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• No Network Connection in WinXP image from Microsoft running on VirtualBox 3.1.6 OSE (Ubuntu 10.04) due to missing CD Rom

  - by Bevor

  I'd like to test local websites in IE7 and IE8.To do that I thought about using the free Microsoft images: http://www.microsoft.com/windowsxp/using/networking/setup/default.mspx I converted the VHDs to VDIs to make them run in VirtualBox. ( http://www.qc4blog.com/?p=721 ) This works fine. The problem is that in this Windows XP installation there is no Network Adapter configured. Actually nothing at all is configured because it needs the Windows XP CD Rom to do that. If I would have a Windows XP CD Rom, I would not need to run the Microsoft image, so is there some kind of workaround to get an internet connection? Meanwhile I set "bridged" in VirtualBox. But this doesn't help because "ipconfig /all" in the guest system doesn't show any data because nothing is configured. How can I get a connection to my local Apache (Host system). http://localhost would be enough. By the way: I can't install the "Guest additions". When I do that, the 3 days trial period of the guest system is suddenly gone, so I can't use it anymore and it is senseless. Any ideas? Update: I've tried the Vista image and it gets an internet connection. From Vista image I can get to my site with 192.168.1.3/mywebsite in the browser url. So actually I don't care about the WinXP issue anymore but I would be glad if anyone still knows a solution.

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• Follow through - How to setup equivalent USVIDEO.ORG DNS-Proxy on Linux

  - by DNSDC

  I'm quite keen to setup similar service (but FREE) and seems you know how to do this. "you need to run your own private dns with artificial records for example pandora.com you also need a real dns to fall back on. now that all requests for these sites are going to your US located box you can open up port 80 on squid and listen for the traffic. your cache_peer settings should allow you to map each domain to their real ip. The trafic now flows initially from your US located box to the service but then the server responds it responds directly to the host. no magic here. I won't share the fine details as it probably best serves all to not over exploit this." Did you mean we need to 1. Setup Forward-only DNS on a US-based server/ip? 2. Setup cache_peer and cache_peer_domain in Squid, I got this. 3. Any iptables rule, prerouting, postrouting rules needed to accomplish this? Appreciate your expert advice. Cheers, Don

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• Folder with files shows as empty

  - by ProfKaos

  Last night I create a new project in Visual Studio 2010, in the folder c:\development\hobby\devices. When I navigate to that folder in a new instance of Windows Explorer, I get the 'This folder is empty.' message in the files pane. If I then, from within Visual Studio, issue the "Open containing folder command", explorer opens to the folder c:\development\hobby\devices\LoopBack, where loopback is a project under the main folder. If I paste that path into another new instance of explorer, explorer correctly opens c:\development\hobby\devices. How is this possible? SOLVED: This is what comes of typing paths instead of selecting them. Some elementary detective work yielded the following interesting results: C:\>dir dev*. Volume in drive C is OS Volume Serial Number is E4B4-0563 Directory of C:\ 2010/11/28 09:20 PM <DIR> Development 2010/12/01 08:57 PM <DIR> Develpment 2010/11/02 06:31 PM <DIR> DevTools 0 File(s) 0 bytes 3 Dir(s) 63 965 368 320 bytes free Where my disappearing project was in the badly spelt one.

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• Issues with "There is already an object named 'xxx' in the database'

  - by Hoser

  I'm fairly new to SQL so this may be an easy mistake, but I haven't been able to find a solid solution anywhere else. Problem is whenever I try to use my temp table, it tells me it cannot be used because there is already an object with that name. I frequently try switching up the names, and sometimes it'll let me work with the table for a little while, but it never lasts for long. Am I dropping the table incorrectly? Also, I've had people suggest to just use a permanent table, but this database does not allow me to do that. create table #RandomTableName(NameOfObject varchar(50), NameOfCounter varchar(50), SampledValue decimal) select vPerformanceRule.ObjectName, vPerformanceRule.CounterName, Perf.vPerfRaw.SampleValue into #RandomTableName from vPerformanceRule, vPerformanceRuleInstance, Perf.vPerfRaw where (ObjectName like 'Processor' AND CounterName like '% Processor Time') OR(ObjectName like 'System' AND CounterName like 'Processor Queue Length') OR(ObjectName like 'Memory' AND CounterName like 'Pages/Sec') OR(ObjectName like 'Physical Disk' AND CounterName like 'Avg. Disk Queue Length') OR(ObjectName like 'Physical Disk' AND CounterName like 'Avg. Disk sec/Read') OR(ObjectName like 'Physical Disk' and CounterName like '% Disk Time') OR(ObjectName like 'Logical Disk' and CounterName like '% Free Space' AND SampleValue > 70 AND SampleValue < 100) order by ObjectName, SampleValue drop table #RandomTableName

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• How to make a redundant desktop system with daily snapshots? (Is btrfs ready for use?)

