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• Internal/External Moodle - DNS

  - by Chief17

  Network diagram: I have a moodle (a VLE) setup that I want to be internally and externally accessible. The green route on the diagram below is the route I would like the traffic to take when the user is inside the LAN, and the red route is seemingly what it does take. The website has a domain name (like most websites do). From the User PC, if I ping the domain name, I get the internal IP of the webserver (because of a hosts file entry), if I nslookup the domain name I also get the internal IP of the webserver (because of an A record on my DNS server). Running the same two commands on the webserver gives me the webservers external IP. (going well so far) If I use PHPs gethostbyname() on the moodle website and use domain name as a parameter (getting php/apache to resolve the hostname) it returns the exernal IP of the webserver (good news, DNS seems to be doing what I want it to). All things so far seem to be going well. The only thing that is confusing me and preventing the moodle single sign on from working is the fact that if I get moodle to show my IP address, it says that it is an external one (outside my NATting firewall) when it should show an internal IP. This is the issue, any ideas on how to go about resolving this? Any ideas on tests I can perform (I have also tried a tracert and the request goes directly to the webserver), anything? Thanks all!

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• Windows 7 VPN Error 619

  - by TravisPUK

  So I am running Windows 7 Enterprise. This morning I was able to VPN using the built in VPN (Connect to Work Network etc). I had to change my network's IP address range and now the VPN will not work. It just stalls on the Verifying user name and password... message. But then it returns the 619 error. Anybody know why changing my machine's IP address would cause this problem? Where should I be looking to try and fix this issue? I have tried this on a Windows XP machine that also had the IP address range change and this still connects fine using exactly the same connection details. EDIT The internal network range changed from 192.x.x.x to 10.x.x.x. This was done on the entire Active Directory. All machines are running fine and the Windows XP machine, that works going to the same client VPN mentioned above is on the same network. Both the XP and the Win 7 machines are using DHCP served by the Domain Controller. The client domain is not performing any IP range checks/restrictions. The VPN is outside the internal network, connection is being made via the Internet and not passing through any other machine, other than the normal domain machines, ie DNS etc. This is passing through a router and the router has the relevant VPN passthrough options configured. All internal machines are working correctly with other forms of VPN, ie Cisco, Sonic etc (these were tested on other machines, they are not installed on the Vista or Win7 machines). After further testing, this is occurring on all Win7 and Vista machines where they can no longer connect to the client VPN, however all XP machines can still connect fine. This has been tested on three Vista, two Win7 and five XP machines. All machines are on DHCP and tests have been done with both the firewalls turned on and off, as well as with fixed IPs being used. Thanks Travis

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• Implications of disabling the AMD Phenom's TLB patch?

  - by DMA57361

  I'm currently running a AMD Phenom X4 9600 processor (yeah, it's aging a bit, but other recent problems mean it's not getting upgraded in the immediate future), which happens to be one of the chips that suffer from the TLB errata. I recall that the first time I played with disabling the TLB patch (probably over a year ago, while playing a game that had a severe performance problem such that it was almost unplayable unless the patch was disabled) I had at least one BSOD, but I can't remeber them being particularly frequent. However, because it decreased instability, I stopped disabling the patch once I was done with the game. Now, after some recent hardware changes I was experiancing much worse performance than expected from the new hardware under some circumstances, and the TLB jumped to mind - after testing I found that disabling the patch would improve the performance to expected levels. I'm now wondering if it's worthwhile always having the patch disabled to avoid any potential slowdowns cropping up in the future, or if it is too dangerous. Everything I read states that the bug, when not patched, can causes a system lock-up in "rare circumstances". So, with the TLB patch disabled: How frequently should system lock-ups be expected? Do we know what the circumstances that trigger the lock-ups are? (Don't worry too much about being highly technical, but essentially I wonder if the chip more vunerable under heavy load, or heavy memory usage, etc?) Are there any secondary problems I should be aware of? (Don't include things that are charateristic to all lock-ups, please)

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• How private is the Opera Turbo feature of Opera?

