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• Just want to send emails from my Ubuntu Server. What simple SMTP server solution to use?

  - by Sergio Oliveira Jr.

  Basically I have a Ubuntu Server machine and I would like an idiot-proof solution for sending emails from my website that is also running in this same machine. My doubts are: 1) Should I use postfix or there are more simple solutions for an smtp server? 2) Do I need to be able to receive emails as well? I just want to send emails... 3) I did I simple test with postfix that came with my Ubuntu server and the email got sent, but it went to the spam box of my gmail. Anyway to avoid the spam box? 4) The email sender was [email protected]. How do I change that? Thanks very much! -Sergio

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• Got black screen when recording screen from xvfb by ffmpeg x11grab device

  - by shawnzhu

  I'm trying to record video from a firefox run by xvfb-run but it always output nothing in the video file except black screen. Here's what I did: start a firefox, open google.com: $ xvfb-run firefox https://google.com Then it will use the default display server number 99. I can see the display information by command xdpyinfo -display :99. A screenshot works very well by command: $ xwd -root -silent -display :99.0 | xwdtopnm |pnmtojpeg > screen.jpg Start using ffmpeg to record a video: $ ffmpeg -f x11grab -i :99.0 out.mpg When I play the video file out.mpg, there's black screen all the time. Is there any parameter I missed? Updates I made progress that the video works instead of black screen only by this command: $ ffmpeg -y -r 30 -g 300 -f x11grab -s 1024x768 -i :99 -vcodec qtrle out.mov Notice it requires the screen resolution matches by specify more options to xvfb-run: $ xvfb-run -s "-screen 0 1224x768x16" -a firefox http://google.com But I still want to get more feedbacks and answers here.

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• How to check a digital certificate?

  - by StackedCrooked

  I have extracted a certificate from a cable modem. Now I want to verify if this certificate is valid. If I understand correctly, the verification process consists of having the issuer sign the subject's public key and then comparing the result with the subject's signature. This signing process is done using the issuer's private key, which nobody but the issuer has access to. So even if I have both certificates on my PC, there is no way for me to verify the subject's validity. From this I can only conclude that the verification must be implemented as a remote service. The problem is that I don't know what remote service I need to access to verify this certificate. The issuer is "AVM GmbH Cable Modem Root Certificate Authority". How can I find the webservice for verification? Is there standard lookup mechanism for this?

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• Chrome: Saved username/password filled in incognito mode

  - by Wouter Coekaerts

  If I open an incognito window in Google Chrome and go to a webpage where Chrome has a saved username and password from (for example the login form on http://gmail.com), I see that my username and password are automatically filled in. Does that mean that I am not really incognito? Can the website see my username even if I don't explicitly log in? Or is there some mechanism behind the scenes that prevents the webpage from grabbing auto-filled values unless I actually log in? Clarification: Stored usernames (and passwords) are a lot like cookies: your unique identifier linked to a certain site, stored locally in your browser, available to the site when you open it. When you go incognito you ask your browser not to identify you to the sites you visit. It does that by (among other things) not exposing its cookies. Exposing the stored username in this mode does not make sense to me (but maybe I'm missing something...).

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• failed to enable x11 forwarding

  - by Hunt

  I am trying to enable X11 forwarding on my server which is running on FreeBSD 7.1. I have a putty installed in my windows in which i have enabled X11 forwarding by checking on Enable X11 forwarding and specifying following parameter X display location localhost:0 after that i run putty and checked whether X11 is enabled or not by typing following command echo "$DISPLAY" or echo $DISPLAY but i am getting following error DISPLAY: Undefined variable. Even i have installed XManager but in that also i am getting following error The X11 forwarding request was rejected ! To solve this problem, please turn on the X11 forwarding features of the remote SSH server can anyone suggest me how to get rid off this ?

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• Cannot turn on "Network Discovery and File Sharing" when Windows Firewall is enabled