  - by TestUser16418

  I want to configure a desktop system in which the home filesystem would be redundant (e.g. RAID-1), and would have weekly snapshots taken. I've already done this with ZFS, the snapshot system is wonderful, and with send/recv you can easily create backups on external media. Unfortunately, at that point, I want GNU+Linux and not FreeBSD or Solaris, so I'm looking for suggestions for good alternatives. I reckon that my alternatives are: btrfs - it seems to be exactly what I need, it has snapshots and commands that allow you to easily replicate zfs send. Yet all documentation mentions that it's still experimental. I can't seem to find any actual reports on its reliability or usability issues. Can you point me to any information on that issue that could clarify whether it would be a possible choice? I have a large preference for this option, mostly because I don't want to reformat the drives when btrfs becomes ready, but I there's no information on whether it's usable at all, whether it's a silly idea to use it, etc. The question that I cannot get the answer to is what does "experimental" mean. lvm snapshots and ext4 - preferably not, since it can consume an awful amount of space when new files are created. Creating 200 GB files requres 200 GB free space and 200 GB additionally for snapshots. I also have found it unreliable -- failed metadata rewrite results in an unreadable PV. I'm wondering how btrfs would compare here. A single filesystem (ext4) on a RAID-1 array with custom COW snapshots with hardlinks (like cp -al). That's my current preference if I can't use btrfs. So how experimental btrfs is, which should I choose, and do I have any other options? What if I don't keep external incremental backups, would that affect my choice?

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• What method of MySQL mirroring should I use for this?

  - by user45745

  I'm running an web application hosting service (basically hosting forums for free), and I have two remote servers at my disposal. The code for the application is stored on both servers and isn't a problem, but I'm wondering how to deal with the databases. When someone goes onto a site *.example-host.com, they are sent to one of the two servers and both must be capable of loading the forums from a database. The database must also have write access, for when new members register or post topics etc. The main requirement is speed, but uptime is also important (if a server goes out, the site should still work). I have a few options, but I'm inexperienced and not sure which to go with: 1) [PHP] Split the forum records 50:50 between the two servers. If a server does not have the record for a forum requested, it can request it from the other by remote MySQL and load it. This idea sounded okay, until I realised that 50% of the time, users would be waiting significantly longer for pages to load. I also realised that if one of the servers went down, half the forums would be inaccessible and registrations would have to be disabled. 2) [MySQL] Dual master replication. This would attempt to mirror the two databases and sounds perfect, but I've heard that it can be very problematic. I don't know how fast this is. 3) [MySQL] Use a standard replication, distribute read only queries on both nodes and read/write queries to the master. This sounds like a good option, but again, I'm not sure on speed. I also don't know what would happen if the master server went down. If you have any other suggestions, please post them :)

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• How to boost playback volume in real time on media recorded with a very low volume.

  - by L Marksman

  I have never heard a satisfactory answer to this often misunderstood question, let me explain. Lets say I have a sound card and earphones/speakers that can play back audio loud enough in most cases. This is great but the problem is that you always find people who do not know how to record audio, from Youtube video's to music. So now you end up with a audio playback that only uses 10% or less of the capacity of your sound hardware, in vista/win 7 you will see this frequently in the mixer with the volume pushed up to max but the green sound level only goes up a millimeter or two. I am looking for (preferably free) software or a method to boost the sound level of any audio from any source in real time to use more of my hardware capacity similar to what VLC media player can do. Oh and please, do not tell me it is impossible. I am not trying to boost the volume past what my hardware is capable of, I am just trying to use my hardware's full capacity. Also please do not tell met to buy new hardware, I know I can use hardware amplification, I don't want to (like many others) spend money on a simple little problem like this. Thanks!