  - by Marcus V

  If I'm using Opera with the Opera Turbo feature turned on (always, not set to "automaticly"). Can anyone see what sites I'm visiting (except Opera of course ...)? Opera Turbo uses a proxy server, so it should be that way, but as a not very technical person I'm not sure. Why do I want this? Well: nowadays, at least in my country, more and more (legal) open Wi-Fi connections are available. In those environments I like to have more privacy protections. I don't mind if they can see my IP address, but I just want to hide as much as I can of what I am doing. BTW: I don't care that they can see the data transferred; it doesn't have to be that secret. I only want to hide the requested Internet site links. BTW: I know that Opera Turbo only works with non-secure websites (HTTP), but that's fine for me. I only want it to work with these sites. BTW: I'm not need this for illegal purposes; I only want this for privacy reasons.

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• How can I debug solutions in Visual Studio 2010 from a network share?

  - by alastairs

  I've recently got a new Mac laptop and am running VS2010 in a Parallels virtual machine. It's mostly working out well for me, but I'm having some problems with debugging specific project types, related to the fact that the projects are being accessed via a network share. Test projects don't run because the test runner can't load the tests' DLL. Web projects fail to run in the Visual Studio mini web server, throwing the following exception: 'An error occurred loading a configuration file: Failed to start monitoring changes to path\to\web.config'. I've spent the evening trawling the web with little luck on this. After reading these two posts, I tried out the usual CasPol changes, but then found this post from one of the early VS2010 betas indicating that CasPol is no longer needed/supported in .NET 4.0 and VS2010. The network share is accessible via both a mapped drive and the UNC path. The virtual machine runs its applications under the administrator account, which appears to have all the necessary permissions on the network share to create, read, write and delete files and folders. I say "appears to have" as I can't view the Security Properties of the appropriate folder via Explorer: the Security tab just isn't present. Has anyone managed to successfully load and debug web and test projects from a network share in VS2010?

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• How to best tune my SAN/Initiators for best performance?

  - by Disco

  Recent owner of a Dell PowerVault MD3600i i'm experiencing some weird results. I have a dedicated 24x 10GbE Switch (PowerConnect 8024), setup to jumbo frames 9K. The MD3600 has 2 RAID controllers, each has 2x 10GbE ethernet nics. There's nothing else on the switch; one VLAN for SAN traffic. Here's my multipath.conf defaults { udev_dir /dev polling_interval 5 selector "round-robin 0" path_grouping_policy multibus getuid_callout "/sbin/scsi_id -g -u -s /block/%n" prio_callout none path_checker readsector0 rr_min_io 100 max_fds 8192 rr_weight priorities failback immediate no_path_retry fail user_friendly_names yes # prio rdac } blacklist { device { vendor "*" product "Universal Xport" } # devnode "^sd[a-z]" } devices { device { vendor "DELL" product "MD36xxi" path_grouping_policy group_by_prio prio rdac # polling_interval 5 path_checker rdac path_selector "round-robin 0" hardware_handler "1 rdac" failback immediate features "2 pg_init_retries 50" no_path_retry 30 rr_min_io 100 prio_callout "/sbin/mpath_prio_rdac /dev/%n" } } And iscsid.conf : node.startup = automatic node.session.timeo.replacement_timeout = 15 node.conn[0].timeo.login_timeout = 15 node.conn[0].timeo.logout_timeout = 15 node.conn[0].timeo.noop_out_interval = 5 node.conn[0].timeo.noop_out_timeout = 10 node.session.iscsi.InitialR2T = No node.session.iscsi.ImmediateData = Yes node.session.iscsi.FirstBurstLength = 262144 node.session.iscsi.MaxBurstLength = 16776192 node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144 After my tests; i can barely come to 200 Mb/s read/write. Should I expect more than that ? Providing it has dual 10 GbE my thoughts where to come around the 400 Mb/s. Any ideas ? Guidelines ? Troubleshooting tips ?

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• Can Subject Alternative Name accommodate multiple virtual mail domains?

