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• Squid Proxy Antivirus - Recommendations / Performance

  - by Jon Rhoades

  Due to our user's increasing expertise at downloading virus and the like, we are investigating adding Antivirus to our Squid proxy. A casual Google reveals several free and one paid: HAVP squid-vscan Viralator Safe Squid (commercial) None of the 'free' ones have reached v1 yet, nor do any inspire huge confidence form their websites (although of course I would rather they spent their time on the app rather than their website!). Does anybody have experience with any of these (or any other similar apps). If so are they suitable for a production network with 400ish concurrent users, and what sort of CPU/RAM requirements does it have?

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• In Ubuntu, how do I change my default Greek font?

  - by Matthew

  I'm taking a course in ancient Greek, and I store notes and flash cards on my computer. However, by default Ubuntu uses a modern Greek font. This changes some noticable things--for example, a circumflex is ? instead of a?. I can type the circumflex by switching back to english and entering the unicode combining character u0311 (which is what I just did to type the second a), but obviously this is very cumbersome. I've installed the "ttf-linex" package from the Ubuntu repositories, which claims to include an ancient Greek font. But I have no idea how to enable this font for whenever I switch to the Greek keyboard layout.

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• Save static version of a webpage to be available offline

  - by Tal Weiss

  Is there a way to save a webpage as static HTML, available for offline viewing, editing etc.? I want to remove all javascript files. Leave only HTML, CSS and images. For example, if this web page has a Facebook Like button, I want the image of the button to be part of the HTML as a regular image (and not be loaded as some Javascript code runs after I load the page). I'm trying to prepare a webpage for an offline demo. When I use the standard "save as HTML complete" like tools, all the Javascript is saved as well, and when viewed offline, all the dynamic content is blanks. Note- I don't expect the dynamic content to work, of course, with no Javascript. I just want the web page to LOOK as though it was just loaded from the interwebs. Thanks, Tal.

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• What are some topics you'd like to see covered in an 'Introduction to Network Security' book?

  - by seth.vargo

  I'm trying to put together a list of topics in Network Security and prioritize them accordingly. A little background on the book - we are trying to gear the text towards college students, as an introduction to security, and toward IT professionals who have recently been tasked with securing a network. The idea is to create a book that covers the most vital and important parts of securing a network with no assumptions. So, if you were a novice student interested in network security OR an IT professional who needed a crash course on network security, what topics do you feel would be of the upmost importance in such a text?

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• Getting ROBOCOPY to return a "proper" exit code?

  - by Lasse V. Karlsen

  Is it possible to ask ROBOCOPY to exit with an exit code that indicates success or failure? I am using ROBOCOPY as part of my TeamCity build configurations, and having to add a step to just silence the exit code from ROBOCOPY seems silly to me. Basically, I have added this: EXIT /B 0 to the script that is being run. However, this of course masks any real problems that ROBOCOPY would return. Basically, I would like to have exit codes of 0 for SUCCESS and non-zero for FAILURE instead of the bit-mask that ROBOCOPY returns now. Or, if I can't have that, is there a simple sequence of batch commands that would translate the bit-mask of ROBOCOPY to a similar value?

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• Grant root access without having grant access with mysql

  - by PJ

  In attempts to learn more about apache and mysql, I've been fiddling with my local environment. Fun times. Of course, this leads to my screwing things up. So, thanks for being there. Recently, I messed up a bit in mysql. I currently don't have a root user, and the users I do have don't have grant access. So, I can create users and all that, but I can't create a root user with super powers. Besides removing and reinstalling mysql, is there a way to grant a user total access in my current situation?

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• When did Red Hat start shipping PHP 5.3 with 5.x?!?

