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• RAID10 Without BBU, With UPS

  - by Richard

  My datacenter says that each rack has primary and backup power on each rack. I assume this means there is a UPS for each server. Therefore, do I have any need of getting a BBU for the following setup? Intel Cherry 520 SSD x 4 RAID 10 LSI-9260 with WRITEBACK CACHE ENABLED I have heard that without a BBU the data in the cache could be lost. Since my needs aren't mission-critical, I can afford to lose some data. But would the rest of the data on the HD be corrupted?

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• Is there any way to do "mail server parking"?

  - by percyboy

  I am managing a mail server, which will be temporarily closed for three or four days due to the data center maintenance. I want to find a solution to (completely or partly) solve the lost mails during this unavailable period. Because the data volume is huge, it is very hard to migrate it to other data center. One approach I think out is to setup a temporary mail server in other data center, and when new mail received, the mail server automatically sends a return mail to tell the sender "We are temporarily closed for three or four days. Please send the mail later or contact in other means." I am wondering is this approach possible with existed mail server ? Or something better available ? (free solution is preferred for it is only for temporary)

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• Redirect physical keyboard input to SSH

  - by Dimme

  I'm having a raspberry pi running debian linux and I have an RFID reader connected to it. The RFID reader behaves like a keyboard. Every time I scan a tag it types then number of the tag and then carriage return. My problem is that I want to redirect the output of the RFID reader to my SSH session. That means anything that is typed to the physical keyboard of the pi should be displayed in my SSH window. I have tried with: cat /dev/tty0 but it wont work because the user is not logged in. Is there a way to disable the login screen after the pi boots and then redirect all input through SSH?

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• Does Windows 8 support the "start in [folder]" property for shortcuts?

  - by FumbleFingers

  I use Foobar2000 to play music, and for years now I've run it in what they call "portable mode". What that means is that the program itself isn't actually "installed" in the traditional Windows sense. All "non-system" dll's required by the application are in the same folder as the executable; earlier versions of Windows find them there, and everything runs fine. But Windows 8 fails because it doesn't find them. I want things set up this way because I keep Foobar2000 on a portable external hard drive, so I can just move it between different computers without having to go through the Windows install process. With all previous versions of Windows, I could either directly run the application from File Explorer, or create a shortcut on the desktop with the "start in folder" property set to the actual folder containing the program. I can still use the first method, but I want a shortcut! Is there any way to do what I want?

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• How to make sure clients update their browser cache when my website is updated?

  - by user64204

  I am using the HTTP 1.1 Cache-Control header to implement client-side caching. Since I update my website only once a month I would like the CSS and JS files to be cached for 30 days with Cache-Control: max-age=2592000. The problem is that the 30-day period defined by Cache-Control doesn't coincide with the website update cycle, it starts from the moment the users visit the site and ends 30 days later, which means an update could occur in the meantime and users would be running with outdated content for a while, which could break the rendering of the website if for instance the HTML and CSS no longer match. How can I perform client-side caching of content for periods of several days but somehow get users to refresh their CSS/JS files after the website has been updated? One solution I could think of is that if website updates can be schedule, the max-age returned by the server could be decreased every day accordingly so that no matter when people visit the website, the end of caching period would coincide with the update of the website, but changing the server configuration every day goes against one of my sysadmin principles (once it's running, don't touch it).

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• OS X Server: SMTP Server problem

  - by plucked

  Hi, I have problem to setup my mail server. My system is a OS X 10.6.2. Server. I configured the mail server so far, but I cannot connect to the smtp server correctly. Correctly means that I can connect via telnet (and do the "HELO") from another server within the same serverrack, but not from outside. But when I try to telnet my http server, it works fine from outside. I already checked my firewall rules with "sudo ipfw list" and the port 25 is not blocked in any case. What could be the problem with connecting to port 25 via telnet from outside of the serverrack? Cheers

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• transparently set up Windows 7 as remote workstation

  - by Áxel

  Maybe is a very basic question, but I can't find the exact terms to Google for it and find the concrete answer to my doubt. Suppose we have several PCs in which individual employees work. One of them has an extremely powerful CPU, and it's very useful to use that computer to perform heavy computations, but go there and set up your task means its user has to stop working for a while. Is it possible to allow a secondary user account to remotly log in, for example via Remote Desktop, and work with a full user environment, while the main user keeps working under his user session? I've used remote desktop many times in the past, but it always blocked current user session, or even terminated it. Lots of thanks in advance guys.