  - by Lawrence

  I am currently running a postfix server with self signed certificates serving one mail domain, mycompany.com, the mail server is mail.mycompany.com and so is the CN of the certificate. Now, I need to add a new domain to it. The new domain name is mycompany.net to the same server. Since the users already have the root of the old certificate, I'd like to reuse that. However, I'd like to issue a new certificate so users using the SMTP from Outlook/Thunderbird of mail.mycompany.net do not get warnings. If I understand correctly, if I issue a new certificate with CN=mail.mycompany.com and a subjectAltName=DNS:mail.mydomain.net and have postfix serve this, the client will not complain either way about the cn not matching the target host name. Am I correct in this assumption or am I misunderstanding the concept of Subject Alternative Name? Just to avoid conversation, I do not want to have users on mycompany.net addresses use the mycompany.com server because I might (not a technical issue) have to split up into two different locations, and I want to produce an easily migrateable setup.

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• How to open semicolon delimited CSV-files in US-version of Excel

  - by Holgerwa

  When I double-click on a .csv file, it is opened in Excel. The csv-files have columns delimited with semicolons (not commas, but also a valid format). Using a German Windows/Excel setup, the opened file is displayed correctly, the columns are separated where the semicolons existed in the csv-file. But when I do the same on an (US-) English Windows/Excel setup, only one column is imported, showing the whole data including the semicolons in the first column. (I don't have an English setup available for tests, users have reported the behavior) I tried to change the list separator value in Windows regional settings, but that didn't change anything. What can I do to be able to double-click-open those CSV-files on an English setup? EDIT: It seems to be the best solution not to rely on CSV-files in this case. I was hoping that there is some formatting for CSV-files that makes it possible to use them internationally. The best solution seems that I'll switch to creating XLS-files. Thanks to all for your suggestions and helpful tips!

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• Strange behaviour when creating/deleting subdomains

  - by Saif Bechan

  This can be a DNS cache issue from my local machine, but I am not sure. This is what happens. I have a domain that does not use wildcard subdomains, so they have to be created. Without creating the domain, and I point my browser to test.domain.com, I get a page server not found. Now when I create the subdomain, I keep getting the same problem. Now when I first create the domain, without ever visiting the page, I get the normal page, but now when I delete the subdomain, it never goes away. Can this be a DNS cache issue, I am working on a shared environment, maybe the router has a cache but I doubt that. Can this have something to do with my setup. I have tried to use the Google DNS hosting, but this gives me the same results. I have also tried some tools that clear my local DNS cache, they were some add-ons for FireFox. Anyone have any ideas what can be the problem. Are there any tests I can do to see if there is some kind of cache between me and the server.

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• slicehost google apps mx settings

  - by Bob

  Hello All, I am banging my head against the wall on this one. I followed the MX setup tutorials for Google Mail and it didn't work. Currently, after deleting those records and adding the ones google suggested I have domain.com. 86400 IN MX 10 ASPMX.L.GOOGLE.com. domain.com. 86400 IN MX 20 ALT2.ASPMX.L.GOOGLE.com. domain.com. 86400 IN MX 20 ALT1.ASPMX.L.GOOGLE.com. domain.com. 86400 IN MX 30 ASPMX2.GOOGLEMAIL.com. domain.com. 86400 IN MX 30 ASPMX5.GOOGLEMAIL.com. domain.com. 86400 IN MX 30 ASPMX3.GOOGLEMAIL.com. domain.com. 86400 IN MX 30 ASPMX4.GOOGLEMAIL.com. according to the output of my dig command for my particular "domain". I can send email from google apps mail but I can not recieve any email. It gives me the following error: Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 #5.1.0 Address rejected [email protected] Now I already tried following the slicehost MX article instructions straight as well and they did not work out for me. The domain has already been verified by google and it says the email is activated from their end. Any help would be appreciated : )

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• KVM and JBoss Java Application Server

