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• Is zip's encryption really bad?

  - by Nifle

  The standard advice for many years regarding compression and encryption has been that the encryption strength of zip is bad. Is this really the case in this day and age? I read this article about WinZip (it has had the same bad reputation). According to that article the problem is removed provided you follow a few rules when choosing your password. At least 12 characters in length Be random not contain any dictionary, common words or names At least one Upper Case Character Have at least one Lower Case Character Have at least one Numeric Character Have at least one Special Character e.g. $,£,*,%,&,! This would result in roughly 475,920,314,814,253,000,000,000 possible combinations to brute force Please provide recent (say past five years) links to back up your information.

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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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• Apt getting wrong nginx source

  - by Shauna

  I'm working on updating Nginx on my server from 0.7.65 (Ubuntu 10.04 repo) to 1.0.2 (from the PPA). I installed it just fine, but I would like to add/activate some modules. I found this tutorial for doing it with dpkg, which works well for ensuring that it maintains the defaults that apt-get uses for things like install location, and would like to use it to do the same for 1.0.2. However, when I run apt-get source nginx, it downloads the 0.7 source from the main repo, and when I run apt-get source nginx-full or apt-get source nginx-common, it selects nginx instead. Is there any way I can force it to get the source from the PPA, so that I can use dpkg and not have to deal with hacking in the Debian folder that dpkg requires?

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• Caching Reverse-Proxy ISP Host for a Low-Bandwidth Server

  - by Casey

  I am building a webcam w/ HTTP server that will be running from a low-bandwith connection. The content on the site will be changing every 5 to 10 minutes. Instead of serving files directly from this connection, are there hosting companies that can act as a reverse proxy for my site? Therefore, if nobody is using the site, the local internet connection remains idle. And if I receive 1000 hits all at the same time, only one HTTP GET is required, and the hosting company (on a fat pipe) continues serving the other 999 requests? This doesn't sound like a very common usage model, but I feel like this would be the optimal solution to my situation.

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• What technical reasons exist for not using space characters in file names?

  - by Chris W. Rea

  Somebody I know expressed irritation today regarding those of us who tend not to use spaces in our filenames, e.g. NamingThingsLikeThis.txt -- despite most modern operating systems supporting spaces in filenames. Are there technical reasons that it's still common to see file names without (appropriate) spaces? If so, what are these technical reasons that spaces in filenames are avoided or discouraged, and in what circumstances are they relevant? The most obvious reason I could think of, and why I typically avoid it, are the extra quotes required on the command line when dealing with such files. Are there any other significant technical reasons?

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• How do you set up redundant servers?

  - by user59240

  To the sysadmins out there, I'm trying to get an idea about how you go about maintaining redundant servers for small projects. The modest number of servers in my mind is two, and three main essential services come to mind: HTTP, mail and DNS. How do you automate this duplicity? Is rsync the tool of choice (again, for small projects)? In addition to common tools for these tasks, references to books and articles would be greatly appreciated. The more hands-on the approach, the better. Thanks!

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• Keyboard shortcuts in non-English version of Microsoft Office

  - by Squall

  I have a big problem with the Portuguese version of MS Office 2007 and 2010. The standard shortcuts that any common application uses are changed. Some shortcuts that are not working: Ctrl+S (save), Ctrl+F (find) and Ctrl+A (select all). I want to configure it to use the shortcuts of the English version. There is an option that allow to configure each shortcut separately. Furthermore, I have to configure for each app, if I configure in Word, I will have to configure again for Excel. How to use the shortcuts of the English version of MS Office regardless of the Office language? Thanks

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• Favicon on gmail has changed from the envelope to a black gun. How do i change it back and why did i

  - by Victoria

  I think my gmail account might have been hacked because I've recently noticed a change in the favicon displayed in the url and the tab, when I logged onto my gmail account. It used to be the common red and white envelope and now it's a black gun. Can anyone tell if this is enough to conclude that my account has been hacked or tampered with? I know someone that would be capable and most probably willing to cause problems to my account among other things. This would be my opsessive ex who's best friend is a hacker. Can anyone help? I need to know if someone has reigns to my computer. And how do I change the favicon back to its orginial image? The black gun really bothers me. Thanks everyone!!!