  - by Jason

  Okay this is a PSA more than a question because I know the answer: January 13, 2011. See: https://rhn.redhat.com/errata/RHEA-2011-0069.html Colour me surprised though, didn't hear anything about in the blogosphere until I got a Security Errata notice today. I have been using the REMI repo for this in the past but will switch over to the Red Hat blessed PHP 5.3. Don't down-vote me bro! I'll select as the best answer the source that broke the news first (other than Red Hat of course). People have wanted this for so long I'm just amazed that it's finally happened!

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• How good is PDF password protection?

  - by Tim

  It appears that Word's password protection is not really good, at least until Office 2003, if I read this SU entry correctly. I'm under the impression that Acrobat's PDF password protection should be better (it says 128-bit AES for Acrobat 7 and higher). Is that true? Of course, it depends on the strength of the password used, but assuming I protect my PDF with a password like sd8Jf+*e8fh§$fd8sHä, am I on the safe side? Like, say, for sending confidential patient information - not really valuable, but potentially highly sensitive.

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• Preprocessing incoming mail with fetchmail/procmail/mutt

  - by KAction

  I use fetchmail-procmail-mutt programms to all my mail. Some of mail generated automatically and some people not smart enough, so I would like to reformat mail body with some script. My best guess is that I should do it with procmail. But I found no such rule, best thing I found is possibility to pipe mail to programm. Of course, I can resend it with flag that no futher formatting needed, but it does not look like right solution. EDIT: Just discovered maildrop. Maybe, it is simpler to do my task with it?

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• Show Windows 8 Start Menu on the primary monitor

  - by Brandon Kreisel

  I'm having the issue where the Windows 8 Start Menu shows up on the secondary monitor instead of the primary. When booting the machine the start menu appears originally on the primary screen as it should. Sometime during the course of the day the menu starts appearing on the secondary monitor instead of the primary. What should happen/initial settings: Primary Monitor - Win8 Metro Interface Second Monitor -Blank Starts happening after a few hours Primary Monitor - Blank Second Monitor -Win8 Metro Interface My Settings: Display 1: Resolution: 1920x1080 Multiple Displays: Extend these displays This is currently your main display Display 2: Resolution: 1440x900 Multiple Displays: Extend these displays []Make this my main display

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• IIS6 host multiple websites under same sub-domain (or something similar)

  - by user28502

  I'm trying to figure out a structure for a hosted application that i'm working on. I've got a domain lets call it app.company.com (a sub-domain company.com of course) that is setup to redirect to my IIS 6 web server. I would like to set up one website in IIS for each client that will use this application. And have the URL schema be like this: app.company.com/clientA -- would point to ClientA website in IIS app.company.com/clientB -- would point to ClientB website in IIS Do you guys have any pointers or best practices for my scenario?

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• Migrating Windows 2008 R2 to Windows 2012 (migrate all FSMO too)

  - by Mauro

  I own 2 server with Windows 2008 R2, both DC. The first one is of course the Primary DC (with all FSMO). What I would like to do is ro dcdemote the 2nd DC, remove it from domain and replace the Windows 2008 r2 with 2012. I will then rejoin this 2nd DC (with the new 2012 server) to domain and dcpromo it (Server Management). After this is a new DC I would like to temporary transfer all the FSMO to this server, while I'm doing the same operation on what is actually the Primary DC. Is this a stupid solution? What I would like to do is a clean installation, I don't want to upgrade directly those systems. Suggestions? Ideas? Thanks, Mauro

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• What is the simplest possible configuration of Apache2 mod_proxy?

  - by Eye of Hell

  Hello. I have an apache2 running and i have a service available as http://www.domain.com:8080/sitename What will be a simplest apache2 configuration so entering "http://www.domain.com" in browser will show "http://www.domain.com:8080/sitename"? I have added: <VirtualHost *:80> ProxyPass / http://www.domain.com:8080/sitename/ ProxyPassReverse / http://www.domain.com:8080/sitename/ </VirtualHost> But, of course, this is not workig. Is it some simple configuration i can use for such redirect or i'm doomed to copy-paste a 100+ line configs from tutorials?