  - by Jason

  We have a large Xen deployment running on both RHEL and CentOS and have recently started looking at KVM since this is where it looks like the future of VM's are on Linux. We can load the server and get everything running without an issue. However when we load up a new one with JBoss (4.2 Community edition, Sun JDK 6) and load a large EAR the server goes a little crazy. The %sy will jump to 80-99% and just hang for large periods of time we see a similar jump in %us on the host machine. We though at first this might be I/O as it seems to happen at start of JBoss but then would "cool down" after everything got loaded. We did some tests by extracting some large tar.gz files and using jar -xvf on the ear but could not re-create. Then we starting thinking this might be some type of memory access issues. We loaded a c-program that would generate a lot of memory activity and sure enough we saw the spikes again. Not as high mind you but we did see it jump. We then wrote a small java program to do the same thing and sure enough we saw it jump again. Any thoughts on what might be causing this? Is this just the way KVM works? As a side note we do NOT see this behavior on any other setup. Xen, VMWare and/or native iron. The system does seem a bit slower than our Xen / VMware ones.

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• What to look for in a reliable backup hard disk?

  - by Senthil

  I want to buy an internal hard disk and use a docking station along with it for backing up important data. The size will be around 500GB to 1TB. I have a budget and several models fit into it. So far, they only seem to vary in size, speed and brand. These are the only things I can compare from the specs. I guess asking for which brand is best is completely subjective so I won't do that. I want my disk to have long life and be reliable. Doesn't matter if it is somewhat slow. Size: Should I go for the one with highest size within my budget? Will higher density cause problems? Or should I go for a moderately sized one? Does the number of platters have an impact? Speed: I do not want high performance. I want it to be reliable and last long. I am definitely not going to choose the expensive 10,000 rpm ones. Should I go for 5400 or 7200? Do these numbers affect longevity and reliability? Are there any other technical and objective factors that I should look for?

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• finding the best network latency between two countries

  - by Yoav Aner

  I know there are many tools to test for bandwidth and latency, but they all rely on having at least one host from which you can run those tests. I wonder whether there's an online source or some other way to guestimate the latency or speed between two countries (in general). For example, would a customer in Japan get lower latency if the server is located in Singapore or Australia? Is a user in India likely to get higher download speed from a server in the UK or in the US? Are there any online resources or some clever ways to answer those questions with a reasonable degree of accuracy? [UPDATE]: Thanks for the great suggestions from Raffael Luthiger. I didn't know about those looking glass servers. The submarine cable maps were also really cool to discover (Thanks to Jesper Mortensen). Also seems really wise if I could ask those network professional in the area for their experience, but obviously I don't have access to those. At least some of them are on SF :) However, I'm still a little unsure how to combine those resources to give me some measurements. This is the information I have: Two countries (A,B). I do have IP addresses of customers in country A (I can obtain those from the web server log files for example). Presumably I can find some looking glass servers in country B and run a trace to those IPs. What's the best measurements to use? Are there any scripts that help automate at least some of this process?

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• ZFS with L2ARC (SSD) slower for random seeks than without L2ARC

  - by Florian Kruse

  I am currently testing ZFS (Opensolaris 2009.06) in an older fileserver to evaluate its use for our needs. Our current setup is as follows: Dual core (2,4 GHz) with 4 GB RAM 3x SATA controller with 11 HDDs (250 GB) and one SSD (OCZ Vertex 2 100 GB) We want to evaluate the use of a L2ARC, so the current ZPOOL is: $ zpool status pool: tank state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM afstank ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c11t0d0 ONLINE 0 0 0 c11t1d0 ONLINE 0 0 0 c11t2d0 ONLINE 0 0 0 c11t3d0 ONLINE 0 0 0 raidz1 ONLINE 0 0 0 c13t0d0 ONLINE 0 0 0 c13t1d0 ONLINE 0 0 0 c13t2d0 ONLINE 0 0 0 c13t3d0 ONLINE 0 0 0 cache c14t3d0 ONLINE 0 0 0 where c14t3d0 is the SSD (of course). We run IO tests with bonnie++ 1.03d, size is set to 200 GB (-s 200g) so that the test sample will never be completely in ARC/L2ARC. The results without SSD are (average values over several runs which show no differences) write_chr write_blk rewrite read_chr read_blk random seeks 101.998 kB/s 214.258 kB/s 96.673 kB/s 77.702 kB/s 254.695 kB/s 900 /s With SSD it becomes interesting. My assumption was that the results should be in worst case at least the same. While write/read/rewrite rates are not different, the random seek rate differs significantly between individual bonnie++ runs (between 188 /s and 1333 /s so far), average is 548 +- 200 /s, so below the value w/o SSD. So, my questions are mainly: Why do the random seek rates differ so much? If the seeks are really random, they should not differ much (my assumption). So, even if the SSD is impairing the performance it should be the same in each bonnie++ run. Why is the random seek performance worse in most of the bonnie++ runs? I would assume that some part of the bonnie++ data is in the L2ARC and random seeks on this data performs better while random seeks on other data just performs similarly like before.