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• How can I prevent Apache from exposing a user's password?

  - by Marius Marais

  When using basic authentication (specifically via LDAP, but htpasswd also) with Apache, it makes the REMOTE_USER variable available to the PHP / Ruby / Python code underneath -- this is very useful for offloading authentication to the webserver. In our office environment we have lots of internal applications working like this over SSL, all quite secure. BUT: Apache exposes the PHP_AUTH_USER (=REMOTE_USER) and PHP_AUTH_PW variables to any application inside PHP. (PHP_AUTH_PW contains the plaintext password the user entered.) This means it's possible for the app to harvest usernames and passwords. Presumably the same information is available to Python and Ruby (all three are currently in use; PHP is being phased out). So how can I prevent Apache from doing this? One idea is to use Kerberos Negotiate authentication (which does not expose the password and has the benefit of being SSO), but that automatically falls back to Basic for some browsers (Chrome and in some cases Firefox), causing the password to be exposed again.

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• "bin/sh: can't access tty; job control turned off” error when running shellcode"

  - by Nosrettap

  I'm writing shellcode to exploit a buffer overflow vulnerability on a server. To do so I have port binding shellcode that I send to the server and then I run (from a linux terminal) the command telnet serverAdress 4444 where 4444 is the port which I have opened up. The hope is that I will receive a shell back that I can use to execute commands. However, I always end up with the command bin/sh: can't access tty; job control turned off I can't change any of the server code, and I believe the shellcode is correct because I got it from this website (http://www.tsirogiannis.com/exploits-vulnerabilities-videos-papers-shellcode/linuxx86-port-binding-shellcode-xor-encoded-152-bytes/). From my research, it appears that this may have to do with the mode that my terminal is running in (something called interactive mode...or something like that). All computers involved are linux machines and the machine that I am on is running the latest version of Ubuntu. Any ideas what this job control error means and how I can fix it?

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• Make a animation path separated by clicks

  - by Tomáš Zato

  I have a long text on powerpoint slide. Instead of separating it on multiple slides, I made an animation that moves it up using animation path, so that text hidden at bottom appears while text on top goes off screen. However, I need more move animations to reaveal more text (the text takes more than 2 screens). This means, I need two (or more) animation paths (of the same length) and I want them to move obejct from position, where the last path has left it. Instead, multiple animations always operate with objects original position. That's useless. You can download test document, where I made an example of what I want: animation test.pptx

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• error when using OWA access to mail server exchange 2010

  - by e0594cn

  Suddenly it will come out the below error when accessing the exchange 2010 mail server using OWA after clicking sign in button on initial page? ***The website cannot display the page HTTP 500 Most likely causes: •The website is under maintenance. •The website has a programming error. What you can try: Refresh the page. Go back to the previous page. More information This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying. For more information about HTTP errors, see Help.* Any suggestion? Thanks!

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• How can i lock images to a cell in excel 2010

  - by Jamie

  Ok, so i am using microsoft excel 2010 and have a set up currently where i have 2 views expanded and deflated using the Group or +/- function. My problem is that ui have images on the workbook too. The images are over the cells which are to be "hidden" when the - button is pressed and i would like the images to disappear with them. This is not curently happening instead they are moving to the next visible cell. I have included an example below incase i wasn't clear. I wish to hide Columns M:AU and the images are in various cells suchas N5 and O5. When i colapse (hide) the column range all of the images move to "AV5" the next row along that isn't hidden. This means the workbooks is looking messy when colapsed which is the oposite of what i was trying to do. Can anyone advise on a way around this?

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• AWS EC2: how to compute the cost

  - by EsseTi

  i'm new to AWS, i'm using the free right not and it's terrific. Now, in 1yr the free expires. i went to the website http://aws.amazon.com/ec2/pricing/ where the pricing is but i didn't really get how to compute it. The price are in $ per Hours but i don't think that this means, if i need to have my application running 24h/365d i've to multiplay it for 8760, or do i have? because they write about usage, but how do i compute this value? if i've a website where people in total spend smt like 10 minutes a month and 1 where people spend 750hour a months i pay the same? i can't believe that is the same price. PS:if i've a scheduled task, does it affect the usage?