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• Is there such a thing as a file hosted container which deduplicates data held within?

  - by Mallow

  Background I have backups of a website which stores all of it's data into a single file. This file is several gigs large and I have many different backups of this file. Most of the data within is mostly the same plus whatever was added or changed to it. I want to keep all the concurrent backups I've made through the years in case I find a horrible surprise of data corruption along the line. However storing a 10gig file every month gets expensive. Seeking Solution I've often thought about different ways of alleviating this problem. One thought that comes up very often combines the idea of a duplicating file system which doesn't require it's own partitioned volume on a hard drive. Something like what truecrypt does, what it calls, "file hosted containers" which when using the truecrypt program allows you to mount and dismount that volume as a regular hard drive. Question Is there a virtual hard drive mounter which uses file-based container which uses data deduplicaiton file system? (This question is a little awkward to put into words, if you have a better idea on how to ask this question please feel free to help out.)

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• Information on the BMPP File Extension/Format

  - by Angel Brighteyes

  I am looking for information on the file type BMPp. Namely I need an application that can create this file type, preferably open source or free. Wikipedia says for BMP File Format that 'BMPp' is a "type code", which is the "mechanism used by pre-OSX Macs ... to denote a files format..." (Look in the little info-box of general information under "Type code"). Continuing my research, I found an old 2009 archived mailing list "Re: Incorrect png file type 'PNG' that talks about something related to another problem a developer is having. In the response he talks about there being variant file types, and lists BMPp as being linked to an old version of Graphics Converter. The company Lemkesoft sells Graphics Converter, which I am not willing to purchase. I can't imagine that the only program in existence to make a BMPp file is that program. There has got to be another way to make that file type, other than creating a BMP file and just renaming it to BMPp (unless of course it is really that easy)? This is the first time I've run into this file format, and it took a bit on Google, Bing, and Wikipedia to find the information that I've posted here. Any further help would be appreciated.

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• Windows XP VM on VMWare ESXi 4.1 "pausing" / blocked occasionally

  - by FelixD

  We have an issue with Windows XP SP3 VMs on VMWare ESXi 4.1.0 (the free version): They sometimes seem to "pause" for several minutes. This happens rarely (maybe once a month per VM, at least noticed only that often), but still is an issue for us. It happens for three different but similar VMs on three pretty different hosts (different hardware). I have the feeling that the "pausing" is not actually the CPU blocking, but probably the harddisks, but not 100% sure. The servers have one IDE disk (C:) and one SCSI (D:) and it might be either of the two. I have seen scheduled tasks simply not starting for up to 9 minutes and then running normally again with normal speed. They were totally blocked. This is not a load issue, the VMWare hosts have average load and the VMs in question already have reserved CPU resources plus high priorities for CPU and disk. The Windows boxes run mainly MySQL, Tomcat, FileZilla server, Cygwin stuff, Java + R applications, VMWare client, Elusiva Terminal Server pro, Nagios client. Not sure if this might be related with any of that software (e.g. Elusiva). Trying to debug this, there was nothing visible in Windows Event log, other logs in C:\Windows, VMWare events etc. Unfortunately the vmware.log file ends with "Log throttled". We found that we ran into 2 VMWare bugs there: The VMWare client writes lots on bogus messages in the vmware.log, which we now disabled (log level error setting) plus the bug that VMWare does not unthrottle the log (at least so far despite VM reboots). I know there is not much guidance and that may also be the reason why I so far didn't find anything related on the web or on ServerFault, but maybe some of this rings a bell with someone? Or please direct me to what more info to post. I hope that the vmware.logs get unthrottled eventually (can't easily restart the hosts at the moment). Thanks for any input!

