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Articles indexed in November 2013

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  • Allowing ssh in iptables

    - by sat
    I am doing iptables firewall configuration. Actually, I need to allow ssh connection only from particular IP. But, It is blocking the ssh connection. I used the below commands. sat:~# iptables -F sat:~# iptables -A INPUT -p tcp -s src_ip_address -d my_ip_address --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT sat:~# iptables -A INPUT -j DROP sat:~# iptables -nL Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT tcp -- src_ip_address my_ip_address tcp dpt:22 state NEW,ESTABLISHED DROP all -- 0.0.0.0/0 0.0.0.0/0 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination If I try to connect from src_ip_address to my_ip_address, it is blocking the connection. Even, It is blocking from my_ip_address to src_ip_address . I haven't put any rules for OUTPUT chain. What is wrong with my commands? How to allow ssh in iptables?

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  • management network to a network port for additional ones munin and monit

    - by paolo
    management network to a network port for additional ones munin and monit I want to build a separate Netzwek for server management. I have several network cards a linux / debian / ubuntu with computer. Set both network cards sin in the /etc/network/interfaces. # The primary network interface #allow-hotplug eth0 #iface eth0 inet dhcp auto eth0 iface eth0 inet static address 10.0.0.240 netmast 255.255.255.0 network 10.0.0.0 brodacast 10.0.0.255 gateway 10.0.0.254 auto eth1 iface eth1 inet static address 10.0.10.240 netmast 255.255.255.0 network 10.0.10.0 brodacast 10.0.10.255 post-up ip route add 10.0.0.0/24 dev eth0 src 10.0.0.240 table eth0-WAN post-up ip route add default via 10.0.0.254 table eth0-WAN post-up ip route add 10.0.10.0/24 dev eth1 src 10.0.10.240 table eth1-LAN post-up ip route add default via 10.0.10.200 table eth1-LAN post-up ip rule add from 10.0.0.240 table eth0-WAN post-up ip rule add from 10.0.10.240 table eth1-LAN still i adjusted / etc/iproute2/rt_tables and following routes set up in the /etc/network/interfaces I want to have both applications and the network interface separately as munin and monit only on eth1 and not have to eth0. it goes to the reboot but sometimes not always. # Traceroute-i eth1 10.0.10.200 not go what am I doing wrong?

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  • How could Load average numbers from 'htop' exceed 100% CPU utlization?

    - by Joe Huang
    I use 'htop' to monitor my web server. It's recently quite loaded and the Load average is showing something like this: Load average: 3.10 2.56 1.63 I searched the web about these numbers and I found an article about it: http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages In the article, it says if I have 2 CPUs, 2.0 means 100% CPU utilization. And my VPS has two CPUs, so what does 3.1 mean? How could it exceed 100% CPU utilization? And from these numbers, does it mean I should be wary about the loading now? But the performance seems totally fine, and this is a managed VPS, the hosting company has not notified me any warning about it. During day time, Load average always show these high numbers... here is another snapshot while writing. Load average: 3.03 2.77 1.97 Load average: 0.41 1.29 1.60 <---- 5 more minutes later So I am wondering how much room left for this site to grow in current configurations? What kind of proactive actions I should take in advance? I don't want to wait until the server bursts. Thanks.

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  • configs for several sites in apache with ssl