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• Circumventing a manual HTML login page for "unclassified" websites (automation purposes, credentials

  - by auramo

  The IT department just made my life a little bit harder again: they introduced a manual HTML login page for all websites they have not "classified". This means that all the applications which try to access unclassified websites for e.g. downloading plugins do not work. Examples: Eclipse plugin installation, Maven builds etc. What would be the easiest workaround for this? The best I've come up with is try to extend/customize Ruby's httpproxy.rb that comes with Webrick. I would automate the manual login process whenever that login response page is detected. This sounds quite painful, and I think there might/should be simpler options?

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• What is shrink_slab, and why is it showing up in /var/log/messages?

  - by Steve Kehlet

  I'm investigating some application issues on a Linux system and noticed this around the time of the most recent problem, but not close enough to be definitively related: Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-155456000 Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-157859400 Jun 7 17:51:49 localhost kernel: shrink_slab: nr=-157833400 Jun 8 06:20:23 localhost kernel: shrink_slab: nr=-284172800 What is this? Googling isn't helping, I get that it's something with VM, but why is it suddenly showing up in /var/log/messages? Edit: I take it it's showing this because the number of pages it could free ("nr") is negative. Which is presumably a bad thing. I found patches for newer kernels that display a more useful message to this effect. Still not sure what this means though, or what I need to do about it.

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• How to activate Windows 8 Pro license with Releae Preview installed?

  - by Antonio

  So I'm one of the many who downloaded the Release Preview (64-bit). I now got the ISO to install Windows 8 Professional (64-bit) and a product key (note: I didn't get these from either Windows 8 Upgrade Assistant or Microsoft's web Store), everything legal. However, the Windows 8 Upgrade Assistant only gives me the option to Store my personal files which means that I'll have to say goodbye to both my Program Files and their respective configurations. I just want to input the Product Key and activate the license, why isn't this possible? Even "Add Features to Windows 8" doesn't accept the key. Do I really need to backup all of my stuff and make a clean install?

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• Do TCP/UDP connections add to the Windows incoming connection limit?

  - by user47899

  Hi all, I've tried to figure out what Microsoft means by "Windows sockets" and it all seems very vague. Basically we have customers that sometimes try to set up workgroups with close to 10 Windows XP computers with drive and printer shares and we're worried that some of the non-Windows Ethernet devices on the network will cause issues with the inbound connection limit outlined here where only 10 inbound connections can be active at one time. For example, there is an Ethernet Caller ID device that broadcasts UDP packets to all computers, and a kitchen display system that likewise broadcasts UDP. They may also have incoming TCP packets for our custom online ordering module. Do these TCP/UDP connections count toward the inbound connection limit? I'm aware that Windows 7 has increased the limit to 20 but we might have future customers that will push that limit. Thanks in advance

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• PC3200 RAM in Older Computer?

  - by skaz

  Hello all, I am inheriting a Dell Dimension 8200, but it needs RAM to get up and running. I have PC3200 sticks lying around, but I am not sure how to go about figuring out if the RAM is compatible, as RAM has always confused me. Here is the Dell Dimension 8200 Tech Specs: http://support.dell.com/support/edocs/systems/dim8200/specs.htm For RAM, it says: Memory type PC800 (non-ECC) I don't know if that is just the kind that comes with it, and I can put in PC3200 (I think, if it worked, this would run at the lower rating? Is that true?), or if that means only PC800 is compatible. Any help would be appreciated.

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• basic help for Nat configuration needed

  - by Klaes S.

  I have a server with a IP 1.0.0.5/24. This is the main IP address of the server, and now I have two other IP addresses for the server, they are 1.0.2.30/24 and 1.0.2.31/24. I want to make a VirtualBox running another OS accessible through the Internet, and only allow the specified IP to reach the virtual box. I'm new to iptables and therefore I need some basic help and getting started information about this. The hosting provider does not allow more than on MAC address per switch port, which means that I'm not able to make bridge as far as I know. Futhermore I want the host, to reject the extra IPs so its only the VirtualBox / virtual machine that accepts the request's on the extra IPS.