  - by Cheeso

  I have a problem similar to this one. Windows Firewall prevents File and Printer sharing from working and Why does File and Printer Sharing keep turning off in Windows 7? I cannot turn on Network Discovery. This is Windows 7 Home Premium, x64. It's a Dell XPS 1340 and Windows came installed from the OEM. This used to work. Now it doesn't. I don't know what has changed. In windows Explorer, the UI looks like this: When I click the yellow panel that says "Click to change...", the panel disappears, then immediately reappears, with exactly the same text. If I go through the control panel "Network and Sharing Center" thing, the UI looks like this: If I tick the box to "turn on network discovery", the "Save Changes" button becomes enabled. If I then click that button, the dialog box just closes, with no message or confirmation. Re-opening the same dialog box shows that Network Discovery has not been turned on. If I turn off Windows Firewall, I can then turn on Network Discovery via either method. The machine is connected to a wireless home network, via a router. The network is marked as "Home Network" in the Network and Sharing Center, which I think corresponds to the "Private" profile in Windows Firewall Advanced Settings app. (Confirm?) The PC is not part of a domain, and has never been part of a domain. The machine is not bridging any networks. There is a regular 100baseT connector but I have the network adapter for that disabled in Windows. Something else that seems odd. Within Windows Firewall Advanced Settings, there are no predefined rules available. If I click the "New Rule...." Action on the action pane, the "Predefined" option is greyed out. like this: In order to attempt to allow the network discovery protocols through on the private network, I hand-coded a bunch of rules, intending to allow the necessary UPnP and WDP protocols supporting network discovery. I copied them from a working Windows 7 Ultimate PC, running on the same network. This did not work. Even with the hand-coded rules, I still cannot turn on Network Discovery. I looked on the interwebs, and the only solution that appears to work is a re-install of Windows. Seriously? If I try netsh advfirewall firewall set rule group="Network Discovery" new enable=Yes ...it says "No rules match the specified criteria" EDIT: by the way, these services are running. DNS Client Function Discovery Resource Publication SSDP Discovery UPnP Device Host in any case, since it works with no firewall, I would assume all necessary services are present and running. The issue is a firewall thing, but I don't know how to diagnose further, or fix it. Q1: Is there a way to definitively insure the correct holes are punched through the Windows Firewall to allow Network Discovery to function? Q2: Should I expect the "predefined" firewall rules to be greyed out? Q3: Why did this change?

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• Dell Studio 15 Broadcom wireless drivers not working in Linux Mint

  - by dcd0687

  I installed Linux Mint 12 on my Dell Studio 15 and everything worked perfectly up until I tried updating the STA Driver for the Broadcom (BCM4312) wireless controller. I've tried these bash commands in order and I still don't have wireless. sudo apt-get install b43-fwcutter sudo apt-get install b43-fwcutter firmware-b43-installer I've also tried uninstalling everything with synaptic package manager including broadcom-sta-common and broadcom-sta-source, then restarting and running the above commands which didn't work either. What's the best way to do this on a Dell Studio 15?

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• "Steam needs to be online to update" - 404 fetching *_osx.zip.*

  - by Chris Boyle

  Since yesterday evening, when I launch Steam on OSX, a self-update progress bar appears instead (at 0 of 30MB or so). This bar does not advance, an error dialog appears: Steam needs to be online to update Please confirm your network connection and try again. The app then exits. This happens whether wifi or ethernet or both are connected, and pings to the outside world succeed throughout. If I look at the logs in Console, they are very similar to this example (though that's not mine). Specifically: Success! http://store.steampowered.com/public/client/steam_client_osx?date=718277 [...] Failed! http://cdn.store.steampowered.com/public/client/breakpad_osx.zip.27f59114a86fcd50533e1d7b128f9300947f9969 Failed! http://cdn.store.steampowered.com/public/client/steam_osx.zip.11a99384214805f2dd3be5084ba6be61d662f8ac Failed! http://cdn.store.steampowered.com/public/client/miles_osx.zip.d9fb546541f59c1fdd03962a605236b1021abab8 Requesting the first URL successfully returns some data including the filenames of the latter three, and requesting any of those gives me a 404 (I've tried multiple clients on multiple continents). Searches on Google and Twitter show about 10-20 others having this problem in the past 24 hours, but hardly the angry mob I'd expect if the problem affected all Steam OSX users. Things that have already been tried with no effect: Switching between wifi and ethernet. Killing all Steam processes including ipcserver. Moving the ~/Library/Application Support/Steam/registry.vdf file away. Requesting those URLs with other clients and from other locations. Interesting: that first URL with the date parameter returns the same content even without that parameter (thus would lead to the same 404s) suggesting that the problem is not necessarily specific to coming from a particular currently-installed version of Steam.

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• Downloading image from Picasa Web Albums loses metadata

  - by Jarrod

  I have several photos on my Picasa Web Albums account. I have added captions, tags and location information to many of them through the PWA web interface. I assumed that PWA was saving this information in an IPTC, or some other metadata tag inside the image, but whenever I go to 'Download Photo' (on a single image), the resulting image, when saved to my computer, has no tags whatsoever. Does anybody know why this is the case? Does PWA require Picasa to be installed to preserve this information?

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• Disable Windows Key Hotkeys when using Virtualbox

  - by statenjason

  I'm currently running a VirtualBox of Arch Linux with Windows 7 x64 as the host. In Arch, I use dwm for window management. As dwm is heavily dependent on hotkeys, I've used the ALT key as its META key to prevent conflict with the Windows 7 host. However, when using emacs (also heavy hotkey usage) within dwm, there are issues because it's also using ALT for its own META. I'd like to change either dwm or emacs to use the windows key as META, but commands such as Win+L will be captured by the host machine and lock my system. Is there any way to prevent these hotkeys from being triggered while within VirtualBox?