    - by elCapitano
    i need to secure two different sites in apache. One of them should only be a proxy for a different server which is running on port 8069. Now one (which is natively included in apache) runs with SSL: <VirtualHost *:443> ServerName 192.168.1.20 SSLEngine on SSLCertificateFile /etc/ssl/erp/oeserver.crt SSLCertificateKeyFile /etc/ssl/erp/oeserver.key DocumentRoot /var/www/cloud ServerPath /cloud/ #CustomLog /var/www/logs/ssl-access_log combined #ErrorLog /var/www/logs/ssl-error_log </VirtualHost> The other one is not running and even not registered. When i try to access it, i get an exception (ssl_error_rx_record_too_long): <VirtualHost *:443> ServerName 192.168.1.20 ServerPath /erp/ SSLEngine on SSLCertificateFile /etc/ssl/erp/oeserver.crt SSLCertificateKeyFile /etc/ssl/erp/oeserver.key ProxyRequests Off ProxyPreserveHost On <Proxy *> Order deny,allow Allow from all </Proxy> ProxyVia On ProxyPass / http://127.0.0.1:8069/ ProxyPassReverse / http://127.0.0.1:8069 RewriteEngine on RewriteRule ^/(.*) http://127.0.0.1:8069/$1 [P] RequestHeader set "X-Forwarded-Proto" "https" SetEnv proxy-nokeepalive 1 </VirtualHost> My whish is the following configuration: 192.168.1.20 ->> unsecured local path to website 192.168.1.20/cloud/ ->> secured local documentpath from cloud 192.168.1.20/erp/ ->> secured proxy on port 80 for http://192.168.1.20:8069 how is this possible? is this even possible? perhaps cloud.192.168.1.20 and erp.192.168.1.20 is better?! Thank you

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  • Vagrant doesn't detect chef-solo unless re-installed

    - by nightowl
    I am using Vagrant to test my Chef recipes in Amazon AWS, and I am encountering an irritating issue: I initially assumed that Vagrant would install chef itself (as it does when using Virtual Box as the provider) but it seems that this needs to be done using the cloud-init script. However, even after I successfully installed the chef gem via cloud-init I was still getting the following error: The chef binary (eitherchef-soloorchef-client) was not found A quick google of this error suggested three probable causes: Chef had failed to install It had installed, but the directory was not in the $PATH environment variable It had installed and in the $PATH but with incorrect permissions I logged in and double checked; chef-solo and chef-client were installed; The path variable for the user, sudo and root all included /usr/local/bin and permissions were all fine. I managed to solve this problem by uninstalling and reinstalling the gem using sudo gem install chef. I don't understand why this should resolve the issue and it is a bit of a problem if I have to ssh into a test box and manually install the gem every time. Does anyone have any suggestions why this might be happening?

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  • Cisco ASA site-to-site vpn not initiating phase 1 (not sending udp 500 packets)

    - by Sean Steadman
    I am hoping someone here can help me with my problem. I am trying to setup an IPSEC site-to-site VPN between two cisco ASA 5520's in GNS3 (both using 8.4.2). I have been unsuccesful in getting the tunnel up and it appears neither ASA is sending packets out,in regards to phase 1 and phase 2 (tested by using wireshark and seeing NO udp 500 packets). Doing show ipsec sa and such shows nothing. CALIFORNIA(config)# show ipsec sa There are no ipsec sas FLA-ASA# show ipsec sa There are no ipsec sas I will attach both configurations in two different pastebin files as to keep this post a bit cleaner. Essentially California side has 172.20.1.0/24 and Florida side has 10.10.10.0/24. California ASA config: http://pastebin.com/v0pngYzF Florida ASA config: http://pastebin.com/E2geybta Please let me know if there is any other vital information that could help. I have gotten IPSEC tunnels to work using openSwan (linux) and cisco routers but cannot for the life of me get ASA IPSEC tunnels to work. The ASDM is out of the question I only use cli. Thanks for any useful help!

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  • how to manage credentials/access to multiple ssh servers

    - by geoaxis
    I would like to make a script which can maintain multiple servers via SSH. I want to control the authentication/authorization in such a manner that authentication is done by gateway and any other access is routed through this ssh server to internal services without any further authentication/authorization requirements. So if a user A can log into server_1 for example. He can then ssh to server_2 without any other authentication and do what ever he is allowed to do on server_2 (like shut down mysql, upgrade it and restart it. This could be done via some remote shell script). The problem that I am trying to solve is to come up with a deployment script for a JavaEE system which involves databases and tomcat instances. They need to be shutdown and re-spawned. The requirement is to have a deployment script which has minimal human interaction as possible for both developers and operation.