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• linux kernel buffer memory is zero

  - by user64772

  Hi all. There are one qestion that i can`t find in google. I have many linux boxes mostly with SLES or openSUSE, diffrent versions and kernels. On some of them i faced with slow oracle transactions problem. It time to time problem and when i log in the box on that time i see that oracle blocked in kernel function sync_page # while :; do ps axo stat,pid,cmd,wchan | egrep '^D|^R'; echo --; sleep 5; done D 3483 hald-addon-storage: polling ide_do_drive_cmd Ds 4635 ora_dbw0_orcl sync_page Ds 4637 ora_lgwr_orcl sync_page Ds 4639 ora_ckpt_orcl sync_page D 11210 oracleorcl (LOCAL=NO) sync_page D 12457 [smtpd] sync_page R+ 12458 ps axo stat,pid,cmd,wchan - -- Ds 4635 ora_dbw0_orcl sync_page Ds 4637 ora_lgwr_orcl sync_page Ds 4639 ora_ckpt_orcl sync_page D 11210 oracleorcl (LOCAL=NO) sync_page R+ 12501 ps axo stat,pid,cmd,wchan - -- Ds 4635 ora_dbw0_orcl sync_page Ds 4637 ora_lgwr_orcl sync_page Ds 4639 ora_ckpt_orcl sync_page D 11210 oracleorcl (LOCAL=NO) sync_page R+ 12535 ps axo stat,pid,cmd,wchan - -- Ds 4635 ora_dbw0_orcl sync_page Ds 4637 ora_lgwr_orcl sync_page Ds 4639 ora_ckpt_orcl sync_page D 11210 oracleorcl (LOCAL=NO) sync_page R+ 12570 ps axo stat,pid,cmd,wchan - -- so i think that box is run out of memory for disk buffers but memry is fine total used free shared buffers cached Mem: 4149084 3994552 154532 0 0 2424328 -/+ buffers/cache: 1570224 2578860 Swap: 3148700 750696 2398004 i think that this is the problem, buffer is zero and we must write directly to disk, but why buffer is zero ? - i try to google it and find nothing - is anyone can help ?

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• Debian on HP ProLiant server hangs (disk i/o is my guess)

  - by Martin

  I installed Debian (2.6.32-5-amd64) on my HP ProLiant MicroServer (purchased recently.) I also added 3 2tb hd in zfs. I've experienced several server froze. Sometimes it showed Soft lockup CUP stuck for 61s! Today I experienced a different problem (I think) and the message looked like this [431336.200002] Call Trace: [431336.200002] [<ffffffff812fcc7c>] ? _write_lock+0xe/0xf [431336.200002] [<ffffffff810d7a86>] ? __vmalloc_node+0x99/0xe2 : : and (in different screen) [431354.222318] Node 0 DMA32 free: 2064kB min:5520kB low:69900kB high:8280kB active_anon:181648kB inactive_anon:61728kB active_file:313152kB inactive_file:832456kB unevictable: 0kB isolated(anon): 0kB isolated(file):0kB present:1922596kB mlocked:0kB dirty:72kB writeback:0kB mapped:25620kB shmem:344kB slab_reclaimable:34460kB slab_unreclaimable:31400kB kernel_stack:2288kB pagetables:7556kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no [431354.222431] lowmem_reserve[]: 0 0 0 0 : : Is this a hardware problem? What tools/methods can I find out the source of the problem? I've used Debian for years but never had problem like this.

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• VMworkstation Windows 7 vm from physical partition?

  - by rich

  Hi All, i have a machine with 2 disks. my secondary drive has two partitions, one of which is a windows 7 64 boot partition. I have VM workstation and i would like to make a VM from the physical partition (described above). Ideally this would boot from the live disk, but if i can make a vmdk from the two partitions on the secondary drive that would be fine. 1 issue is the drive is 140gig raptor of which the two partitions i want are 40g and 30g partitions. the rest of the space is unallocated. So if i make a vmdk i really need it to be fixed at say 80 gig. I have converter but i don't understand how i can make the vmdk using this... specs Drive 1: this drive is a 120 SSD, running the host OS (Windows 7 64bit) - i've got 95 gigs free on this Drive 2: 140 gig raptor, partition 1 40g is also a windows 7 64bit install, partition 2 is 35 gig with program files folder on it.. sorta of needed to get the vm to work. There is 65gig unallocated on this disk. Drive 1 will host drive 2 as a VM.. my hope.

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• What's the proper way to prepare chroot to recover a broken Linux installation?