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• How can I exceed the 60% Memory Limit of IIS7

  - by evilknot

  Pardon if this is more stackoverflow vs. serverfault. It seems to be on the border. We have an application that caches a large amount of product data for an e-commerce application using ASP.NET caching. This is a dictionary object with 65K elements, and our calculations put the object's size at ~10GB. Problem: The amount of memory the object consumes seems to be far in excess of our 10GB calculation. BIGGEST CONCERN: We can't seem to use over 60% of the 32GB in the server. What we've tried so far: In machine.config/system.web (sf doesn't allow the tags, pardon the formatting): processModel autoConfig="true" memoryLimit="80" In web.config/system.web/caching/cache (sf doesn't allow the tags, pardon the formatting): privateBytesLimit = "20000000000" (and 0, the default of course) percentagePhysicalMemoryUsedLimit = "90" Environment: Windows 2008R2 x64 32GB RAM IIS7 Nothing seems to allow us to exceed the 60% value. See attached screenshot of taskman.

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• BlueCoat reverse proxy NTLM authentication

  - by mathieu

  Currently when we want to access an internal site from Internet (IIS with NTLM auth), we have two login screens that appear : step1 : LDAPAuth, from the BlueCoat that check login/password validity against Active Directory step2 : NTLM auth, from our application. Is it possible to configure the reverse proxy to use the LDAP credentials provided at step1, and give them to whatever application that requests them ? Of course, if those credentials aren't valid, nothing happens. We're using BlueCoat SG400. Update : we're not looking for SSO where the user doesn't have to enter a password. We want the user to enter his domain credentials in the LDAPAuth dialog box, and the proxy to reuse it to authenticate against our application. Or any application that uses NTLM. We've only got 1 AD domain behind the reverse proxy.

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• Redirecting wildcard emails to one email with postfix

  - by Burning the Codeigniter

  I'm creating a bounce email system where emails can reply to messages on my site. However when the emails are sent to the user containing the previous message, the Reply-To field contains an email something like this [email protected] (which contains the ID at the end). If the user replies, the reply message will be sent back to [email protected] which of course, doesn't have its own mailbox, except the [email protected]. How would I redirect all incoming messages coming from a specific wildcard notification-message-*@mysite.com to [email protected]? I did some research, but no solid part worked, including the luser_relay = [email protected] and putting notification-message-* in the postfix aliases table, the notification@ has a Maildir, so the emails would go into it. I am using Ubuntu 11.04.

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• How to restore a previous firefox session?

  - by jae

  FF 3.5.4 on Ubuntu 9.10. I have (of course) session saving (the built-in one) enabled. I closed the main FF window, but the "Downloads" window was still open. And on reopen, it had forgotten about the previous tabs. This is annoying is hell, and yes, I should report (or check for) a bug. If I could stomach bugzilla, that is. :P I have the sessionstore.js file with this older session (scanning it with less showed many of the sites I know had been open). How do I get FF to use this session file? I did try to remove sessionstore.* and copy the sessionstore.js (or .bak) to the profile folder. But that doesn't have any effect. EDIT: rewritten, to make it as obvious as it can be. I wasn't expecting people to jump to the "this guy's a stupid git" quite so easily.

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• Why would a server not send a SYN/ACK packet in response to a SYN packet

  - by codemonkey

  Lately, we've become aware of a TCP connection issue that is mostly limited to mac and Linux users who browse our websites. From the user perspective, it presents itself as a really long connection time to our websites (11 seconds). We've managed to track down the technical signature of this problem, but can't figure out why it is happening or how to fix it. Basically, what is happening is that the client's machine is sending the SYN packet to establish the TCP connection and the web server receives it, but does not respond with the SYN/ACK packet. After the client has sent many SYN packets, the server finally responds with a SYN/ACK packet and everything is fine for the remainder of the connection. And, of course, the kicker to the problem: it is intermittent and does not happen all the time (though it does happen between 10-30% of the time) We are using Fedora 12 Linux as the OS and Nginx as the web server.

