, although to be sure I've tried flipping these two cables around, and also plugging 1 cable into the other cable's spot & vice-versa. Is there anything else you folks think I may be missing, or anything else I can do to try to troubleshoot this issue before sending the motherboard back?

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APC not caching many files

- by tetranz

Hello I have a Drupal site running on a VPS at Linode with PHP 5.2.10 and APC 3.1.6. It never caches more than about 25 files and barely uses any of its available memory. Drupal has hundreds of php files. I have another server where APC seems to work well and does indeed cache hundreds of files. The only difference with that site is that it runs Ubuntu 10.04 and php 5.3.2. The config settings are the same. What could be wrong? I'll paste the config from apc.php below. This is after hitting multiple parts of Drupal. Thanks APC Version 3.1.6 PHP Version 5.2.10-2ubuntu6.5 APC Host xxx.example.com Server Software Apache/2.2.12 (Ubuntu) Shared Memory 1 Segment(s) with 32.0 MBytes (mmap memory, pthread mutex locking) Start Time 2010/12/02 11:32:17 Uptime 3 minutes File Upload Support 1 File Cache Information Cached Files 21 ( 1.4 MBytes) Hits 169 Misses 21 Request Rate (hits, misses) 1.00 cache requests/second Hit Rate 0.89 cache requests/second Miss Rate 0.11 cache requests/second Insert Rate 0.17 cache requests/second Cache full count 0 User Cache Information Cached Variables 0 ( 0.0 Bytes) Hits 0 Misses 0 Request Rate (hits, misses) 0.00 cache requests/second Hit Rate 0.00 cache requests/second Miss Rate 0.00 cache requests/second Insert Rate 0.00 cache requests/second Cache full count 0 Runtime Settings apc.cache_by_default 1 apc.canonicalize 1 apc.coredump_unmap 0 apc.enable_cli 0 apc.enabled 1 apc.file_md5 0 apc.file_update_protection 2 apc.filters apc.gc_ttl 3600 apc.include_once_override 0 apc.lazy_classes 0 apc.lazy_functions 0 apc.max_file_size 1M apc.mmap_file_mask apc.num_files_hint 1000 apc.preload_path apc.report_autofilter 0 apc.rfc1867 0 apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.rfc1867_ttl 3600 apc.shm_segments 1 apc.shm_size 32M apc.slam_defense 1 apc.stat 1 apc.stat_ctime 0 apc.ttl 0 apc.use_request_time 1 apc.user_entries_hint 4096 apc.user_ttl 0 apc.write_lock 1

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Backup data rate on Raspberry Pi maxing out at 5 Mb/s. Why?

- by bastibe

I set up my Raspberry Pi as a Time Machine, as documented here. At the moment, the Raspberry Pi is connected to my MacBook Pro using a direct Ethernet cable. Also, an external hard drive (laptop drive) is connected to the Raspberry Pi using the USB port. However, backups are pretty slow. Activity Monitor claims that the Network is transferring a very steady 5 Mb/s, where my Time Capsule is transferring up to 8 Mb/s with a lot of fluctuation. The Raspberry Pi self-reports (top) that its CPU is only half-used, with about equal parts afpd, usb-storage and jbd2/sda1-8. Thus, I think that the processing power of the Raspberry Pi does not seem to be the problem here. To me, this looks like there is some kind of bottleneck that maxes out at 5 Mb/s thus potentially having my backups run at less than their potential speed. To the best of my knowledge, this might be the afp-daemon, the usb-bus or the external hard drive. So, my question is, how could I identify the true culprit and what can I do about it?