  - by ~quack

  This question relates to questions that are asked often. The procedure is frequently mentioned or linked to offsite, but is not often clearly and correctly stated. In an objective to concentrate useful information in one place, this question seeks to provide a clear, correct reference for this procedure. What are the proper steps to prepare a chroot environment for a recovery procedure? In many situations, repairing a broken Linux installation is best done from within the installation. But if the system won't boot, how do you fix it from within? Let's assume you manage to boot into an alternate system. Once there, you need to access your broken installation in order to fix it. Many recovery How-Tos recommend using chroot in order to run programs as if you are actually booted into the broken installation. What is the basic procedure? Are there accepted best-practices to follow? What variables need to be considered in order to adapt the basic preparation steps to a particular recovery task? As this is Community Wiki, feel free to edit this question to improve it as well.

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• Faster caching method

  - by pataroulis

  I have a service that provides HTML code which at some point it is not updated anymore. The code is always generated dynamically from a database with 10 million entries so each HTML code page rendering searches there for say 60 or 70 of those entries and then renders the page. So, for those expired pages, I want to use a caching system which will be VERY simple (like just enter a record with the rendered HTML and (if I need) remove it). I tried to do it file-based but the search for the existence of a file and then passing it through php to actually render it , seems like too much for what I want to do. I was thinking of doing it on mysql with a table with MEDIUMBLOBs (each page is around 100k). It would hold about 150000 such records (for now, at least). My question is: Would it be faster to let mysql do the lookup of the file and the passing to php or is the file-based approach faster? The lookup code for the file based version looks like this: $page = @file_get_contents(getCacheFilename($pageId)); if($page!=NULL) { echo $page; } else { renderAndCachePage($pageId); } which does one lookup whether it finds the file or not. The mysql table would just have an ID (the page id) and the blob entry. The disk of the system is a simple SATA raid 1 , the mysql daemon can grab up to 2.5GB of memory (i have a proxy running too, eating the rest of the 16GB of the machine. ) In general the disk is quite busy already. My not using PEAR cache, is because I think (please feel free to correct me on this) it adds overhead I do not need because the page rendering code is called about 2M times per day and I wouldn't want to go through the whole code each time (and yes, I have eaccelerator to cache the code too). Any pointer to what direction I should go, would be greatly welcome. Thanks!

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• please take a look at my server's ram usage

  - by user66779

  Hi, i am a noob with servers. I have a centos5.5 vps with 512mb ram. My goal is to have it host just one magento store. I've installed Magento on the server without any control panel, by just installing lamp myself and whatever php extensions were necessary to get Magento to install. As soon as i visit my magento store, suddenly the ram on the vps is almost completely used, with only about 100mb left. Please see this screenshot of htop taken after just myself visited the website. http://img714.imageshack.us/img714/1944/screenouv.png As you can see there's only around 100mb left. Is that normal? I'm wondering if i might have done something stupid with the server that makes it very resource hungry. I installed apache from the centos base repo, php version 5.3 from the ius repository and mysql 5.1 also from ius repo. I haven't changed any of the default config files for any of these except to make memory_minimum 256 in php.ini. Is there anything i can do to make more ram free? I'm clueless but i see each Apache daemon is using 8% of available ram, and AFAIK each visitor needs one Apache daemon. So i would run out of ram with just a handful of visitors. Thanks for your advice.

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• What would prevent the same ActiveX control from downloading on one internal website but not another?

  - by ProfessionalAmateur

  We have two internal webservers for an application at my company, one is the development server and the other is production. This application server will deploy and install and ActiveX control to allow the use of specific functionality. The ActiveX control is the exact same on both servers. Last week suddenly when trying to install and run this ActiveX control from the development server stopped working. IE will still prompt the user to install it, but when select "Install this Add-on for all users on this computer", nothing happens. Another IE window pops open and immediately closes and that is it. It is almost as if a pop-up blocker is running (but it is not enabled). The kicker which has me completely stumped is that if we try the same thing on the Production server, everything works as we would expect. Items of interest: Both servers are in the 'Trusted Sites' No pop-up blocker in IE is activated ActiveX controls for Trusted and Intranet Sites are all enabled. Has anyone experienced something similar? I'm not a Windows administrator so please feel free to explain things as elementary as you see fit.

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• Can I sort files A-Z and at the same time Z-A?