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• Using Toshiba 22EL833 as PC display with GTX8800

  - by Oleg V. Volkov

  I had another Toshiba TV - 19SL738 - connected to this same PC and video card (GTX 8800) through DVI<-HDMI (DVI on PC side, HDMI on TV) before, that was working perfectly at it's native resolution 1360x768. Some time ago I had to change to 22EL833 and immediately faced problem with Windows 7 control panel and NVIDIA control panel both reporting native resolution for new TV as 1080i, 1920x1280, despite TV documentation saying that it have same 1360x768 as previous one. Practical tests confirmed that true native resolution is indeed 1360x768, because plugging in through DVI<-VGA and setting custom resolution through NVIDIA panel shown clear colors and crisp image, while setting anything different with either DVI<-VGA or DVI<-HDMI produced horribly distorted or squished images, with almost unreadable slim lines (as in letters, for example). Now, my problem is that there's no drivers for this TV and I'm unable to get good image while connecting it through DVI<-HDMI directly. The best I've achieved is editing EDID/driver manually, to persuade system that native resolution should be 1360x768, and while image became mostly clear, colors turned to some strange washed out effect, with pools of pure yellow, cyan and magenta there and there filling place of other colors. Gradients also became noticeably stripped as well. Somehow it looks like dithering gone bad and makes me suspect that image is still down/upscaled several times internally somewhere along the line. How can I connect this TV to DVI output of my video card to get best possible clear image, correct colors and correct native resolution?

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• Sony PMB causing failure to load Windows 7 Pro 64-bit normally or even Safe Mode

  - by Wesley

  After installing Sony's Picture Motion Browser on my desktop with Windows 7 Pro x64, it always goes to Startup Repair due to Windows 7 failing to start. This always happens after I try to install it. I've installed with all unnecessary programs closed and all disk drives and unnecessary usb ports empty. I don't exactly know what is causing the problem. Any ideas? My desktop is an HP m8530f. http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01469325&tmp_task=prodinfoCategory&lc=en&dlc=en&cc=us&product=3740333&lang=en Only upgrades are an HD4350 and a 500W PSU. EDIT: Windows 7 cannot start now. I'm currently running diagnostic tests from the BIOS. EDIT: Here are the problem details. Problem Signature: Problem Event Name: StartupRepairOffline Problem Signature 01: 6.1.7600.16385 Problem Signature 02: 6.1.7600.16385 Problem Signature 03: unknown Problem Signature 04: 21201022 Problem Signature 05: AutoFailover Problem Signature 06: 8 Problem Signature 07: CorruptFile OS Version: 6.1.7600.2.0.0.256.1 Local ID: 1033 CONCLUSION: So, I think Sony PMB may have caused some sort of corruption in the system files. So if you have Windows 7 and plan on installing Sony PMB, find a Vista or XP machine to install on.