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get ubuntu terminal to send an escape sequence (control+shift+up)

- by user62046

This problem starts when I use emacs ( with -nw option). Let me first explain it. I tried to define hotkey (for emacs) as following (global-set-key [(control shift up)] 'other-window) but it doesn't work (no error, just doesn't work), neither does (global-set-key [(control shift down)] 'other-window) But (global-set-key [(control shift right)] 'other-window) and (global-set-key [(control shift left)] 'other-window) work! But because the last two key combinations are used by emacs (as default), I don't wanna change them for other functions. So how could I make control-shift-up and control-shift-down work? I have googled "(control shift up)", it seems that control-shift-up is used by other people, (but not very few results). In the Stack Overflow forum, Gille answered me as following: Ctrl+Shift+Up does send a signal to your computer, but your terminal emulator is apparently not transmitting any escape sequence for it. So your problem is in two parts. First you must get your terminal emulator to send an escape sequence, which depends on your terminal emulator, and is Super User material, or Unix.SE if you're using a unix system. Then you need to declare the escape sequence in Emacs, and my answer explains that part So I come here for this question: How do I get my terminal (I use ubuntu 10.04, and the built-in terminal) to send an escape sequence for Control+Shift+Up Control+Shift+down

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What folders to encrypt with EFS on Windows 7 laptop?

- by Joe Schmoe

Since I've been using my laptop more as a laptop recently (carrying it around) I am now evaluating my strategy to protect confidential information in case it is stolen. Keep in mind that my laptop is 6 years old (Lenovo T61 with 8 GB or RAM, 2GHz dual core CPU). It runs Windows 7 fine but it is no speedy demon. It doesn't support AES instruction set. I've been using TrueCrypt volume mounted on demand for really important stuff like financial statements forever. Nothing else is encrypted. I just finished my evaluation of EFS, Bitlocker and took a closer look at TrueCrypt again. I've come to conclusion that boot partition encryption via Bitlocker or TrueCrypt is not worth the hassle. I may decide in the future to use Bitlocker or TrueCrypt to encrypt one of the data volumes but at this point I intend to use EFS to encrypt parts of my hard drive that contain data that I wouldn't want exposed. The purpose of this post is to get your feedback about what folders should be encrypted from the general point of view (of course everyone will have something specific in addition) Here is what I thought of so far (will update if I think of something else): 1) AppData\Local\Microsoft\Outlook - Outlook files 2) AppData\Local\Thunderbird\Profiles and AppData\Roaming\Thunderbird\Profiles- Thunderbird profiles, not sure yet where exactly data is stored. 3) AppData\Roaming\Mozilla\Firefox\Profiles\djdsakdjh.default\bookmarkbackups - Firefox bookmark backup. Is there a separate location for "main" Firefox bookmark file? I haven't figured it out yet. 4) Bookmarks for Chrome (don't know where it's bookmarks are) and Internet Explorer ($Username\Favorites) - I don't really use them but why not to secure that as well. 5) Downloads\, My Documents\ and My Pictures\ folders I don't think I need to encrypt, say, latest service pack for Visual Studio. So I will probably create subfolder called "Secure" in all of these folders and set it to "Encrypted". Anything sensitive I will save in this folder. Any other suggestions? Again, this is from the point of view of your "regular office user".

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Building a Media Center PC with Comcast Cable...?

- by Rob

Alright - so this might be a stupid question but I've never been all that much into TV. I currently have Comcast cable. I've just got the 'basic' 2-60 package or whatever; I've just always plugged the cable into the back of my TV. I've never had a cable box. Recently, Comcast has been pulling channels off of my line-up. Most recently, the stole the TV Guide channel from me. I'm told this is part of a push to get customers to switch to their digital line-up. But, I'm also told it requires some sort of digital receiver for each TV you've got. I don't want to buy a bunch of these digital receivers and I don't want to pay the monthly rental fee...but I have heard of how awesome media center PCs are and some really cool things they can do. And, I've got loads of PC parts sitting around. So, can someone guide me through this a bit? Are there computer video cards or TV tuners that are going to work with Comcast's digital cable? What kind of price range are we looking at?