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• How to secure both root domain and wildcard subdomains with one SSL cert?

  - by Question Overflow

  I am trying to generate a self-signed SSL certificate to secure both example.com and *.example.com. Looking at the answers to this and this questions, there seems to be an equal number of people agreeing and disagreeing whether this could be done. However, the website from a certification authority seems to suggest that it could be done. Currently, these are the changes added to my openssl configuration file: [req] req_extensions = v3_req [req_distinguished_name] commonName = example.com [v3_req] subjectAltName = @alt_names [alt_names] DNS.1 = example.com DNS.2 = *.example.com I tried the above configuration and generated a certificate. When navigating to https://example.com, it produces the usual warning that the cert is "self-signed". After acceptance, I navigate to https://abc.example.com and an additional warning is produced, saying that the certificate is only valid for example.com. The certificate details only listed example.com in the certificate hierarchy with no signs of any wildcard subdomain being present. I am not sure whether this is due to a misconfiguration or that the common name should have a wildcard or that this could not be done.

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• Handling UTF-8 with BOM in HTTP

  - by Alois Mahdal

  Say I have a script which at some point serves a plain text file as a content (right after "\n\n"). These files are provided by users, but I can expect they will be UTF-8. So I hard-wire Content-Type: text/plain; charset=UTF-8. But while I can teach users to save everything in UTF-8, I can't be very sure that the files will be without BOM ("\xEE\xBB\xBF"), as at least on Windows, this is not very clearly distinguished in common plain text editors and not every one of them uses the same default. So what about these files created on Windows, where they may/may not start with BOM? Should/will server or UA get rid of this debris for me? Or is it my task to prepare clean UTF-8, i.e. open each file and check whether BOM needs to be removed?

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• Increasing Screen Resolution to more than limit and scaling to origional

  - by Akshat Mittal

  I have a laptop, with Screen Resolution - 1366x768 (most common) - I want to increase it further to 1600x900 (or higher), in the same ratio. I want to scale the higher resolution on my current screen to fit it. I found xrandr with command xrandr --output LVDS1 --scale 1.4x1.4, this worked but again resulted to another problem, it does the scaling thing but the cursor is still blocked into the native screen resolution and I am not able to move it further, I found that the bug is already filed here. Also this command was only for Linux, I wanted to do this thing with both Linux and Windows (including Windows 8). I want a similar software that is bug free (at least not a major bug like this) and that supports Windows as well (or two separate software for Windows and Linux). Any help is appreciated and Thanks in advance.

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• Transparently cache files from a network drive in Linux

  - by Vadim

  We have a Linux server that reads files from a network drive and processes them. In a common scenario, a user will log in and access the same files over and over again. The size of the files varies but the larger ones can be around 50+ Mb. The files seldom change. I was wondering if it's somehow possible to transparently cache the files. I don't want (or can) change the program the reads the files, nor do I control the protocol by which the files are accessed. I just want something to detect that I access a certain path, copy the file locally (if needed) and then read the file from the local drive. I've read about Bcache but can't figure out if it's what I need. Do you have any suggestions? Thanks, Vadim.

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• Likeliness of obtaining same IP address after restarting a router

  - by ?affael

  My actual objective is to simulate logged IPs of web-site users who are all assumed to use dynamically assigned IPs. There will be two kinds of users: good users who only change IP when the ISP assignes a new one bad users who will restart their router to obtain a new IP So what I would like to understand is what assignment mechanics are usually at work here deciding from what pool of IPs one is chosen and whether the probability is uniformly distributed. I know there is no definite and global answer as this process can be adjusted be the ISP but maybe there is something like a technological frame and common process that allows some plausible assumptions. UPDATE: A bad user will restart the router as often as possible if necessary. So here the central question is how many IP changes on average are necessary to end up with a previously used IP.

