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• Why TVs are costlier than Monitor for same screen size?

  - by Vikrant Chaudhary

  Just wondering, why LCD/LED-backlit TVs cost more (almost double) than LCD/LED-backlit monitors for same screen size. Because I guess that TVs and Monitors, both use almost same technologies and both nowadays support some common connectors (HDMI/D-Sub/DVI etc). And since a Monitor has much higher resolution than a TV for that size, and they are used more closely than TVs, Monitors probably require more engineering effort. So, Monitors are supposed to be costlier than TVs, right? Ex: A ViewSonic (or any) 22"/26" monitor supports Full-HD resolution at 1080p (WSXGA+-1680×1050, WUXGA-1920×1200), while all 22"/26" HDTVs support HD-ready 720p (WXGA-1366x768) only, which is also the resolution of my Notebook's 15.6" screen.

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• Application to store/browse/view photos?

  - by amorfis

  I am looking for application which I can install on Ubuntu server and put my photos there. It can be by web interface, it can be by mounted samba disk. What I require: Ability to add tags to photos. Ability to move photos. I.e. if I set photos directory to /home/photos, but then I want to move all photos to e.g. /home/common/photos - I don't want to lose all the tags. I used to use FSpot and it was great, but it lacked point 2, and I lost everything :(

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• (PHP) User is being forced to RE-LOGIN after trying to do something on an admin page

  - by hatorade

  I have created an admin panel for a client in PHP, which requires a login. Here is the code at the top of the admin page requiring the user to be logged in: admin.php <?php session_start(); require("_lib/session_functions.php"); require("_lib/db.php"); db_connect(); //if the user has not logged in if(!isLoggedIn()) { header('Location: login_form.php'); die(); } ?> Obviously, the if statement is what catches them and forces them to log in. Here is the code on the resulting login page: login_form.php <form name="login" action="login.php" method="post"> Username: <input type="text" name="username" /> Password: <input type="password" name="password" /> <input type="submit" value="Login" /> </form> Which posts info to this controller page: login.php <?php session_start(); //must call session_start before using any $_SESSION variables include '_lib/session_functions.php'; $username = $_POST['username']; $password = $_POST['password']; include '_lib/db.php'; db_connect(); // Connect to the DB $username = mysql_real_escape_string($username); $query = "SELECT password, salt FROM users WHERE username = '$username';"; $result = mysql_query($query); if(mysql_num_rows($result) < 1) //no such user exists { header('Location: login_form.php?login=fail'); die(); } $userData = mysql_fetch_array($result, MYSQL_ASSOC); db_disconnect(); $hash = hash('sha256', $password . $userData['salt']); if($hash != $userData['password']) //incorrect password { header('Location: login_form.php?login=fail'); die(); } else { validateUser(); //sets the session data for this user } header('Location: admin.php'); ?> and the session functions page that provides login functions contains this: session_functions.php <?php function validateUser() { session_regenerate_id (); //this is a security measure $_SESSION['valid'] = 1; $_SESSION['userid'] = $username; } function isLoggedIn() { if($_SESSION['valid']) return true; return false; } function logout() { $_SESSION = array(); //destroy all of the session variables if (ini_get("session.use_cookies")) { $params = session_get_cookie_params(); setcookie(session_name(), '', time() - 42000, $params["path"], $params["domain"], $params["secure"], $params["httponly"] ); } session_destroy(); } ?> I grabbed the sessions_functions.php code of an online tutorial, so it could be suspicious. Any ideas why the user logs in to the admin panel, tries to do something, is forced to re-login, and THEN is allowed to do stuff like normal in the admin panel?