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• Motion - takes snapshot without motion detected

  - by Emmanuel Brunet

  I've been installed the standard motion 3.2.12 package on debian 7.5. I would like to get snapshot ONLY when motion is detected, but it still saves a picture every second without any activity in front of the camera. I'm using a TENVIS JPT3815W IP camera motion.conf here is my configuration file setup_mode off target_dir /media/videos/log/webcam netcam_url http://webcam/snapshot.cgi netcam_tolerant_check on netcam_userpass admin:alpha1237 # Output frames at 1 fps when no motion is detected and increase to the # rate given by webcam_maxrate when motion is detected (default: off) webcam_motion off output_all off # detection settings 1-255 default 32 noise_level 50 # Maximum framerate for webcam streams (default: 1) webcam_maxrate 25 pre_capture 0 framerate 25 gap 30 locate on mail [email protected] text_right "FRONT CAMERA %Y/%m/%d - %T" text_double on ffmpeg_cap_new on ffmpeg_cap_motion on ffmpeg_video_codec mpeg4 output_motion off snapshot_interval 0 # Quality of the jpeg (in percent) images produced (default: 50) quality 90 # Restrict webcam connections to localhost only (default: on) webcam_localhost off # Limits the number of images per connection (default: 0 = unlimited) # Number can be defined by multiplying actual webcam rate by desired number of seconds # Actual webcam rate is the smallest of the numbers framerate and webcam_maxrate webcam_limit 0 Issue when I start motion images are stored in /media/videos/log/webcam nearly every second. I hjust want to get images when a motion is detected and the according video clip Any idea where the configuration fails ?

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• Resize a RAID 1 volume on OS X Snow Leopard - how? (Note: software raid)

  - by Emmel

  I've scoured the Internet in search of an answer to this question, and as usual with OSX-related topics, I often don't find any deep-dive technical explanations sufficient enough to feel confident doing dangerous things. Here is my question: I have a Mac Pro, running OS X 10.6.2. I have, as my main root/boot disk, a RAID 1 volume called "Mirror1". Mirror1 is comprised of two 1 TB disks. Mirror1, however, is fixed at 640 GB. That's because, I originally took a 640GB disk, bought a terabyte disk, mirrored it (using diskutil appleraid enable), when it synced I removed the 640GB and replaced it with a second 1 TB disk, and synced again. Voila! A single 640 GB replaced by two 1 TB disks in a mirror.. Actually, no. There's still something missing from the equation: Mirror1 needs to be expanded from 640GB to 1 TB to match the partition sizes on each of those disks. How do I do this? Perhaps the diskutil output will help: -> diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk0 1: EFI 209.7 MB disk0s1 2: Apple_RAID 999.9 GB disk0s2 3: Apple_Boot Boot OSX 134.2 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI 209.7 MB disk1s1 2: Apple_RAID 999.9 GB disk1s2 3: Apple_Boot Boot OSX 134.2 MB disk1s3 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *640.1 GB disk2 1: EFI 209.7 MB disk2s1 2: Apple_HFS Mac Disk 2 536.7 GB disk2s2 3: Microsoft Basic Data BOOTCAMP 103.1 GB disk2s3 /dev/disk3 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Mirror1 *639.8 GB disk3 -> diskutil appleraid list AppleRAID sets (1 found) =============================================================================== Name: Macintosh HD Unique ID: 1953F864-B474-4EB6-8E69-41834EBD0247 Type: Mirror Status: Online Size: 639.8 GB (639791038464 Bytes) Rebuild: manual Device Node: disk3 ------------------------------------------------------------------------------- # Device Node UUID Status ------------------------------------------------------------------------------- 0 disk1s2 25109BAE-5697-40EA-B612-0217851444F7 Online 1 disk0s2 11B83AB0-8148-4DB6-8761-DEF08C855F8D Online =============================================================================== Thanks in advance.

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• How do I fix Internet Explorer / Firefox differences in Oracle JD Edwards Enterprise?

  - by CT

  Our company uses Oracle's JD Edwards Enterprise to do accounting work. We have an application consultant working for us to just deal JD Edwards but he is of non-technical background so only helps in application-specific support. All of our users should use IE 7 for JDE. About 15-20% of those users have problems which cause them to not be able to use IE 7. So those problematic users use firefox. For the most part firefox works fine but there are a few issues. Some menus / options within JDE that are present in IE 7 are not present in firefox. If I could get all of our users working under IE 7, all the firefox issues would be mute points. I have cross referenced Internet Options settings from a working IE 7 user and a non-working IE 7 user. All settings seem to be mirrored. I'm not sure how to go about continuing to troubleshoot this issue. So not only answers but just suggestive ideas for attack would be appreciated. Thanks

