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  • Centralize proxy settings for all the application on my workstation

    - by Leonardo
    As a consultant, I used to work at different clients premises. It happens frequently that most of them has specific proxy settings, but not all the application I have installed on my laptop get settings from system preferences, for allowing me to change settings in one place. Some of them bypass system preferences completely, proposing their own mask for entering specific data such as username, host and password. I am looking for a convenient and not much intrusive way to share a common access point on which I could enter data, and maybe persist them. An 'automatic' switching would be ideal, for example based on some network identification, but there's no problem for me to enter data manually. I am not an IT expert, but to explain myself clearly, I am looking for a solution like .pac file is for browsers. Relevant OS I am using are MacOSX and Linux (Ubuntu).

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  • How does IPv4 Subnetting Work?

    - by Kyle Brandt
    This is a Canonical Question about IPv4 Subnets How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. What is classless routing and why is class-based routing obsolete? If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? What is NAT (Network Address Translation).

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  • Exchange 2007 backup / restore

    - by Matt
    To explain my situation I have a exchange 2007 server and I have recently upgraded to SP2 so that I can use windows server backup to take an "exchange aware" backup of the server. Is there an easy way of restoring this data onto a second server to which I have pre-installed server 2008 / exchange 2007 without upsetting my current exchange server set-up. Also is there a better way to do this, such as running one as a fall over should the primary exchange server develop a fault. I am still new to all this so please excuse any stupidity in my questions. Thanks in advance for any help and assistance

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  • How can I figure out exactly which process is keeping my Mac from going to sleep and waking it up?

    - by pattern86
    I have read this knowledgebase article, but would like to know if there's a way to tell exactly which process is causing my Mac not to follow the sleep schedule I have set in System Preferences Energy Saver. I have narrowed it down to a being a process and will explain why I think so (see below). I am running OS X (10.6.5) on the new iMac 27" and I am certain it's not the following: The "Wake for Network Access" checkbox in Energy Saver settings (has never been a previous issue) Peripherals (has never been a previous issue) Any active GUI application (all are closed) Additional USB/FireWire drives (none are connected) Bluetooth (it's off) Sharing services (has never been a previous issue) The symptoms are as follows: The computer doesn't go to sleep at the predetermined time. It will wake up some number of hours after being put manually to sleep (but not within the first few seconds/minutes.) Is there a specific string I should be looking for in Console? I have tried searching for "wake" and "sleep" but can't make total sense of the results.

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  • Security when, ssh Private keys are lost

    - by Shree Mandadi
    Cant explain my problem enough with words, Let me take an example.. and please multiple the complexity by a 100 for the Solution. User-A has two ssh private keys, and over time has used this public key on a number of servers He lost one of them, and has created a new pair. How does User-A, inform me (Sys Admin), that he has lost his key, and How do I manage all the servers to which he had access to (I do not have a list, of all Servers that User-A has access to). In other words, How do I recall, the public key associated with this Private key. REF: In the LDAP based Authentication, All Servers would communicate with a single Server repository for Authentication, and If I remove acess or modify the password on the Server, all Systems that use this LDAP for Authentication are secured, when User-A loses his password..

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  • How to manage a home-grown YUM package repo?

    - by TomOnTime
    There are plenty of websites that explain how to manage a mirror of YUM repos. I want to run a repo for my home-grown packages. Is there a good way to manage such repos? What I need to do: Manage 3 repos: unstable, testing, stable Self-service functions that let users add/remove/promote packages (promote means moving a package unstable?testing or testing-stable). ACLs that control which users/groups may add/remove/promote packages. Automatically re-sign packages as they move repo to repo (since the GPG key for "stable" should be different than "unstable") Automatically run "createrepo" to update repodata when needed. Suggestions?