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• Beam display from any computer to shared display

  - by rcourtna

  There are probably a lot of ways to skin this cat. Looking for the cleanest. In our office, we have a large display in a common area. We want to allow any computer in our office (mac, linux, windows) to output its video on the large display. Since some of the computers in the office are stationary, and it's not practical to run video cables everywhere, it would be preferable to make this all happen through the network. It is also possible for us to connect a dedicated (& networked) PC to the large display. How can I do this?

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• Website: Requested filename being rewritten

  - by horatio

  I have been unable to find an answer via search. I have a website (I do not administer the servers) where the server will serve a different file than the one requested. I first noticed this when using a filename of the following form: _foo.php (single underscore) If I request foo.php (does not exist), the server returns _foo.php. By "returns" I mean that the server decides I meant _foo.php, processes the php file, and serves the output. If I request afoo.php, zfoo.php, or even __foo.php (two underscores) (these files do not exist) the server returns _foo.php. If I request aafoo.php, the server returns 404. To sum up: the server seems to be doing a partial filename match. My question is: what is happening and is this accepted behavior for a web server (or standard behavior of a common mod/package/etc)?

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• I just got a linode VPS a week ago and I've been flagged for SSH scanning...

  - by meder

  I got a 32-bit Debian VPS from http://linode.com and I really haven't done any sort of advanced configuration for securing it ( port 22; password enabled ). It seems somehow there is ssh scanning going on from my IP, I'm being flagged as this is against the TOS. I've been SSHing only from my home Comcast ISP which I run Linux on. Is this a common thing when getting a new vps? Are there any standard security configuration tips? I'm quite confused as to how my machine has been accused of this ssh scanning.

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• Network connection through a wall

  - by BCS

  I have a place where I want to set up a network connection through a normal residential wall where I can't cut any holes. I don't want to just set up a wireless system. Does anyone make a device that you place on either side of a wall to hook up a connection? Preferably something that can do 100Mb full duplex and can't be eavesdropped on with common hardware? The situation is that I'm moving into a new place (that I'm renting, so I can't do any cutting) and the POP is in one room and I have all the equipment is in another room.

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• install red5 demos via installer or within war file manually

  - by dursunturan

  I'm using Ubuntu 10.10 and installed the red5-server package. I've also downloaded oflaDemo.war file from that address. First I tried to install the oflaDemo via installer, but I couldnt reach the goal. I see the .war file under the /tmp directory, I got stuck with this message: "This may take a couple minutes, please wait". After that, I put the downloaded war file into the /webapps directory and wait 10 minutes as mentioned in red5-common.xml. Unfortunately, nothing changed ... So I decided to extract war file manually. I did this: jar -xvf oflaDemo.war Ok, I see all of the unzipped content under the webapps directory, but how can I preview the demo via a web browser? I really need to make live stream via Red5. Please help me.

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• Need to upgrade DDR2 RAM on HP Desktop

  - by jds

  I have this HP Pavilion Desktop. As you can see, that page says the memory speed supported is PC2-4200. It currently has a 512 MB stick - CPU-Z Screenshots: hxxp://i41.tinypic.com/j5clj6.jpg and hxxp://i39.tinypic.com/20tldlc.jpg However, a crucial.com scan gives a slightly different report - hxxp://crucial.com/systemscanner/viewscanbyid.aspx?id=5718CFE831D926C3 It says the system can support PC2-5300 memory. So my question is which one should I trust? I want to upgrade the computer's ram to 2 GB (the maximum supported), because XP Media Center is giving me problems and I will install Windows 7 on this. PC2-6400 is the most common DDR2 memory I have been able to find here in the market. Will it cause any problems if I install 2 × 1 GB PC2-6400 DDR2 memory sticks (in dual channel) in this computer, (afaik, it will just run at the lower speed of 533 MHz, or whatever the motherboard supports), or do I absolutely need to get PC2-4200 sticks?