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• Slow performance over network (Ubuntu)

  - by Filipe Santos

  i did setup this NodeJs TCP Server and tested it with a message flooder. Just to see how the performance of the server is. While the message throughput is great if i run the server and the message flooder on the same computer (ubuntu), the throughput dramaticaly decreases if i start the server on computer1(ubuntu1) and the message flooder on computer2(also ubuntu). Both PC are on the same network. In fact, they are directly connected to each other. I started searching the internet for reasons and i suppose i need to tune TCP on both Ubuntu-pcs but until now i haven't been successfull at all. Has anyone experienced such problems, or could someone help me out? Thanks Here the flooding code: var net=require('net') var client = net.createConnection(5000, "10.0.0.2") client.addListener("connect", function(){ for(var i = 0; i < 1000; i++) { client.write("message "); } })

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• Color Calibrate Dual Monitor XP SP2

  - by Laramie

  This topic has been touched on before but not really answered. I have a dual monitor system and the colors differ wildly. I currently live Buenos Aires where color correction hardware costs premium prices. I do some graphic design, but don't require a pro-level calibration. That said, I'd like my monitors to be set as close to "true color" as possible. I've located the useful and free Monitor Calibration Wizard, but it seems to adjust the entire system internally at startup. I could use the Microsoft Color Control Panel Applet to set a different ICC or ICM profile for each monitor, but the Monitor Calibration Wizard outputs its own format for profiles.

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• Keyboard doesn't let me press certain keys at the same time

  - by kitchen

  I'm not sure how to word the problem other than I can't use certain keys at the same time. For example, when playing games that require you to use the arrow keys to move and jump/duck I am unable to move to the left and jump (left arrow + up arrow) at the same time. As a result, I don't play many games when I get to a point where the jumps and what not are too far. This happens with other keys as well. In FPS I am unable to hold W to move forward and hit 2 to select my secondary weapon. Some information that might help you: I am using Windows 7 64-bit I am using a Micro Innovations KB565BL keyboard How can I fix this?

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• Interpreting Munin graphs showing available entropy and MySQL slow queries in sync

  - by user64204

  We're experiencing performance issues on our website, and after reviewing our munin graphs, the only metrics we've found in sync are Available entropy and MySQL slow queries, with the latter influenced by our number of logged in users: Based on the wikipedia entropy page, my understanding is that entropy is the amount of randomness (here measured in bytes) that the system can use for various tasks, mainly cryptography and functions that require random input. Since the peaks in available entropy and MySQL slow queries are occurring in sync and at regular interval, that the number of MySQL slow queries is proportional to our number of Drupal users whereas the peaks in available entropy seem to be much more constant and less proportional to these 2 metrics, we're thinking available entropy is the reflect of a root cause which, combined with the traffic to our website, is causing those slow queries (and not the opposite, slow queries influencing the entropy). Accordingly: Q: What underlying problem do you think could cause regular peaks in available entropy that could have an influence on MySQL's ability to process queries?

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• Windows Malicious Software Removal Tool log says it can't do all required actions. Should I be conce

  - by Tom

  Here's what the log file c:/Windows/debug/mrt.log of my Windows 7 install says: WARNING: Security policy doesn't allow for all actions MSRT may require. ->Scan ERROR: resource process://pid:6080 (code 0x00000005 (5)) ->Scan ERROR: resource process://pid:5300 (code 0x00000057 (87)) ->Scan ERROR: resource process://pid:3512 (code 0x00000057 (87)) I use the default setup. I didn't change anything. This is the first time I checked the log file and this warning is in there from the start. Can I do something about it? Or I shouldn't be concerned, because it can do everything what's necessary anyway? Do you have this warning in your logfile?

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• When using TCP load balancing with HAProxy, does all outbound traffic flow through the LB?

  - by user122875

  I am setting up an app to be hosted using VMs(probably amazon, but that is not set in stone) which will require both HTTP load balancing and load balancing a large number(50k or so if possible) of persistant TCP connections. The amount of data is not all that high, but updates are frequent. Right now I am evaluating load balancers and am a bit confused about the architecture of HAProxy. If I use HAProxy to balance the TCP connections, will all the resulting traffic have to flow through the load balancer? If so, would another solution(such as LVS or even nginx_tcp_proxy_module) be a better fit?

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• Boot time virus scan from USB drive

  - by Tomas Sedovic

  I want to check for viruses on a computer that I suspect may be infected with malware. Its users are running an antivirus, but there's always the risk that something slips past and the way I see it, once the system is infected the antivirus is useless because the malware can hide itself from the AV. I think the best way to go (besides clean reinstall of the OS) would be to have an antivirus running at a boot time from a CD or a USB key. That way, the malware is just lying on the disk and cannot do any of its hide-and-seek stuff (provided the AV comes from an uninfected PC and all that). So, I'm looking for something that: Runs at boot time (off USB key or CD-ROM) Does not touch or require the local OS Discovers malware fairly well (like, Avast, AVG, Norton, whatever -- I think the're all the same anyway) Can handle Windows filesystems (FAT 32, NTFS, WinFS ;-) ) Comes from some sort of trusted source (no Windows Antivirus 2009) I know that this is no silver bullet (nothing is, really*), but I do have a feeling it's more likely to help than doing the scan* within the infected system.