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Windows XP seemingly out of resources but plenty of free RAM and swap available

- by Artem Russakovskii

This one has been bothering me for years and so far I couldn't find an adequate solution. The problem occurs on pretty much every XP install I've done. After opening a variety of programs or the system running existing programs for a while, Windows seemingly runs out of resources, without telling me. There's ALWAYS free RAM. For example, it just happened to me and I had over a gig of free RAM. There are no viruses, spyware, or other nonsense - it is a Windows resource problem, but the question is which resource is it running out of, how does one pinpoint it, and how does one prevent it? Sometimes, this happens after running specific programs - for example, today it happened when I started Photoshop CS4 and Flash CS4 at the same time. I also noticed that restarting The Bat (email client by Ritlabs) seems to get rid of this problem for a while but again, this happens on machines that don't even have The Bat installed. So what does exactly happen? The symptoms are: pressing alt-tab doesn't bring up the list anymore - it just jumps to the next window instantly, very similar to the way Alt-Esc works, however in this case, it's due to not having enough resources to bring up the alt-tab menu random programs would randomly crash, citing random errors, out of memory errors, system resources, inabilities to do system calls, etc. random programs would start missing random parts - for example, Firefox top menus might disappear, pull up partial selections, or not pull up anymore altogether. IE might lose a few of its toolbars. Some programs might fail to redraw or would just plain go gray where the UI used to be. Windows itself never complains about running out of RAM, virtual memory, or anything at all, yet it's running out of something. The only clue I was able to find and apply the fix today was this Desktop Heap Limitation. I haven't confirmed the fix working as not enough time passed. In the meantime, what are everyone's thoughts?

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How harmful is a hard disk spin cycle?

- by Gilles

It is conventional wisdom¹ that each time you spin a hard disk down and back up, you shave some time off its life expectancy. The topic has been discussed before: Is turning off hard disks harmful? What's the effect of standby (spindown) mode on modern hard drives? Common explanations for why spindowns and spinups are harmful are that they induce more stress on the mechanical parts than ordinary running, and that they cause heat variations that are harmful to the device mechanics. Is there any data showing quantitatively how bad a spin cycle is? That is, how much life expectancy does a spin cycle cost? Or, more practically, if I know that I'm not going to need a disk for X seconds, how large should X be to warrant spinning down? ¹ But conventional wisdom has been wrong before; for example, it is commonly held that hard disks should be kept as cool as possible, but the one published study on the topic shows that cooler drives actually fail more. This study is no help here since all the disks surveyed were powered on 24/7.

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What permission(s) does an application pool identity required to manage other application pools?

- by Mr Shoubs

I have a web site (used to manage various parts of our software) that needs the permissions required to start/stop other application pools. I've created a user and set the app pool identity to custom, however the web app still can't start/stop the app pools. I get the following Error: System.UnauthorizedAccessException: Filename: redirection.config Error: Cannot read configuration file due to insufficient permissions at Microsoft.Web.Administration.Interop.AppHostWritableAdminManager.GetAdminSection(String bstrSectionName, String bstrSectionPath) at Microsoft.Web.Administration.Configuration.GetSectionInternal(ConfigurationSection section, String sectionPath, String locationPath) at Microsoft.Web.Administration.ServerManager.get_ApplicationPoolsSection() at Microsoft.Web.Administration.ServerManager.get_ApplicationPools() Discussion here suggests setting the application pool to local system or administrator, this does work, but I don't want to do this for security reasons (external support will need access this site). I did give the user higher permissions (as suggested here), starting by making it part of the local administrators group, but initially this didn't work, and giving the user read/write/mod permission on C:\Windows\System32\inetsrv\config also didn't work. I must have done something wrong as local administrator now works, however this still isn't what I want. So can anyone suggest the permissions I need to add to this user, and how can I apply them? An answer my problem (but different question) is here, but to clarify, I think I need to give an individual user "IIS Runtime Operation Permissions", does anyone know how to do this, if indeed this is the permissions I require?