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• Tool to bulk speed up/convert an audio file

  - by User1

  I want to listen to certain podcasts on my phone but I have two common problems: The audio is in some weird format (some don't play on my phone). The audio is slow. I want to use something like sox or avconv to bulk convert the files. Since this is just voice and going on a cell phone, small low-quality files would be best for me. I had some good success using avconv: avconv -i weird.wma normal.ogg Unforunately, this command creates an enormous ogg file and I can't get it play faster. Ideally, this particular file would play at 170% of the original speed.

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• Clicking hyperlinks in Email messages becomes painfully slow

  - by Joel Spolsky

  Running Windows 7 (RC, 64 bit). Suddenly, today, after months without a problem, clicking on links has become extremely slow. I've noticed this in two places. (1) clicking hyperlinks in Outlook email messages, which launches Firefox, takes around a minute. Launching Firefox by itself is instantaneous - I have an SSD drive and a very fast CPU. (2) opening Word documents attached to Outlook email messages also takes a surprisingly long time. The only thing these two might have in common is that they use the DDE mechanism, if I'm not mistaken, to send a DDE open command to the application. Under Windows XP this problem could sometimes be fixed by unchecking the "Use DDE" checkbox in the file type mapping, however, I can't find any equivalent under Windows 7. See here for someone else having what I believe is the same problem. See here for more evidence that it's DDE being super-super-slow.

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• Events 1030 and 1006 in Windows 2003

  - by jab

  I've got a computer running Windows 2003 R2 Standard Edition Service Pack 2 and periodically (every 5 minutes) the systems generates 2 errors that can be seen in the event viewer. The codes of the events are 1030, 1006 that seems to be related to group policies... I don´t know if these events are realted to the perfomance of the system but anyway i would like to fix them. I've googled around and seems to be a common problem but i haven't found a solution for these events. Do you know how can be fix it? Thanks in advance

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• VMware ESXi 4 On-Disk Data Deduplication - possible and supported?

  - by hurikhan77

  Environment: We are running multiple web, database, and application servers which usually share a pretty common installation (gentoo linux) and similar configuration in VMware ESXi 4. The differences are usually only some installed features or differing component versions. To create a new server, I usually choose the most similar (by features) running server, rsync a copy of it into freshly mounted filesystems, run grub, reconfigure and reboot. Problem: Over time this duplicates many on-disk data blocks which probably sums up to several 10's of gigabytes. I suppose if I could use a base system as template with the actual machines based on top of that, only writing changed blocks to some sort of "diff image", performance should improve (increased cache hit rate) and storage efficiency should increase (deduplicated storage space). This would be similar to what ESXi already supports for RAM deduplication (page sharing). Question: Is there any way to easily do this on ESXi 4? I already share the portage tree via NFS but this would not work for the rootfs.

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• Picking up a lot of failed authentications for various accounts

  - by Josh K

  My server is getting a lot of various failed authentication attempts for various accounts. The most common one (that I've seen ) or the root account. I have since enabled Fail2Ban and ran several rootkit / malware checks to ensure I wasn't compromised. Is there anything else I should do? I only have three accounts enabled, and SSH access for only two. I have a full 48hr ban on anyone making more then six failed SSH login attempts. I do not have FTP enabled.

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• Large temp files created in Windows Server 2003 temp folder

  - by BlueGene

  I'm managing a Windows Server 2003 with around 30 GB space in primary partition. A couple of times the server has crashed with error message saying that the C: drive is full. After searching folders to free up space, I found that lot of temp files being created in C:\WINNT\Temp and some of them of enormous size with more than 2GB. The temp files have common name, Efs###.tmp. Since we encrypt files frequently using Windows's EFS, I initially suspected Windows encryption. But after reading the documentation, I found that Efs###.tmp are in fact created by EFS but they are created only under the folder which you're currently encrypting, not in Temp folder. This looks very strange since Efs##.tmp files shouldn't be created under C:\WINNT\Temp unless someone tried to encrypt that Temp folder itself. The server has Tivoli Backup client. Could that be messing with windows Encryption? Can anyone shed some light on what could be causing the issue?

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