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  • Cannot increase my screen resolution

    - by Patrick Beardmore
    I am trying to install my new monitor but my Graphics Adapter (Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family) does not offer a resolution of 1920x1080 in the [Display Properties Settings] window. It only offers up to 1360x768. Can anyone explain to me how I can increase this number to the correct resolution. The monitor does show my the windows desktop, albeit at a lower resolution which is being stretched to fill the screen, making it look very blurry. I have installed the "Monitor Drivers" I found on the disk supplied with new monitor, but these do not appear to have made any difference. The Intel software that comes with the graphics card has an information window containing lots of info about the card and the monitor itself. I have placed this on a webpage so you can examine it if helpful. Many thanks with your help in getting my Christmas present to work! Patrick P.S.: Before I got this screen I checked to see if my graphics card could cope with such a large screen.

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  • Booting Windows7 kernel from an initrd/wim image file

    - by Ivo
    I'm wondering if it's possibile to have Win7 kernel and relative drivers (especially storage drivers) to boot from an initrd-like image file (maybe .wim?) and later then mount the windows root partition and complete the load of the full OS? I'll try to explain why: I'm running an emulated environment with NO REAL BIOS, and I'm passingthrough a raid storage controller. I want windows to boot from this controller array, but of course the BCD manager cannot access disks in the array until kernel and relative controller storage drivers are loaded. To be clear I get the classical winload.exe missing error. I need a similar solution to what Linux does, loading the kernel and his drivers, and later then mount the root partition and complete the boot. Any ideas or advices?

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  • Significant OS X Finder lag when listing directories/files

    - by Jack Sleight
    I'm experiencing some significant OS X finder lag, that seems to be purely an issue with Finder itself, and not the HD or any other part of OS X (I'll explain below). The lag only appears to be when listing directories/files, where I'm seeing up to twelve or so seconds of lag (the folder opens with a blank list and the spinner going in the bottom right). This happens with both the local SSD and network drives (connected via ethernet or wifi) Browsing both local and network drives in terminal and listing directories is instant I can actually browse files on my NAS from my phone over a 3G connection from the other side of the country faster than Finder can when connected to the local network (madness!) Can anyone help? Thanks.

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  • Daily Weekly and Monthly DB backup with logrotate?

    - by benjisail
    I am currently keeping daily backup of my database by doing a daily mysqldump and by using logrotate to keep the 7 last days of mysqldump. I would like to improve this backup process to keep 7 daily backup, 3 weekly backups and 12 monthly backup. I found this article which explain how to di this with logrotate : http://www.hotcoding.com/os/sysadmin/35751.html However I am using the dateext logrotate option to name my backup files so I cannot use this solution. How can I do daily, weekly and monthly backup with logrotate and with the dateext option?

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  • Apache2 server does not start cannot pen shared object file

    - by sid__
    I am working with Apache and Passenger for a Rails project. And a during a restart I got the following error Cannot load /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11/ext/apache2/mod_passenger.so into server: /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11/ext/apache2/mod_passenger.so: cannot open shared object file: No such file or directory However there is no change in the apache configuration file. I have attached the snippet from the conf file 287 LoadModule passenger_module /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11/ext/apache2/mod_passenger.so 288 PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11 289 PassengerRuby /usr/bin/ruby1.8 I am also unable to locate the shared object file in the location pointed to by the server though I am not really sure how the .so file is works (created/destroyed) I would also appreciate it if someone could explain to me what exactly has happened. I understand the shared object file is mission, what could be the reason it got deleted.

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  • Why does a Windows 7 installation grow so seriously and how to shring it?

    - by Ivan
    I store all my data and the most of applications (those legally available in "portable" versions) on drive D: and only use drive C: for the Windows system and some heavily integrated applications like MS Office, Visual Studio, Adobe Reader, Flash Player etc. When I was using Windows XP, 50 GiB drive C: was more than enough. Now, as I've mitigated to Windows 7, it hardly is. Yesterday as I've checked, 7 GiBs were free on drive C:. Then I've installed fresh Windows updates (which were just some tens of MiBs to download) and checked again: now there are only 2 GiBs free. Where have 5 GiBs gone? PS: Don't be surprised my system installation takes actually that much: I've got Visual Studio and SQL Server with complete offline documentation library, but that doesn't explain where does free space disappear on simple Windows updates. PPS: I use an augmented CCleaner version to clean my PC every day, so there are for sure no temporary internet files of recycle bin trash files taking the place.