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Falsification of an email sent from lotus notes

- by thejumper

I needed from a person an important email with an attachment (I give the person a fictious name here: Name familyname) . The person sent me an email in the format below (I changed the content but respected the format). In the email he sent me there is two parts, first below the email he sent, and after that above the answer he received. I told the person that he didn't give me the true information because the first part of the email is falsified. Please tell me what you think. Thanks a lot. From: abc efg To: Name familyname Date: 2012-03-09 12:14 AM Subject: Lorem ipsum dolor Nam dictum feugiat neque, euismod convallis mi euismod ut. Mauris at vulputate enim. Nunc posuere tortor vitae justo volutpat luctus. Sed ut ligula id magna dictum blandit id vitae erat. Nunc dignissim eleifend vulputate. 2012/3/4 Name familyname Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce aliquam ligula in elit blandit porta. Vestibulum facilisis, elit ut aliquam euismod, erat elit tempor mi, et pulvinar velit neque ac nibh. Nullam fringilla viverra erat sed laoreet. Aenean elementum enim ac elit ultricies luctus. Name Adress. Tel. Thanks for your help.

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Macs don't connect to wifi access point but PCs will

- by Josh

So, as a side project I'm going to try and figure out why the wifi APs in my building exhibit the following behavior: - They typically allow all types of computers to connect without issues - Sometimes Apples can't get an IP address but will still connect to the AP's signal - Less often, PCs can't connect to the wifi (same as above - yes signal, no IP addy) - Don't let Raiders fans on no matter the time of day! My first thought was that the DHCP leases were all taken up when the Apples would try to connect, and it was just their unlucky timing, but I would then try to log on with a PC that had a new, unleased MAC address and it would work... Could this be something to do with interoperability between an apple wifi card, and the APs? Different parts of the DHCP lease being taken up first? The fact that the Seattle Mariners might actually be good this year?? If this hasn't used up everyone's patience (with my crappy sports jokes), something else I could use some help with: - We don't have the model or type of AP - This is because there is no documentation available for them, and they literally look like small white boxes with no writing on them. Also, the company that installed them is out of business, so the situation might be that no docs will ever be on the way. -- Do you guys have any ideas on how to figure out what we have? Thanks as always for all the help, and I'm looking forward to the day when I know enough to start contributing back to the site, Josh

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Home server hard drive: 186k start-stop cycles in 325 days?

- by j-g-faustus

I set up a home server about a year ago, using Ubuntu server (10.04 LTS at the moment), four disks in RAID 5 for storage (WD Green 1.5 TB) and a laptop drive for the OS. Today the output of smartctl, a command line utility for checking the SMART attributes of a hard drive, tells me that the primary OS drive has had no less than 186,000 start-stop cycles in 325 days and may be nearing the end of its lifespan. The smartctl output is in "normalized values", in this case a number between 200 and 000, where 200 is "brand new" and 000 means "worn out". My disk gets 001. So I wonder what happened: 186k start/stop cycles in 7820 hours is about one start/stop per 2.5 minutes around the clock. This seems somewhat excessive for a computer that sees actual use once or twice per day. (The RAID disks are normal, averaging to one start/stop per day, as expected.) Does anyone have similar experiences, or pointers to what might be the issue here? Specifically I'd like to know Why the massive start/stop count? Do I have some sort of configuration issue? Could there be a background service that is causing trouble? Could having a laptop disk as the OS drive be part of the problem? Can anyone confirm or deny this? Here is the /etc/hdparm.conf configuration /dev/sda { apm = 127 spindown_time = 120 } and the most relevant parts of smartctl --attributes /dev/sda: smartctl version 5.38 [x86_64-unknown-linux-gnu] Copyright (C) 2002-8 Bruce Allen === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 001 001 000 Old_age Always - 185875 9 Power_On_Hours 0x0032 090 090 000 Old_age Always - 7820 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 109 193 Load_Cycle_Count 0x0032 118 118 000 Old_age Always - 246833 194 Temperature_Celsius 0x0022 107 098 000 Old_age Always - 36 As I generally prefer my drives to last more than a year, any advice is appreciated.

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VPN from Windows XP to OpenSwan: correct setup?