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  • Getting ajaxterm to work on Debian Lenny

    - by Kevin Duke
    I've been knocking my head out for a while on this one and have read many tutorials, but I just can't get this to work. Ajaxterm, is a webbased SSH client; once installed apt-get install ajaxterm and then enabling it with /etc/init.d/ajaxterm start I should be able to access the SSH terminal with http://mywebsite:8022/ But doing so only gives me a "Page not found", any suggestions? My actual VPS is: http://173.244.205.160 My sources: https://secure.kitserve.org.uk/content/setting-ajaxterm-Ubuntu-and-Debian-powerpc http://wiki.kartbuilding.net/index.php/ajaxterm

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  • Break a hard link of a file in use

    - by Stebi
    I used hard links to merge duplicated files on my SSD (space is still precious) and now have a weird problem. Common files like msvcr110.dll got hard linked. Now I want to delete a program which has this file in its installation directory. But I cannot because this file (on another location) is used by a currently running application (don't know which) and windows doesn't allow me to delete this file because it's in use. I can rename the file but it still points to the same file, so not possible to delete it. Is there any way to break a the hard link of a file which is currently in use? I currently use a trash folder where I move those files to so I can delete the directory structure of program to be deleted. But I'd like to get rid of this leftover (although it doesn't take much space as it's a hard link).

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  • Need advice on PC components for high-end games but in limited budget

    - by Md Atif
    I need advise, I want to buy PC components which will be good for gaming as well as be under my budget. First thing I chose is Graphics card : ATI HD 7850 2GB DDR5 then matching things up with this selected following: Processor: AMD 3.5 GHz AM3 FX 8320 8 Core Piledriver Mobo: MSI 990FXA-GD65 RAM : 8GB DDR3 (4x2) Is this setup looks compatible? If making any of above component inferior will have negligible affect on performance/gaming(like buying 970 chip mobo instead of 990) then please let me know so I can save some money :) ? Any other advice?

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  • How can one make vim change terminal colors?

    - by amn
    I am using command line vim running from an xterm (which runs sh). I have color in vim according to a color scheme I like. The problem is, as usual with 256-color terminals and truecolor color schemes, colors are wrong. Now, I know I can do a gazillion things to fix this, including installing gvim, but I like my terminal. In fact, using xrdb [-merge] .Xresource file, I now actually have xterm override the color values, and the theme now looks perfect. Since, I may be switching to another theme, I need some workflow to have vim actually do what xrdb does - to reset terminal color pallette. Because right now I have to reset color values with xrdb ... first, then launch another xterm to actually use these values, then launch vim from that newly opened xterm to have the exact colors. The way I understood it is that vim color scheme, just as any other terminal application, uses colors by referencing their ids, and X resources set the values themselves. I think I saw somewhere on Internet, that terminal control character sequences can reset actual color values, in fact, I am sure they can - I managed to set my terminal background color at runtime. How would I make vim execute these sequences to match values for the color scheme? And is there any reference to these control sequences, as part of any standard?

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  • How to gain admin privileges on D-Link router if my isp is not allowing me to do so?

    - by Fischer
    So I switched to new ISP yesterday, they gave me a D-Link router, can't use my old router. I want to change the wireless password, went to 192.168.1.1, I can login with the the username and password user user, but not as admin. On the catalog it says that the default username and password are admin admin, tried that didn't work. Tried admin and no pass, tried many combinations, none worked. I asked some other users and they said that the isp is blocking the users from logging in as admins, and blocking the reset button, and said that there's a hack where you do something like: cmd telnet "router ip" and do something like dumpcfg. Could you please give a better explanation on how to gain admin privileges on your own router if your isp is not letting you do so by default?