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• Segfault with rtorrent on Debian Lenny

  - by digital

  Hi, My debian lenny server keeps segfaulting with rtorrent, it happens once every 24 hours. Libcurl has been recompiled to the latest version and it still seems to happen. I'm not the best when it comes to linux server admin but if you require more info about the system I'll try and get it for you. lib/rtorrent are 0.8.5/0.12.5 Any help would be appreciated as I'd like rtorrent up 24/7 Caught Segmentation fault, dumping stack: 0 rtorrent [0x439686] 1 rtorrent [0x43e06a] 2 /lib/libc.so.6 [0x7f73ce780f60] 3 /usr/lib/libcurl.so.4 [0x7f73d04f4431] 4 /usr/lib/libcurl.so.4 [0x7f73d04f47da] 5 /usr/lib/libcurl.so.4(curl_multi_remove_handle+0x341) [0x7f73d050acb1] 6 rtorrent [0x480221] 7 rtorrent [0x482915] 8 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1f95] 9 /usr/local/lib/libtorrent.so.11 [0x7f73d02b1fea] 10 /usr/local/lib/libtorrent.so.11 [0x7f73d02b4cfc] 11 rtorrent [0x48058a] 12 rtorrent [0x439f49] 13 /lib/libc.so.6(__libc_start_main+0xe6) [0x7f73ce76d1a6] 14 rtorrent(_ZNSt8ios_base4InitD1Ev+0x71) [0x40ea99]

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• Blocking ports on the public IP assigned to lo interface in GNU/Linux

  - by nixnotwin

  I have setup my Ubuntu server as a router and webserver by following the answer given here. My ISP facing interface eth0 has a private 172.16.x.x/30 ip and my lo interface has a public IP as mentioned in the answer to the question linked above. The setup is working well. The only snag I have experienced is that I could not find a way to block the ports exposed by the public IP on the lo interface. I tried doing iptables -A INPUT -i eth0 -j DROP, and my server lost connectivity to the public network (internet). I could not ping any public ips. What I want is a way to block ports that are exposed by the public ip on the lo interface. And also I require iptables rules that can expose ports like 80 or openvpn port to the public network.

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• Sending mail to local address crashes web server (sendmail)

  - by deceze

  When trying to send mail automatically from a script at example.com via PHP's mail() to [email protected], the Apache server throws an Internal Error. I believe internally it is configured to use sendmail. The message gets dropped into ~/dead.letter and the general error log reads: [Wed May 12 11:26:45 2010] [error] [client xxx.xxx.xxx.xxx] malformed header from script. Bad header=/home/example/dead.letter... S: /home/example/www/test.php Trying any other address, not @example.com, works just fine. I have googled and serverfaulted for solutions, but they all require to edit configuration files in /etc/mail and similar system places, which is not an option, since this problem occurs on a shared host in which I only have access to ~/. Does anyone have a suggestion?

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• issue using Postfix as authen SMTP client relay to Exchange 2010

  - by Gk

  Hi, I'm using postfix to relay mail to Exchange 2010. Here is my config: relayhost = [smtp.exchange.2010] smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/relay_passwd smtp_sasl_security_options = #smtp_sasl_mechanism_filter = ntlm (/etc/postfix/relay_passwd contains login information of some accounts on Exchange) With this configuration I can relay email to Exchange. The problem is: the message send from Postfix has header: X-MS-Exchange-Organization-AuthAs: Anonymous and the message is treated like unAuthenicated message on Exchange system (i.e when sending to distribution group require senders are authenicated, I received error: #550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##rfc822;[email protected]). I using Outlook with the same account as in Postfix and it can send without problem. The different I realized between two case is: Outlook send with NTLM auth mech, Postfix using LOGIN mech. Any idea?