- by Gnudiff

Main question is what I am doing wrong in my OpenSwan or L2TP client setup? I am trying to create a Linux OpenSwan VPN connection from Windows XP machine, using preshared key and the builtin Windows XP L2TP IPsec option. I have followed the instructions in Linux Home networking Wiki for setting up OpenSwan and a guide to making it work with the Windows XP client, but am now stuck. The net setup is as follows: [my windows client, private IP A]<->[f/wall B]<-internet->[g/w X]<->[Linux OpenSwan server Y] A - private subnet /24 B - internet address X - internet address /24 Y - internet address on same subnet as X What I essentially want is for computer with A address to feel and work, as if it was in X subnet for purposes of outgoing and incoming TCP and UDP connections. My OpenSwan setup is as follows: /etc/ipsec.conf (AAA and YYY indicates ip address parts of A and Y addresses): conn net-to-net authby=secret left=B leftsubnet=AAA.AAA.AAA.0/24 leftnexthop=%defaultroute right=Y rightsubnet=YYY.YYY.YYY.0/24 rightnexthop=B auto=start the secret in /etc/ipsec.secrets is listed as: B Y : PSK "0xMysecretkey" where B & Y stand for respective IP adresses of gateway B and linux server Y My L2TP WinXP setup is: IP of destination: Y don't prompt for username security options: typical, require secured pass, don't require data encryption, IPSec PSK set to 0xMysecretkey networking options: VPN Type: L2TP IPSec VPN; TCPIP protocol (with automatic IP address assignment) and QOS packet schedulers enabled The error I get from Windows client is 789: "error during initial negotiation"

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Better approach to archiving large amounts of original video footage using optical media (DVD/Blu-ra

- by Rob

This question is to share my experience as well as ask for suggestions for better methods. Along with 2 friends, I completed the making of a short documentary film in 2006. Clip is at: http://www.youtube.com/mediamotioninvision The film was edited in Adobe Premiere Pro 1.5 on Windows XP. More details and screenshot here: http://www.flickr.com/photos/smilingrobbie/1350235514/ ( note this is not intended to be a plug, we've moved on from this initial learning curve project ;) ) The film is in 4:3 standard definition 720x576 PAL format. As well as retaining the final 30minute film, I wanted to keep all original files that assembled together to make the film. The footage was 83.5Gb So I archived them to over 20 4.7Gb DVD recordables in the original .avi format (i.e. data DVD-ROM format, NOT DVD-Video Mpeg2) Some .avi DV video files were larger than 4.7Gb so I used 7-zip to split them ( here is a guide as to how to do that: http://www.linglom.com/2008/10/12/how-to-split-a-large-file-using-7-zip/ ) To recombine them, a dos shell command like this would do that: copy /b file.avi.* file.avi would do the job, where .* is a wild card to include all the split parts e.g. 001, 002...00n assuming they are all in the same directory path folder. file.avi is the recombined file identical to the original. Later on, I bought a LG BE06 LU10 USB 2.0 Super-multi Blu-ray burner and archived the footage to 2 (two) x 50Gb BD-R DL discs. Again in the original format, written as files to a BD-R in the BD-R BD-ROM UDF format readable by PC/Mac etc, NOT Blu-ray video/film format. This seems to be a good solution for me, because: the archive is in a robust, reasonably permanent, non-volatile medium, i.e. DVD recordable / Blu-ray (debates about stability of optical media organic chemical dye compounds/substrates aside) the format of the archive is accessible by open source tools or just plain Windows Explorer and it's not in a proprietary format I just thought I'd ask folks for their experience on better methods, if such exist.

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download management

- by Jonathan

I download many files, usually 2 or 3 a day, often 10ish. Some of them are duplicates because I just can't be bothered to find the original in my downloads folder. I have previously tried DAP and used that to create a new subfolder for each day's download. yet I have found this insufficient as sometimes I wish to find files by name/file type or I have multiple parts of downloads over more than one day. Another problem I have found is zips/rars/etc after downloading them and extracting them I then have the zip and the folder. I like it like on a Mac where it automatically extracts the zip after it has been downloaded and removes the zip. What I'd like to be able to do is sort the downloads by date, but dynamically so they are just in the big downloads folder, but I can just press a button and it will show me all the files from a particular site, or from a particular day or by a certain file type. Is there any software that will do this? I use Chrome as a browser but also have Firefox and like that. Jonathan

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