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  • Remove Write Protection from USB

    - by Vasile Marian Falama?
    My flash USB is write protected and I've tried every possible methods I've encountered over the internet, to get rid of this. Accessing the usb is not working. Format from my computer, is not working. Clear attributes with DiskPart is not working (can't be cleaned, Current Read-only State is Yes but Readonly is set to false... With Disk Management, I can't delete the partition... Is there any other method... With a specific software or somehow? Edit : I tried this on Windows 8.1.

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  • Elapsed time display in foobar 2000

    - by tripleowl
    The elapsed and total time display in Foobar 2000 with the Metro skin (download here) I use, is not aligned properly. I can't see the minutes track has played, which comes first. The time to the right of the track name is chopped. However on the seekbar it is ok. Click for a full sized image There are scripts in the ELPlaylist settings window which I get when I right click on the playlist window. But unfortunately I don't know which parameter if any in the script should be changed to set a proper time format for the track duration, which would allow me to see the elapsed time. Relevant ELplaylist code Track list Groupheader Per second

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  • Font name used in files shared between OSX and Windows

    - by Paul
    Our designer uses OSX, and creates InDesign or AI files. They are then passed to us for changes. When we open the files on Windows, we are told that fonts are missing. In this example, the Futura font is being used. The Windows machine has Futura installed, from BitStream. The nane of the font is "Futura Std", whereas on OSX, it is simply Futura. So InDesign chooses a random font to substitute Futura with on Windows, it does not choose Futura Std. Now we can use the Find Font feature, and change all the instances of "Futura" to "Futura Std", but if we pass the file back to the designer, they have to then do the reverse. What is the right way for managing this?

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  • Adding value of cell X only if cell Y is blank

    - by Graeme Hutchison
    I have a list with three columns A, B, and C. The first two columns are complete (A and B), while the third (C) has many blanked fields. What I want to do is replace all the blank fields in Column C with the same value form cell A in the same row. The List contains over 2000 records, of which 65% have a blank Column C value, so I would like to use a formula/function. Below is an example of what I have and what I want to do (on a much smaller scale)

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  • Mac: window manager frozen, have ssh access

    - by Bernd
    I have a Mac which regularly runs into a problem. The user interface stops reponding, showing a "frozen" user interface. The mouse is still moving but clicking does not trigger anything. This happens about once a week. Solution so far is to force switch-off the Mac and reboot it. I have ssh root access to the Mac. Killing (kill -9) the active application has no visible impact on what is shown on the screen. Any ideas on how to diagnose this? Is there a way to restart the window manager from the ssh shell? Killing /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework/Resources/WindowServer seems not to be possible. The Mac is an early 2008 iMac and runs Lion with latest updates. /Library/Logs/DiagnosticReports is empty. Update: Problem stays after update to Mountain Lion. The WindowServer process is in "uninterruptible wait" state ("U" flag in ps output set): imac:~ root# ps ax|awk "NR==1|| /WindowServer/"|grep -v awk PID TT STAT TIME COMMAND 86 ?? Us 50:51.69 /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework/Resources/WindowServer -daemon Any idea for diagnosing what blocks the process? Any idea for "waking up" the process?

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  • FPS lags with new acer aspire 5755G

    - by Calvin
    The title is kind of self explanatory, as my new laptop lags and has FPS drops. For example my FPS in Starcraft 2 hovers around 20 and constantly drops to 1 with low settings when I know it should run smoothly in high settings. I've updated my Nvidia driver, and set the preferred global settings to the 'High-performance Nvidia processor'. Here are some screen shots. Screen Shot One - Screen Shot Two - Screen Shot Three I'm not sure how to fix this problem, any feed back would be nice!

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  • Bypass a licence agreement when mounting a DMG on the command line

    - by Vitaly Kushner
    I'm automating my Mac installation using puppet. As a part of it I need to install several programs that come in a .dmg format. I use the following to mount them: sudo /usr/bin/hdiutil mount -plist -nobrowse -readonly -quiet -mountrandom /tmp Program.dmg The problem is that some .dmg files come with a license attached, and so script is stuck accepting the license. (There is no stdin/out when running with puppet, so I can't manually approve it to continue.) Is there a way to pre-approve or force-approve the license?