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• Make ZoneAlarm stop pausing my C programs when I run them

  - by rMaero

  I'm using Dev-C++ to develop some console apps to study. When my program tries to run system("PAUSE"); ZA stops it and asks me to allow or deny it. I check the "always" box but it seems that every time I compile it, it generates a new exe file so every time I run it ZA pops up. Of course the simplest solution is to disable it or deal with it :-P but I'm not eager for any of both. Any suggestions? thanks in advance!

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• Is there a free-embedded SSH solution ?

  - by ereOn

  Hi, I'm working for an important company which has some severe network policies. I'd like to connect from my work, to my home linux server (mainly because it allows me to monitor my home-automated installation, but that's off-topic) but of course, any ssh connection (tcp port 22) to an external site is blocked. While I understand why this is done (to avoid ssh tunnels I guess), I really need to have some access to my box. (Well, "need" might be exagerated, but that would be nice ;) Do you know any web-based solution that I could install on my home linux server that would give me some pseudo-terminal (served using https) embedded in a web page ? I'm not necessarily looking for something graphical: a simple web-embedded ssh console would do the trick. Or do you guys see any other solution that wouldn't compromise network security ? Thank you very much for your solutions/advices.

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• Windows Remote-App Server 2012 Office 2013 User Settings not saved

  - by dave

  I have a Windows Server 2012 with RemoteApps enabled. It's running the latest Patches etc. It has Office 2013 installed and Excel and Word are shared to all users. Now I got the Problem that after each Reboot all User Settings are lost. I have a few users who pin previously opened Documents so they dont need to remember all Paths and those are all gone after Reboot. Also last opened Documents is empty and after a Server reboot it brings the office 2013 Window for First time setup where it asks if you want to connect to skydrive and all that. In the RemoteApps Collection I enabled a Userprofile-Drive 100GB drive E: for Storing User profile data. There is a Domain of course and there is no GPO Preventing the user from Storing settings etc. We also got an older Terminal Server 2003 in the same Domain where this is not happening. Any ideas why this is happening that all the Settings are lost after Reboot?

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• raspberry pi for web programming/development

  - by Mark Dee

  I'm into web development and my machine (AMD Phenom II, 8G RAM) is running Ubuntu 13.04. I love my current setup but I kinda miss some of Windows software like MSOffice or Adobe suites, and running on Virtualbox doesn't feel as snappy for me.... So I'm thinking of buying a new cheap machine where I would install Linux and do my development work there and have my current machine run Windows. I just found this thing called Raspberry pi which is really cheap and requires 12v only (I think) which makes it good for downloading stuff overnight. So, does it make sense to buy Raspberry pi, make it my primary dev machine, Windows being the secondary (for Adobe and browser testing of course)? Basically, I want to know if Raspberry pi meets the following requirements: It should run ArchLinux Sublime Text 3 python ruby nginx nodejs Deluge or Transmission (well, maybe just those, no need for videos and music players)

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• Change Gnome panel profile according to number of displays

  - by ifischer

  I'm running Ubuntu 10.04 on a Laptop. I have a startup script which enables external displays, if they are connected. It runs at GDM startup, configured in /etc/gdm/Init/Default. When i'm running without external displays, Gnome should use 2 Panels. When i'm using 2 external displays, Gnome should add an additional Panel to the second display. But this should of course be removed again if i detach the external displays (and restart). Can i configure this use case by using Gnome Panel-profiles? I read that there is a startup option "--profile" for gnome-panel, but i don't know how and where i could switch the profile, especially because this has to be done after recognizing the number of displays. Or can i add a general Gnome profile and switch between those profiles somehow to achieve this behavior?