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• Can't Access a file I downloaded since I don't have permissions yet I am admin?

  - by chobo2

  Hi I downloaded some file and everytime I try to copy it or move it somewhere I get these errors Windows cannot access the specified device, path , or file. You may not have the appropriate permissions to access the item. You need permission to perform this action You require permission from "user(where this is my pc name/myusername)" to make changes to this file. Yet I am an admin and it is my only account on this computer and it saying to me I need permissions to open it up from "chobo2" user yet that's the account I am logged in as. I don't get it. How do I disable this stupid message so I can access every file I want. I am using windows 7 ultimate 64bit. As far as I know I have full permissions set so I don't know why I am getting this.

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• Is there a network "tee"-alike with one leg returning to /dev/null ?

  - by Steff Davies

  I've just built a new PostgreSQL server for my employers, which is happily replicating using WALs. I'm now left with the problem of verifying its performance. One nice way which came up in conversation is to break replication with the slave caught up and then direct all production traffic to both servers, discarding the responses from the new server and returning those from the current one to the clients. Once we're sure performance is OK, we re-sync the slave and can fail over with confidence. Bliss. This would require a TCP proxy capable of opening two outgoing connections for each incoming one, and discarding the data returned from one of them, which is a tricky thing to google for, it seems. Do the assembled brains know of such a thing, before I dive into libevent and write one?

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• Puppet apache module causing 'Error 400 on SERVER: Invalid parameter identifier'

  - by Andy Shinn

  I am receiving the following error when trying to use the latest puppetlabs-apache module from github (https://github.com/puppetlabs/puppetlabs-apache): Error: Could not retrieve catalog from remote server: Error 400 on SERVER: Invalid parameter identifier at /etc/puppet/environments/apache_update/modules/apache/manifests/mod.pp:40 on node zordon.mydomain.com Warning: Not using cache on failed catalog Error: Could not retrieve catalog; skipping run My node config looks like: node 'zordon.mydomain.com' { include template::common include template::puppetagent include template::lamp User::Create sudo::conf { 'joe': priority = 60, content = 'joe ALL=(ALL) NOPASSWD: ALL', require = User::Create['joe'], } } The template::lamp class is what uses apache module: class template::lamp { include myfirewall Firewall Firewall class { 'apache': } class { 'apache::mod::php': } class { 'apache::mod::ssl': } class { 'mysql::server': } } It looks like serverfault markup is getting garbled on Puppet realize statements. The User::Create and Firewall lines are just realizing a user and 2 firewall rules. I have verified that the /var/lib/puppet/lib/puppet/type/a2mod.rb type has the identifier parameter and it is the same MD5 as the server. I am using Puppet 3.0.1 on both agent and master. Any idea what may cause this?

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• Debian date jumping, causing complete lockup

  - by artfulrobot

  I have a Debian Squeeze VM that has suddenly chosen to jump it's date forwards just over a month, which seems to confuse it no end and cause it to require a hard reset (yikes!). There is nothing unusual in the logs, except that the datestamp suddenly jumps (today back to 2005). It's happened three times, so I don't think it's to do with the leap second issue as the last one of those was in July. When it happened once I spent ages checking stuff but could not find anything, decided to forget it. But three times is becoming an issue on a production server. Edits providing information requested in comments (thanks!): I do not have control over the hypervisor, it is a hired VM. # cat /sys/devices/system/clocksource/clocksource0/current_clocksource kvm-clock # ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== +grendel.exizten 130.149.17.8 2 u 29 64 77 14.811 1.778 1.744 *panoramix.linoc 193.67.79.202 2 u 32 64 77 19.729 -0.419 1.691 +robert.elnounch 213.251.128.249 2 u 27 64 77 17.762 0.600 1.722 -janetzki.eu 83.169.43.165 3 u 31 64 77 27.214 3.575 1.638

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• *nix OS that is easy to update to latest software