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  • How to install Ubuntu, Windows XP and Windows 7 from scratch as triple-boot system

    - by simon
    I'm currently running Windows XP, but have ordered Windows 7. I want to keep Windows XP on a separate partition, and install Ubuntu as well. In which order should I install the OSs, and is there anything differing from an ordinary single-system install I should keep in mind? For example, does the order of partition make any difference? If I want to have the system drive as "C:" drive in both Win XP and Win 7, what should I do?

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  • The 20 Most Important Keyboard Shortcuts For Windows PCs

    - by Chris Hoffman
    Keyboard shortcuts are practically essential for using any type of PC. They’ll speed up almost everything you do. But long lists of keyboard shortcuts can quickly become overwhelming if you’re just getting started. This list will cover the most useful keyboard shortcuts that every Windows user should know. If you haven’t used keyboard shortcuts much, these will show you just how useful keyboard shortcuts can be. Windows Key + Search The Windows key is particularly important on Windows 8 — especially before Windows 8.1 — because it allows you to quickly return to the Start screen. On Windows 7, it opens the Start menu. Either way, you can start typing immediately after you press the Windows key to search for programs, settings, and files. For example, if you want to launch Firefox, you can press the Windows key, start typing the word Firefox, and press Enter when the Firefox shortcut appears. It’s a quick way to launch programs, open files, and locate Control Panel options without even touching your mouse and without digging through a cluttered Start menu. You can also use the arrow keys to select the shortcut you want to launch before pressing Enter. Copy, Cut, Paste Copy, Cut, and Paste are extremely important keyboard shortcuts for text-editing. If you do any typing on your computer, you probably use them. These options can be accessed using the mouse, either by right-clicking on selected text or opening the application’s Edit menu, but this is the slowest way to do it. After selecting some text, press Ctrl+C to copy it or Ctrl+X to cut it. Position the cursor where you want the text and use Ctrl+V to paste it. These shortcuts can save you a huge amount of time over using the mouse. Search the Current Page or File To quickly perform a search in the current application — whether you’re in a web browser, PDF viewer, document editor, or almost any other type of application — press Ctrl+F. The application’s search (or “Find”) feature will pop up, and you can instantly start typing a phrase you want to search for. You can generally press Enter to  go to the next appearance of the word or phrase in the document, quickly searching through it for what you’re interested in. Switch Between Applications and Tabs Rather than clicking buttons on your taskbar, Alt+Tab is a very quick way to switch between running applications. Windows orders the list of open windows by the order you accessed them, so if you’re only using two different applications, you can just press Alt+Tab to quickly switch between them. If switching between more than two windows, you’ll have to hold the Alt key and press Tab repeatedly to toggle through the list of open windows. If you miss the window you want, you can always press Alt+Shift+Tab to move through the list in reverse. To move between tabs in an application — such as the browser tabs in your web browser — press Ctrl+Tab. Ctrl+Shift+Tab will move through tabs in reverse. Quickly Print If you’re the kind of person who still prints things, you can quickly open the print window by pressing Ctrl+P. This can be faster than hunting down the Print option in every program you want to print something from. Basic Browser Shortcuts Web browser shortcuts can save you tons of time, too. Ctrl+T is a very useful one, as it will open a new tab with the address bar focused, so you can quickly press Ctrl +T, type a search phrase or web address, and press Enter to go there. To go back or forward while browsing, hold the Ctrl key and press the left or right arrow keys. If you’d just like to focus your web browser’s address bar so you can type a new web address or search without opening a new tab, press Ctrl + L. You can then start typing something and press Enter. Close Tabs and Windows To quickly close the current application, press Alt+F4. This works on the desktop and even in new Windows 8-style applications. To quickly close the current browser tab or document, press Ctrl+W. This will often close the current window if there are no other tabs open. Lock Your Computer When you’re done using your computer and want to step away, you may want to lock it. People won’t be able to log in and access your desktop unless they know your password. You can do this from the Start menu or Start screen, but the fastest way to lock your screen is by quickly pressing Windows Key + L before you get up. Access the Task Manager Ctrl+Alt+Delete will take you to a screen that allows you to quickly launch the Task Manager or perform other operations, such as signing out. This is particularly useful because if can be used to recover from situations where your computer doesn’t appear responsive or isn’t accepting input. For example, if a full-screen game becomes unresponsive, Ctrl+Alt+Delete will often allow you to escape from it and end it via the Task Manager. Windows 8 Shortcuts On Windows 8 PCs, there are other very important keyboard shortcuts. Windows Key + C will open your Charms bar, while Windows Key + Tab will open the new App Switcher. These keyboard shortcuts will allow you to avoid the hot corners, which can be tedious to use with a mouse. On the desktop side, Windows Key + D will take you back to the desktop from anywhere. Windows Key + X will open a special “power user menu” that gives you quick access to options that are hidden in the new Windows 8 interface, including Shut Down, Restart, and Control Panel. If you’re interested in learning more keyboard shortcuts, be sure to check our longer lists of 47 keyboard shortcuts that work in all web browsers and 42+ keyboard shortcuts to speed up text-editing. Image Credit: Jeroen Bennink on Flickr     