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• Testing for disk write

  - by Montecristo

  I'm writing an application for storing lots of images (size <5MB) on an ext3 filesystem, this is what I have for now. After some searching here on serverfault I have decided for a structure of directories like this: 000/000/000000001.jpg ... 236/519/236519107.jpg This structure will allow me to save up to 1'000'000'000 images as I'll store a max of 1'000 images in each leaf. I've created it, from a theoretical point of view seems ok to me (though I've no experience on this), but I want to find out what will happen when there will be directories full of files in there. A question about creating this structure: is it better to create it all in one go (takes approx 50 minutes on my pc) or should I create directories as they are needed? From a developer point of view I think the first option is better (no extra waiting time for the user), but from a sysadmin point of view, is this ok? I've thought I could do as if the filesystem is already under the running application, I'll make a script that will save images as fast as it can, monitoring things as follows: how much time does it take for an image to be saved when there is no or little space used? how does this change when the space starts to be used up? how much time does it take for an image to be read from a random leaf? Does this change a lot when there are lots of files? Does launching this command sync; echo 3 | sudo tee /proc/sys/vm/drop_caches has any sense at all? Is this the only thing I have to do to have a clean start if I want to start over again with my tests? Do you have any suggestions or corrections?

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• Paid antivirus solutions for Windows

  - by AP Erebus

  NOTE: If your looking for recommendations on free antivirus, check this question: http://superuser.com/questions/2/free-antivirus-solutions-for-windows Much like the above, I'm curious to opinions on the best PAID antivirus solution, personal or commercial. Enterprise solutions are welcome and as much detail regarding costs is welcome. Personally I'm looking for a licence that will grant me more than 1 computer install and quality technical support, for personal use. as in the free antivirus question: See if your antivirus of choice is already listed. Chances are it is. If you spot an answer that mentions one you already use, vote that up if you think it's a good solution. If you know of a feature or drawback not listed, or can include experiences in dealing with it, please edit the answer accordingly. If you know of any that can also be used at work please point this out. This covers all Windows platforms from XP, Vista and Windows 7. If you see an existing entry that needs an update or to add your testimonial, please do.

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• What ways are there to set permissions on an Exchange 2003 mailbox?

  - by HopelessN00b

  I'm having a difficult/impossible time tracing down a permissions issue on an Exchange 2003 mailbox, and I was wondering if I'm missing any technical possibilities here. The basic question is what ways are there to set a user's permissions to access a mailbox in Exchange 2003? I know of two. Permissions on the mailbox itself (Mailbox Rights) and having delegated rights. And then, if it's possible, how would one view all the permissions (including delegated permissions) on the mailbox? The situation is that a new user who's been set up "exactly like all the others" in his department (pretty sure he was copied via the right click option in ADUC, in fact) can't access a specific shared mailbox, which I've been assured about a dozen other people do have access to and access on a regular basis. As to how they got permissions to the mailbox, no one knows, so it must have been granted by a white wizard whose spell has since worn off, so now IT has to handle it instead. Anyway... This mailbox is a normal AD user, created as a service account, for which no one knows the password (of course), so it's probably not the case that this service account was being used to delegate permissions. Upon taking examining the Mailbox Rights directly... Here are the permissions I see: This leads me to believe that one of two things are happening - the managers have been delegating full mailbox permissions to the rest of the department, or everyone's logging in using... not their own account. But, before I get too excited about the prospect of busting out the LART and strolling over to that department, I want to make sure I'm not missing another possible explanation. Like most of the rest of the world, I ditched Exchange 2003 at the earliest possible opportunity, and had been looking forward to never seeing it again, so I'm a bit rusty on the intricacies of how it [mostly, sort of] works. Anyone see any or possibilities, or things I may have missed, or does the LART get to come out and play?