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  • Why my dns server ip got blacklisted instead of my email server ip?

    - by Khurram Masood
    We are hosting our own dns server our scenario is as under; dns ip: a.b.c.1 fqdn:ns1.example.com ------ reverse lookup to a.b.c.1 mail server ip a.b.c.2 mail.example.com ------ reverse lookup to a.b.c.2 smtp.example.com ------ no reverse lookup pop.example.com ------ no reverse lookup web server ip a.b.c.3 example.com ------ reverse lookup to a.b.c.3 www.example.com ------ no reverse lookup a few days back our dns server ip got blacklisted and all our services were down from outside. We had also added a new dns server on a separate network that caused our domain and machines with same names as above to resolve on different ips, can this b a cause of being blacklisted? But all blacklists points towards spamming. Can anyone please explain why my dns ip got blacklisted instead of my email or web server ip?

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  • Exporting a VM running as a Domain Controller

    - by AndyM
    There is a Microsoft KB article that talks about best practices for running a DC on a VM. One of the notes is "Do not use the Export feature on a virtual machine that is running a domain controller". In order to export a VM, the VM needs to be turned off. If you turn off a DC VM, export it, import it on another server and then power the VM back on, there should be no risk as long as the original (exported) VM is never powered back on. Can someone explain to me why this isn't supported? After doing some searching on Google, the sites I found just regurgitated this line from the KB article, but didn't offer any explanation as to why this isn't supported.

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  • Mysql Master-ColdMaster

    - by enedebe
    I explain my case: I'm at Amazon AWS and I want to be fault tolerant on a entire region failure. My basic problem is to have the db in sync with 2 regions. My options: Master-Master (high lag) Hand made sync every 5 minutes Master-ColdMaster?! (copy on the fly but Master won't wait the other region commit) In my system we could afford loosing a piece of data (we're not a bank) the last inserts in the db, but we could not afford more than 10 minutes of downtime. The database is small and the level of inserts is low, and I wouldn't affect the normal usage waiting other region commit. Is the 3 solution posible? And the most important, once the primary fail how we can detect and change the rol between master-coldmaster -- coldmaster-master ? Is there any clean-mode to restore between failure? Thank's!

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  • On Mac OS X how can I monitor what is using my internet connection?

    - by Jon Hopkins
    I've got a relatively limited broadband connection (I live miles from the nearest exchange) and from time to time net access (but nothing else) slows to a near crawl. I know from a bit of monitoring software that the connection is being fairly heavily used which would explain it but I don't know what's using it. There are certainly plenty of things which might (these days there are dozens of apps that will either regularly or infrequently check data or download updates) but how can I find out? I'm happy to pay (a small amount of) money if needed, though in that case I'd rather it were a recommendation that me just Googling for something.

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  • Is there a way to automatically disconnect a notebook from the eletrical power-supply?

    - by Diogo
    I know this looks like weird and useless, but let me explain... I'm running Windows Assessment and Deployment Kit (Windows ADK) to make some tests on Windows 8 Preview. One of it's assessment is the "Battery Run Down Test", which tests battery consumption with some procesor load. I'm trying to "automate" in some way this test, I mean, I wish to execute it without any human intervention (such as manually disconecting the eletric power source to leave my notebook running only from batteries to run this assessment). So, there is some ACPI API, Windows API or even an easy bat shell/VBScript/Powershell command to do this? Does someone already made something like? PS: I'm asking this because I couldn't found any answer, but maybe someone here would have any tip...

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  • How to solve my black screen at boot?

    - by Juanillo
    I've got a friend with a weird problem. When he starts his computer the screen is completely black until the computer is completely started. So the screen is black until it suddenly shows the Windows desktop. He said that this is happening since a technical service repaired his computer, but that repair is not now in warranty. Recently the computer stopped working, but as the screen is black he cannot access to BIOS or start in safe mode (by pressing F8). When he inserts the Windows Vista DVD the system doesn't boot from DVD (it mustn't be configured in this way in the BIOS). Maybe there´s a problem with the hardware (maybe the graphic card)? Can anyone explain a reason why the screen is black during start-up? Any idea of what to do with the computer to restore it?