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• Two Google accounts in firefox for email/reader/openid

  - by deddebme

  I usually checking my personal gmail account account at work, and I have another gmail account for work/professional purpose. Now I am starting to see more sites using OpenID. The problem I am facing is that I want to check my gmail from firefox, but I want to use my work google account to login with OpenID website. Is there an easy to do so? Of course one way is to logout my personal account, login my work account, OpenID login to those sites. Second way is to use another browser for my personal gmail and firefox for work, but are there a better way because I hate using two browsers at the same time?

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• rm on a directory with millions of files

  - by BMDan

  Background: physical server, about two years old, 7200-RPM SATA drives connected to a 3Ware RAID card, ext3 FS mounted noatime and data=ordered, not under crazy load, kernel 2.6.18-92.1.22.el5, uptime 545 days. Directory doesn't contain any subdirectories, just millions of small (~100 byte) files, with some larger (a few KB) ones. We have a server that has gone a bit cuckoo over the course of the last few months, but we only noticed it the other day when it started being unable to write to a directory due to it containing too many files. Specifically, it started throwing this error in /var/log/messages: ext3_dx_add_entry: Directory index full! The disk in question has plenty of inodes remaining: Filesystem Inodes IUsed IFree IUse% Mounted on /dev/sda3 60719104 3465660 57253444 6% / So I'm guessing that means we hit the limit of how many entries can be in the directory file itself. No idea how many files that would be, but it can't be more, as you can see, than three million or so. Not that that's good, mind you! But that's part one of my question: exactly what is that upper limit? Is it tunable? Before I get yelled at--I want to tune it down; this enormous directory caused all sorts of issues. Anyway, we tracked down the issue in the code that was generating all of those files, and we've corrected it. Now I'm stuck with deleting the directory. A few options here: rm -rf (dir)I tried this first. I gave up and killed it after it had run for a day and a half without any discernible impact. unlink(2) on the directory: Definitely worth consideration, but the question is whether it'd be faster to delete the files inside the directory via fsck than to delete via unlink(2). That is, one way or another, I've got to mark those inodes as unused. This assumes, of course, that I can tell fsck not to drop entries to the files in /lost+found; otherwise, I've just moved my problem. In addition to all the other concerns, after reading about this a bit more, it turns out I'd probably have to call some internal FS functions, as none of the unlink(2) variants I can find would allow me to just blithely delete a directory with entries in it. Pooh. while [ true ]; do ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; done ) This is actually the shortened version; the real one I'm running, which just adds some progress-reporting and a clean stop when we run out of files to delete, is: export i=0; time ( while [ true ]; do ls -Uf | head -n 3 | grep -qF '.png' || break; ls -Uf | head -n 10000 | xargs rm -f 2/dev/null; export i=$(($i+10000)); echo "$i..."; done ) This seems to be working rather well. As I write this, it's deleted 260,000 files in the past thirty minutes or so. Now, for the questions: As mentioned above, is the per-directory entry limit tunable? Why did it take "real 7m9.561s / user 0m0.001s / sys 0m0.001s" to delete a single file which was the first one in the list returned by "ls -U", and it took perhaps ten minutes to delete the first 10,000 entries with the command in #3, but now it's hauling along quite happily? For that matter, it deleted 260,000 in about thirty minutes, but it's now taken another fifteen minutes to delete 60,000 more. Why the huge swings in speed? Is there a better way to do this sort of thing? Not store millions of files in a directory; I know that's silly, and it wouldn't have happened on my watch. Googling the problem and looking through SF and SO offers a lot of variations on "find" that obviously have the wrong idea; it's not going to be faster than my approach for several self-evident reasons. But does the delete-via-fsck idea have any legs? Or something else entirely? I'm eager to hear out-of-the-box (or inside-the-not-well-known-box) thinking. Thanks for reading the small novel; feel free to ask questions and I'll be sure to respond. I'll also update the question with the final number of files and how long the delete script ran once I have that. Final script output!: 2970000... 2980000... 2990000... 3000000... 3010000... real 253m59.331s user 0m6.061s sys 5m4.019s So, three million files deleted in a bit over four hours.

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