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• What external comment system to use for Jekyll powered blog?

  - by Jakub Narebski

  What external comment system (i.e. something like Disqus or perhaps even Hacker News / YCombinator) would you recommend for Jekyll-powered blog (in this case: blog on GitHub Pages), or in more generic term for blog aware static site generator powered blog (which includes beside Jekyll also for example ikiwiki or xfire's growl)? Because a blog without comments is not a blog :-).

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• What is causing random hard freezes on my system? Kaspersky?

  - by Christian Ivicevic

  The last few weeks I experienced a new strange behavior of my computer. Sometimes Windows 7 just freezes with no real reason at all. While listening to music for example the playback hangs and you can hear a very nasty sound. Neither mouse nor keyboard input is handled and everything is just stuck. Using Ubuntu this does not happen, so I think it is just a matter of driver issues or a Windows 7 bug. Furthermore I am really suspicious about Kaspersky (Internet Security 11) and so I let it perform a complete virus scan while no other app is running. At about 50% it happened again and I needed to restart the computer by holding the power button the bad way... A really weird thing is that playing Skyrim this happened once, however music playback did not stop. Only the framerate dropped to 0 and sometimes for a few seconds I am able to move. Therefore I am really confused as furthermore no bluescreen pops up. Memtest told me that everything seems to be alright... Can anyone explain me which data you need about my hardware and software (and which tools tools to use to gather the informatik) to be able to provide any help on my problem?

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• Download the other half of the half downloaded video and download managers for Linux

  - by becomingGuru

  I tried downloading several videos last night on Chrome but most of them are downloaded incompletely. Is there a software that reads the flv or ogg files and downloads the rest of the file from the specified url? Downloading several GBs all over again gains me nothing, just adds to Global warming. Also, what is a good download manager for Ubuntu. How can I have it take over some bulk downloads from Chrome?

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• Dell Inspiron 1520 Intermittent connection to wireless router

  - by ChuckNevol

  I have two computers in my home which are connected to a wireless router and a wireless printer. One computer is a Del XPS and the other a Dell laptop Inspiron 1520. In recent weeks we noticed the Inspiron had difficulty maintaining connection to the wireless router - web pages would suddenly have to be reloaded, or the computer rebooted while the other computer, the XPS, had no problems on the same network. So we connected a hard wire line from the Inspiron to the Verizon supplied wireless router. Problems still exist. could it be a bad driver?

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• trying to format a sd card

  - by masfenix

  I recently found a SD card (1gb) lying around. Thought i might pop that into my card reader and see if anything is on it. nothing.. there isnt even a file system on it. so i try to right click and go "format" but nothing happens. so i try in command. i launch cmd and i go format f: it gave the following back:

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• AutoMapper Problem - List won't Map

  - by Randy Minder

  I have the following class: public class Account { public int AccountID { get; set; } public Enterprise Enterprise { get; set; } public List<User> UserList { get; set; } } And I have the following method fragment: Entities.Account accountDto = new Entities.Account(); DAL.Entities.Account account; Mapper.CreateMap<DAL.Entities.Account, Entities.Account>(); Mapper.CreateMap<DAL.Entities.User, Entities.User>(); account = DAL.Account.GetByPrimaryKey(this.Database, primaryKey, withChildren); Mapper.Map(account,accountDto); return accountDto; When the method is called, the Account class gets mapped correctly but the list of users in the Account class does not (it is NULL). There are four User entities in the List that should get mapped. Could someone tell me what might be wrong?

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• jQuery UI modal dialog box and the close button upper right: how to remove it.

  - by tahdhaze09

  I need to kill the close 'x' button at the top of the dialog box. I have a modal that opens with an OK button that redirects to the site. The site behind the modal is in an iframe. When the user agrees to the statement in the dialog box and clicks the 'OK' button, it redirects to the site that is outside the iframe. If the user clicks on the 'x', it goes to the iframe site, which I do not want to have happen. I need the modal to work as a one-way to the site it goes to. It basically forces the user to accept the user agreement. I would post code, but its an intranet site. Thanks everyone for your help!

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• Cant Login to xubuntu

  - by Prabhu

  I cant login to my xubuntu, after i enter my login details at the prompt it just shows the prompt again!

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• How should I fix problems with file permissions while restoring from Time Machine?