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  • Windows Azure : consultez les ressources proposées par Microsoft, participez au Quiz sur Developpez et gagnez des t-shirts et peut-être un Nokia Lumia

    Windows Azure : consultez les ressources proposées par Microsoft participez au Quiz et gagnez des t-shirts et peut-être un Nokia LumiaEn exclusivité pour les lecteurs de Developpez.com, l'équipe de la plateforme Cloud Azure de Microsoft a préparé des vidéos, tutoriels et bien d'autres que nous partageons chaque semaine.À la fin de chaque semaine, des questions vous seront posées. Tous ceux qui auront au minimum 80 % de bonnes réponses gagneront un t-shirt et seront de facto sélectionnés pour un...

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  • Des chercheurs dévoilent un prototype d'Internet du futur, reposant sur une architecture sans serveur, complètement décentralisée

    Des chercheurs développent un prototype de réseau d'architecture complètement décentralisée qui fera passer les attaques DoS pour des mauvais souvenirsUne équipe de chercheur de l'université de Cambridge a pour intention de remplacer le modèle relationnel client-serveur dont dépendent de nombreux services, applications et protocoles d'internet, par une architecture complètement décentralisée du réseau des réseaux. Le projet ambitieux se nomme Pursuit, et un prototype de l'internet de demain conçu...

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  • Une startup californienne annonce avoir battu le Captcha, grâce à un algorithme basé sur un réseau de neurones artificiel multicouche

    Vicarious, une startup Californienne vient d'annoncer avoir battu le fameux test de Captcha.Qui utilise internet et n'a jamais eu à affronter ce test ? Réponse : personne ! Captcha est ce fameux test que vous devez passer lorsque vous souhaitez créer un compte, faire une réservation, etc. sur un site internet.Ce test (parfois même compliqué pour un humain, car les chiffres sont illisibles) créé par Luis von Ahn, permet de différencier automatiquement un humain d'une machine. En effet, lors de l'essor...

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  • badBIOS : le rootkit qui infecte les BIOS et communique par les airs, Windows, OS X, Linux et BSD sont tous vulnérables

    badBIOS, le rootkit qui infecte les BIOS et communique par les airs Windows, OS X, Linux et BSD sont tous vulnérables.L'expert en sécurité canadien Dragos Ruiu est victime depuis quelques années des turpitudes d'un rootkit inconnu (qu'il a surnommé badBIOS) particulièrement coriace et évolué.Il y a trois ans, Ruiu fut notifié d'une mise à jour pour le firmware de son MacBook Air dont le système était fraichement installé. Depuis cette « mise à jour », la plupart des machines de son laboratoire...

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