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  • Session Variables lost between pages reloads

    - by Android Addict
    I was forced to move to IIS 7 when the server running our IIS 6 died. Nothing in the web app has changed, but it's obvious the environment has dramatically. The app fails between pages because the session variables are lost during redirect. I am not an expert on app pools but my impression from reading several posts is that the app pool is being recycled immediately. While they give a reason, they offer no help in how to resolve this. Can someone explain to a newb how to properly configure the DefaultAppPool?

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  • How can Facebook's session get mixed up because of NAT and/or Proxy

    - by Alex
    Have received some reports from a customer (a very large company) they reported issues from clients who are using Facebook. These clients claim that once in a while when they log in to Facebook they end up in someone else's session. I know that network is NATed then Proxied before getting to Facebook.com. Although I'm not able to explain how this issue can occur. Is it possible that the Proxy is not sending the right session back to the clients? How can they end up with someone else's session since Facebook is cookie based session?? Anyone seen this before?

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  • Access permission /opt/ in Ubuntu

    - by user1201239
    I want to access my /opt/ folder I have found following commands for giving access permission. But not sure what is the purpose of this commands which one is the better to use it to maintain security and access permission both. Please explain me the purpose or what this different numbers means in security permission ? here are they , sudo chmod 755 -R /opt/ sudo chmod 755 /opt/ sudo chmod 775 /opt/ sudo chmod 777 /opt/ I dint know these commands so what I use to do previously was "gksudo nautilius" then rightclick- change the owner from root to current usergroup But now as I have found this commands I would like to know Which one should i use ? and what they do ?

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  • Files turned into folders on external hard drive

    - by Kashif
    I have a networked hard drive where I like to store audio/video/software and all sorts of other files for my house. While the software files are all intact and working, many of my video and audio files have been turned into folders! Can anyone explain why this is happening, how I can prevent it, and if it is possible to revert these "folders" back into files. Thanks much! An example of what the folders are named: "Highschool Graduation.avi", "Birthday party.avi", "Somesong.mp3" The HDD is connected to a Linksys E4200 router (Firmware Version: 2.0.37). This is how the HDD is networked.

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  • Memory management (segmentation and paging) in 80286 and 80386: How does it work?

    - by Andrew J. Brehm
    I found lots of Web sites and books explaining how memory management worked on the 8086 and later x86 CPUs in Real Mode. I understand, I think, how two 16 bit values, segment address and offset are combined to get a linear 20 bit physical address (shift segment four bits to the left, add offset; segments are 64K and start every 16 bytes). But I couldn't find any good Web sites or books that explained how memory management works in Protected Mode, specifically the differences between 80286 and 80386. Can anyone point me to a good Web site or book (or explain it right here)? (For extra credit, i.e. an upvote, how does it work in Long Mode?)

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  • Can't access dfs namespace over vpn

    - by cpf
    Hi Serverfault, I've recently configured 2 servers in AD on the same domain level. They are physically separated and permanently connected through a site-to-site vpn for dfs replication. All well, but when users connect to either site through vpn (from home e.g.) they can't use the domain level method: \\domain.com\data Internally this works perfectly, resolving domain.com when connected through vpn gets the correct IP. I've tried Google to figure things out. What I was able to find was that more people have this issue, no real solution found though. Can anyone explain why this is happening? Especially a solution would be really helpful! Thanks in advance.

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  • Alt-tab icon list in Gnome and metacity?

    - by Vinh Nguyen
    Can anyone provide a reference or explain how the icons to the alt-tab list is populated? I would like to specify some icons for some programs that do not have icons, e.g. xterm. I'm using Ubuntu 11.04 with Gnome 2 (Ubuntu Classic) and metacity as the window manager. I did see this thread that mentions /usr/share/pixmap/, but if I use cp gnome-terminal.xpm xterm.xpm the icon was not populated in the alt-tab icon list (even after a logout/login). I do see that the icon is populated when I added the xterm command to the Program Menu.

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