  - by Andrew Grimm

  While restoring files from a Time Machine backup, I got the error message "The operation can’t be completed because you don’t have permission to access some of the items." because of problems with files in one folder. What's the safest way to deal with this? The folder in question has permissions like: Andrew-Grimms-MacBook-Pro:kmer agrimm$ pwd /Volumes/Time Machine Backups/Backups.backupdb/Andrew Grimm’s MacBook Pro/2010-12-09-224309/Macintosh HD/Users/agrimm/ruby/kmer Andrew-Grimms-MacBook-Pro:kmer agrimm$ ls -ltra total 6156896 drwxrwxrwx@ 19 agrimm staff 680 18 Jan 2008 Saccharomyces_cerevisiae -r--------@ 1 agrimm staff 60221852 4 Aug 2009 hs_ref_GRCh37_chrY.fa -r--------@ 1 agrimm staff 157488804 4 Aug 2009 hs_ref_GRCh37_chrX.fa (snip a few files) -r--------@ 1 agrimm staff 676063 27 Oct 2009 NC_001143.fna -rw-r--r--@ 1 agrimm staff 6148 23 Mar 2010 .DS_Store drwxr-xr-x@ 3 agrimm staff 1530 23 Mar 2010 . drwxr-xr-x@ 30 agrimm staff 1054 20 Nov 14:43 .. Is it ok to do sudo chmod, or is there a safer approach? Background: Files within the original folder on my computer also had weird permissions - I suspect I may have used sudo to copy some files from a thumbdrive onto my computer.

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• OpenVPN DNS: VPN DNS stomping local VPN

  - by Eddie Parker

  I've finally noodled with OpenVPN enough to get it working. Even better, I can mount samba drives, ping network machines through the TUN device, etc - it's all great. However, I'm noticing that if I use the following directive, then some of the machines that are normally visible by the client, on the client's side (i.e., not through the VPN) get masked with some other server out on the Internet. push "dhcp-option DNS 10.0.1.1" # Push our local DNS to clients Is there any way to avoid this, besides hacking the 'hosts' file on the client machine? Ideally I'd like to only use my VPN's DNS for machines within that domain.

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• MacBook Pro + OSX Lion + Samsung SA550 HDMI not playing nicely

  - by rabbid

  I bought a Samsung SA550 monitor as a second monitor for my 2009 MacBook Pro that is running OSX 10.7 Lion. The monitor has 2 outputs, VGA and HDMI. If I connect using VGA everything is fine. If I connect using HDMI-DVI cable, and DVI-to-mini display converter I get static and flickering: The DVI-to-mini display converter that I use: I have used this converter with a different monitor that had a DVI output port a while ago, so at least it used to work once upon a time. I am not sure if this problem is because of that converter or not. I have never used a monitor with an HDMI output before. Appreciate your help. Thank you!

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• Mac OS X: How do I disable SSID Broadcasting with Internet Sharing over Airport?

  - by Jack Chu

  I'm currently using Internet Sharing from my Ethernet over Airport on my Macbook Pro, however I don't want my SSID broadcasted†. There doesn't seem to be an option in Sharing/System Preferences to hide my ssid or prevent broadcasting. Any ideas? † My parent's restaurant has a wifi router, but it's on the roof level where the cable was installed. The signal it gets is weak, but works for the macbook. Their iPhones and 802.11G based computers can't get the wifi connection, maybe 802.11N on the macbook gets better penetration. I figure they could use the airport sharing from the laptop. For a restaurant type setting I don't think having WPA or WPA2 is super important. There's nothing sensitive or insecure on the network, so I figure hiding the SSID would be good enough for their purposes. It's not even active 100% of the time.

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• go back to original version of firefox in ubuntu from beta version

  - by Jack Coroman

  In ubuntu 9.04, I tried to upgrade from firefox 3.0 to 3.5, by installing some apt-get packages, and there is a problem! Now firefox calls itself "Namoroka" and the firefox logo is gone and replaced by a black square in the upper bar and it says it is a development beta version. I really don't like this version, how can I go back to the stable version of firefox? I tried apt-get remove firefox-3.5 and apt-get install firefox-3.0 and that did not work. How do I go back to the stable version of firefox?

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• Unable to install VS2005 redist @W7 64bit

  - by BarsMonster

  Hi there, I am struggling with installing VS2005 64/x86 redistributable for W7 64bit: During install it displays an error: Error 1935: An error occured during the installation of assembly 'Microsoft.VC90.ATL, version 9.0.30729.1,publicKeyToken="1fc8b3b9a1e18e3b", processorArchitecture="amd64",type="win32"'. Please refer to Help and Support for more information. HRESULT: 0x800736FD Spent like 2 hours in google, no luck :-( Any ideas?

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• Fedora 10 setting up HPLIP for HP Deskjet F4488

  - by Shyam

  I had set up a newly purchased HP F4488 using HPLIP, I installed it on my Fedora 10 desktop and it worked fine for the past 2 days. Suddenly, it is failing to print. The scanner works and the photocopier works. When a print job is initialized there is an error and the printer gets disabled. What is the problem? Is there anything that I should fix additionally to make it work?

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