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• create a CNAME record for AWS LoadBalancer DNS name

  - by t q

  I am trying to setup a loadBalancer on AWS. The A-Record it gave me looks like myLoadBalancer-**********.us-east-1.elb.amazonaws.com however when i try to put that in my domain registrars A-Record, i get an errorIP address is not valid. Must be of type x.x.x.x where x is 0-255. amazons solution is you should create a CNAME record for the LoadBalancer DNS name, or use Amazon Route 53 to create a hosted zone. route 53 gives me DNS numbers but if i use that then my email doesnt work from the registrar. question: is there a way to use route 53 and retain my emails? or should i create a CNAME record for the LoadBalancer DNS name, if so how do i do this ... not sure what this means?

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• Bookmarks toolbar in Firefox 29?

  - by Magnetic_dud

  I love to have my favorite bookmarks (bookmarklets, and so on) on my firefox toolbar, but, surprise, in firefox 29 the toolbar is empty. I tried to use classic look restorer toolbar, but still the bookmarks toolbar is empty. When I add a new bookmark, I select "bookmark toolbar", but still is not shown on the toolbar. Should I wipe my firefox profile and try again (ugh, no, please), or it's because the firefox ui team decided that nobody likes toolbar? EDIT: I have the same problem at work, but here I don't have the permissions to uninstall and reinstall!! What can I do??? I can't just wipe my profile, because I must set up Firefox Sync in the classic way, that means I have to set up in Firefox<28 and then upgrade. When I drag bookmarks to the bookmarks tab, I get the forbidden icon (I took a photo because with a screenshot it doesn't show it)

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• Cannot delete folder - Content seems to be nested recursively

  - by RikuXan

  I cannot delete a folder located on my hard disk by any means. I don't quite know how it was created, all I know is, that it is a pretty deep structure of folders (too deep to delete it at once, since Windows restriction path name too long), but the problem in the end is, that I can't "pull out" the inner folders, because they don't seem to be folders anymore (Context menu lacks things like "Properties", "Cut", "Copy", "Delete" etc.) Here a picture of how a right click looks like on one of these "folders": As you can see, the current folder is in very deep, but that is not the problem, rather the one I left-clicked on. Has anyone any advice on how to get rid of these? I tried a chkdsk, said no errors. I also tried deleting those folder via a VMWare Ubuntu, to no success. I also tried a batch file from a volunteer at MS boards, that should automatically de-nest such folders, but I guess mine is a special case, since the tool only created more such folders.

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• Do old package versions in CentOS mean that they do not have security fixes?

  - by user1421332

  We asked our admin to update SVN on our CentOS 6.5 server. He did so and the result was SVN 1.6.11. However the current version of SVN is 1.8.9. I know the CentOS yum repository is not always up-to-date. But in that case I am confused: SVN 1.6.x is not officially supported anymore. This means it does not get any security fixes! How can the official CentOS repository provide such an old (and dangerous) version? Is there something we (or our admin) understood the wrong way?

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• Tool to allow Kerberos Authenticated users to modify Firewall settings

  - by Lars Hanke

  I run a firewall on a central router. Recently, several users want to use Skype. Since firewalling Skype virtually means to switch the firewall off, I consider to allow users to temporarily punch holes for their system. Since the users have no accounts on the router, I consider using Kerberos for authentication and authorization. The router is a Debian Squeeze box, with minimal configuration, i.e. no web-server, database or similar gimmicks. Does anyone know an existing solution, which could be used for that purpose? Or does anybody know easy to use and well documented frameworks in say Perl, Python, C, C++, ... making the set-up of a Kerberos authenticated Client and Server application really simple?

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• What''s the "earliest" place one can set an environment variable during Linux boot process?

  - by amn

  I know I can set a variable in a shell startup file, but the thing is, I am trying to set up a POSIX-compatible environment, and a POSIX shell does not parse any startup files other than the one specified by the environment variable ENV. This presents a problem - currently my login starts the shell as bash, which I will try to replace with sh so Bash runs as POSIX shell - however then it will not parse the default startup files and I need ENV set to specify these. Which means as far as I understand that I need to specify ENV before login starts the shell, correct? Now, how would I do that? I hope my question is clear, if not I will gladly redact it.

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