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• How to Re-install an App that Shows up in the Appstore as 'Update' Instead of 'Buy App'

  - by Craig Reville

  So long story short: I dropped the wrong app into 'clean my mac' and I hit 'cancel' but it was too late by that point. I rebooted and appstore said it had an update, when I opened appstore it was showing an update for the app I just uninstalled. I tried clicking 'update' but it gives me an error saying it's unable to install after 'downloading'. When I try to go into 'purchased apps' it shows the app as uninstalled so I click 'install' and I get an error saying it's already installed. I'm running Lion OS X, latest version, updated, mac book pro is only a few months old. I tried searching through the entire system to remove all traces of the app, after rebooting appstore no longer shows the app and no longer shows the update but on the apps page it still says 'Update'. I tried reinstalling the app from desktop OUT of the appstore and again says the app is 'already installed'. So after reading more about lion I found an article that spoke about 'BundleID' being the thing that tells appstore what's installed and needing updating however I can't find the location of where the BundleID would be. Any thoughts? I've tried CCleaner, AppCleaner etc and none of them show the app, mainly because it is uninstalled. Update I've spoken to Apple Support who confirmed that there is a file in the system that connects separately to tell the system if there are updates available however they declined to inform me of any further details. Apple also referred me from technical support to iTunes App Store opposed to Mac App Store support and from there I have been referred to AppleCare who are currently 'investigating' this issue. Hopefully there will be a fix that's simple to implement for people having similar issues, this appears to be a more common issue than I previously thought.

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• Firefox proxy authentication with Kerberos: one service ticket per connection (Linux)

  - by Dari

  I am trying to enable proxy authentication via Kerberos for Firefox. The setup is: Active Directory domain (for LDAP and Kerberos; this works and I can log in the computer and get Kerberos tickets without problems) Microsoft Windows witness machine (on which Firefox runs fine with no ticket problem) CentOS 6.3 system with Firefox (the tests were performed with both the 10.0.1 ESR found in the CentOS package repositories and the 15.0.1 downloaded from Mozilla's website) BlueCoat proxy with Kerberos authentication enabled For the moment, Firefox requests an element of a website, gets an HTTP error code of "407 Proxy Authentication Required" from the proxy, gets a ticket granting service (TGS) from the domain for the proxy and performs the request again while passing the ticket. The transaction runs fine. However, when more elements are requested (in parallel), Firefox requests one more ticket per proxy connection. And this takes many DNS queries, Kerberos interactions with domain controllers and costs a lot of time (for example, the home page of Adobe takes several minutes to load and at the end, I have about 30 valid Kerberos tickets). I am stuck on this since a while, and help would be greatly appreciated. Minor information: the CentOS operating system is virtualized with VMware Player 3.1.3, but I do not think this would be a game changer.

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• Stop the constant random reboots of my GIGABYTE GA-B75M-D3V

  - by Frederic

  I've got some issues with a new system. It's rebooting constantly. The system consists of a: brand new: Gigabyte GA-B75M-D3V with F9 BIOS (latest) Intel Core i5-3470 Ivy Bridge 2x 8GB G.SKILL Ripjaws 1600MHz memory (mem-tested x-86) coming from a stable system: Creative Soundcard X-FI Titanium Asus Radeon HD4850 OCZ Vertex 3 120G SSD Sata 3 Hard disk 1TB Sata 2 ASUS Blu-ray Drive PSU 400w Connected peripherals : Toshiba tv (displayport on dvi of MB or HD4850) Wired mouse, wireless keyboard (logitech) Bluetooth usb key Azio main problem : it's not possible to read the errors from the MB. nothing on the manual neither on internet. At the beginning, I received a MB with graphic problems and the problem of rebooting. I RMA'd it. The new one doesn't have any graphic problems. but it's still constantly rebooting. I removed everything except the HD, the sound-card, the blu-ray drive and the wireless keyboard. It's still unexpectdly rebooting. I'm running a test with just the motherboard and the HD. I will update this text after the test. I've got some questions : Somebody have an idea of a test? The PSU could cause that problem? I used it a lot of years with the stable system. Update 1: BTW, if anyone has the same problem, the manual won't say it but you'll need to reset the bios between two tests (the screwdriver on the two pins) if you suspect a problem of compatibility .

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