  - by The_Buff

  I am trying to sort and rename a large number of files that are labeled #####_## The LEFT side of the underscore are numbers (e.g., 32956715, 32956810, etc.) that do not repeat. The RIGHT side of the underscore are also numbers (e.g., 1, 2, 3, etc.) and they do repeat. (The left side is the number of a scan and the right side is the page of that particular scan.) I would like to be able to sort the left side of the underscore Z-A and the right side A-Z. Example: 3_1 3_2 3_3 2_1 2_2 2_3 1_1 1_2 1_3 I am using ReNamer by den4b (easily the best free renamer out there). It supports regular expressions so I believe there should be an easy way to do this, but I don't know how. (I've been trying to learn regular expressions but I don't use them enough to retain anything.) I'm open for any suggestions that achieve the same result. I've spent enough time trying to figure it out that I could have probably just sorted them myself already but this is a reccuring problem so hopefully someone has a solution that will save me lots of time in the long run. Thank You!

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• Downloading Emails locally with Thunderbird

  - by r_honey

  I am using Gmail (web interface) for sometime now, and have well over 20 labels and some thousand mails there archived to different labels in Gmail. Now I want to have a local copy of all my mails and following points are important in the context: The Primary mail access mechanism would continue to be Gmail web for me. I just want a backup of my mail account locally. Ideally the mails should download locally in folders named after Gmail labels (I know this is possible via IMAP but probably not by POP) After all my mails are available locally, I will delete most of them in Gmail to free up space and because I want to archive them. The mails should continue to exist locally and should not be deleted when I delete when from Gmail web interface. I would be syncing my gmail account locally let's say every month. So, the new mails that I have sent/received during this period should come over to my local mailbox in the folders named after Gmail labels. I do understand that Gmail maintains a single copy of email having 2 different labels and such email would get duplicated locally in the 2 folders and I am okay with that. Essentially you can see I just want to archive my mails from the Gmail server to a local backup and then sync (one way from Gmail to locally) new mails at regular intervals. For some points above, POP seems to be the option while IMAP seems for the others. I am really confused and need help in deciding which of POP or IMAP would suit me best. I have currently chosen Thunderbird to be my local email client but would not have a problem switching to Outlook or anything else as long as I get my desired archiving functionality.

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• How do I re-configure grub options

  - by Ash

  I've searched this topic and I can't find an article with a plausable solution, to my problem. I installed windows 7 first, with 100gb of disk space. I created the necessary partitions via windows. Then I installed Ubuntu 12.04 on the remaining 400gb of disk space. During the Ubuntu installation I installed the ubuntu boot loader on /dev/sda3 which Windows (as expected never granted me the option pre-boot for which OS I wanted to boot). So I re-installed Ubuntu on that /dev/sda3 partition, overriding the windows 7 loader. Now when I boot windows 7, it runs GNU Grub, so like an infinite loop. How can I reconfigure grub to say: /dev/sda is the bootloader. /dev/sda2 is Windows. /dev/sda3 is Ubuntu. Re-installing windows and my partitions isn't an option, purchasing software for windows isn't an option (theres a reason I use linux, it's not because it's free, because you don't have to install lots of shit to get stuff working, and over-all it's a robust OS).

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• Where does Firefox store cerificates and how to delete one?

  - by majid4466

  Hi all, The root cause of my problem is not known to me, whatever it is, I experience frequent DNS failures. When it happens I cannot browse to my Gmail inbox. I use two DNS settings. One is the public DNS server offered by OpenDNS, and the other is Google's free DNS server. When this happens I switch from the active setting to the other one and the problem goes away. But there is a side effect to this. When browsing to Gmail fails to load, after switching the DNS I receive an error saying the security certificate the site uses is only valid for OpenDNS. This my wild guess at what is going on: OpenDNS fails to resolve mail.google.com to its IP, My ISP sends me a page showing search results for 'mail.google.com' Since I have received some sort of page instead of a timeout, the browser, mistakenly, binds the certificate it has cached for 'mail.google.com' to the new domain. This search page is not served by https so not exception is thrown by the wrong binding After switching the DNS, the domain is correctly resolved to Gmail server's IP and since his is on https the handshake is triggered. Now, because of the wrong binding, which passed quietly as no handshake was involved, I receive the error saying the certificate used by 'mail.google.com' is only good for openDNS I don't know much about DNS, less about https and the process of establishing a secure connection. How correct is my explanation? How can I delete the wrong association and/or the certificate? Thanks for listening. P. S. The problem goes away by itself, but sometimes it takes several hours before Gmail works again.