  - by rjstelling

  I need to configure a server (*nix) that runs our (bespoke) CMS and Applications. In the past I have defaulted to using Cent OS 5, but I find this outdated difficult to upgrade the software to the versions we require. For example, we need PHP 5.3, but CentOS 5 has 5.2. Updating is fine but breaks something else (normally MySQL support in PHP). Eventually it will get to a situation where I can't upgrade because of missing dependancies and incompatible versions. Error: Missing Dependency: httpd = 2.2.3-43.el5.centos.3 is needed by package httpd-devel-2.2.3-43.el5.centos.3.i386 (updates) Is there a better alternative OS for hassle free updates, I need: Apache 2.2.17 (the development version for apxs) MySQL 5.5.8 PHP 5.3.5

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• Backup Linux Root Partition (Fedora 12)

  - by SomeNewbie

  I setup my partition scheme to have an extra partition the size of my / partion. I have a separate home directory partition. Essentially, I will be doing things that might make my OS unstable so I'd like to backup the OS state but without bothering my home directory. Can I just backup (maybe with dd?) my root partition to another partition on the HDD? I know to restore it I would have to boot up with a livecd or something and do the reverse procedure. I want this to be as simple and require the least amount of external hardware as possible.

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• How to protect an OS X Server from an anautorized physical connection?

  - by GJ

  Hi I have an OS X 10.6 server, which I administer via SSH and VNC (via SSH tunnel). I can't leave it at the login window since then VNC connections are refused. Therefore I currently leave it logged with my user account. Since it doesn't have a monitor attached, it doesn't go into screen saver mode, which means it doesn't require a password to retake control. This means it is very easy for anyone connecting a keyboard/mouse and monitor to take control of the system. The screen saver password protection, which I can't get to activate, unlike the system's login window, is perfectly compatible with VNC connections. How could I prevent such direct access to the server without connecting a monitor and without blocking my ability to connect with VNC? Thanks!

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• How can I lock my Mac when I walk away?

  - by schnapple

  This has got to be an easy, trivial question but as a new Mac user, how can I lock my Mac when I walk away? On Windows this is dead simple - Win+L. Or hit Ctrl-Alt-Del and select "Lock this Computer" The best thing I've found for the Mac is to rig the screensaver to require password on wake, set a hot corner to fire off the screen saver, and do that as I leave. Which feels really "Windows 3.1" to me. Is there a Win+L-style method to quickly lock my Mac when I walk away?

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• How do I enable mutual SSL in IIS7 with a self-signed certificate?

  - by Kant

  I've created a self-signed certificate in IIS7. Then I exported this certificate to a .pfx and then installed it on the client machine's IE browser. Then I set "Require Client Certificate" on the server's IIS configuration. When I try to visit the site with IE, a dialog box comes up for me to choose a certificate, however, there are no certs in that dialog box. When I click "OK" without choosing any certs, I get a 403 forbidden error. How can I make this work? Appreciate the help in advance.

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• Apache ProxyPass ignore static files

  - by virtualeyes

  Having an issue with Apache front server connecting to a Jetty application server. I thought that ProxyPass ! in a location block was supposed to NOT pass on processing to the application server, but for some reason that is not happening in my case, Jetty shows a 404 on the missing statics (js, css, etc.) Here's my Apache (v 2.4, BTW) virtual host block: DocumentRoot /path/to/foo ServerName foo.com ServerAdmin [email protected] RewriteEngine On <Directory /path/to/foo> AllowOverride None Require all granted </Directory> ProxyRequests Off ProxyVia Off ProxyPreserveHost On <Proxy *> AddDefaultCharset off Order deny,allow Allow from all </Proxy> # don't pass through requests for statics (image,js,css, etc.) <Location /static/> ProxyPass ! </Location> <Location /> ProxyPass http://localhost:8081/ ProxyPassReverse http://localhost:8081/ SetEnv proxy-sendchunks 1 </Location>

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• UPS for hard drive protection

  - by dimi

  I am in a place where electricity is not ideal (old house, no ground), sometimes it occasionally shuts down and supposedly there are some spikes. I consider using UPS with the goal to increase safety of my personal data. My first priority is the health of my internal and external USB hard drives which can be damaged due to possible power instability. I do not care that much about possible losses of not-saved work, instead I just want to let my system have a minimum time to turn off without any risk of physical damaging my hard drives. Would a cheap offline UPS suit my neads? Or do i need a better one with automatic voltage regulator (AVR)? How critical is AVR for the hard drives? The external ones require their own power supplies and will be plugged directly into UPS.

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