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• Where does Firefox store cerificates and how to delete one?

  - by majid4466

  Hi all, The root cause of my problem is not known to me, whatever it is, I experience frequent DNS failures. When it happens I cannot browse to my Gmail inbox. I use two DNS settings. One is the public DNS server offered by OpenDNS, and the other is Google's free DNS server. When this happens I switch from the active setting to the other one and the problem goes away. But there is a side effect to this. When browsing to Gmail fails to load, after switching the DNS I receive an error saying the security certificate the site uses is only valid for OpenDNS. This my wild guess at what is going on: 1. OpenDNS fails to resolve mail.google.com to its IP, 2. My ISP sends me a page showing search results for 'mail.google.com' 3. Since I have received some sort of page instead of a timeout, the browser, mistakenly, binds the certificate it has cached for 'mail.google.com' to the new domain. This search page is not served by https so not exception is thrown by the wrong binding 4. After switching the DNS, the domain is correctly resolved to Gmail server's IP and since his is on https the handshake is triggered. 5. Now, because of the wrong binding, which passed quietly as no handshake was involved, I receive the error saying the certificate used by 'mail.google.com' is only good for openDNS I don't know much about DNS, less about https and the process of establishing a secure connection. How correct is my explanation? How can I delete the wrong association and/or the certificate? Thanks for listening. P. S. The problem goes away by itself, but sometimes it takes several hours before Gmail works again.

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• I just deleted my backup file! How do I save it?

  - by Sammy

  I just accidentally deleted a backup file that I need to restore my system. It's an Acronis True Image TIB file. It was stored at H:\My backups and the name of the file was File_backup_2012-10-18.tib. I did a quick scan with Recuva 1.43.623 and it found the file using the recovery wizard, but it was unable to recover it. The "state" of the file is "unrecoverable". So the resulting file is 0 byte. I am trying to do a deep scan with Recuva right now but it takes a lot of time. If it should fail, what other recovery option do I have? Is there any other good file recovery software that's free to use for home users? I do have a second copy of the whole system partition, but I needed this file backup copy because it is more up to date. That's the file, right there! But why is Recuva unable to recover it?

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• Mac OS X: Applications not responding

  - by Robot55

  This happens to me several times a day. I'll quit an app, the window will close, but the app won't finish shutting down. It stays open in the dock, and right clicking and force quit show not responding. Force quit won't work. I can't shut the app down. Starting any other app when this happens causes that app to behave in exactly the same way: the icon opens in the dock, but the app is non-responsive and can't be forced to quit. Can't access terminal when this happens, because it locks up just like all the apps. While I haven't tried to open every app, I think any app I try to open when this is happening will lock up. If I relaunch Finder, it too locks up and then the only thing left is to hold down the power button for a hard reboot. Any app that is running while this is happening will continue to run normally unless I try to shut it down. Repairing disk permissions has no effect. I also did a time machine and a full restore on a brand new MbP - and sure enough, after restore, the new MbP suffers form the same problem. Creating a new user has no effect. Any thoughts? Please help MacBook Pro 15" AG 2.53ghz i5 cpu 8gb RAM 500gb HD (over 200gb free)

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• Linux RHEL : Making disk image efficiently

  - by TheProfoundGeek

  I have a linux box having RHEL. Its disk (hda1) is having free space of about 25GB. I have an another disk (hda2) which is of 250GB having another RHEL instance, it's partitioned for 200GB. Data on the disk occupies about 21GB of data. The image of hda2 needs to be taken and restored on other disk of same specs. What is the best way to make image file of the hda2? Ideally the images size should be around 25GBs as the actual data on the disk is just 21GB. I am aware about the following two methods. Method 1 : Raw Image dd if=/dev/hda2 of=/path/to/image dd if=/path/to/image of=/dev/hda3 Question 1 : Will the above method make a gigantic image of 250GBs? Is it efficient? Method 2 : Compressed Image. dd if=/dev/hda2 | gzip > /path/to/image.gz gzip -dc /path/to/image.gz | dd of=/dev/hda2 Question 2 : I tried the method 2, its taking too long. What are the pit falls of this methods? Which of the above method id efficient and why? Is there any other Linux utility which can do the job? Third party tools are no no.

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