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• What is it safe to let Revo Uninstaller cleanup leftovers?

  - by msorens

  I have been a user of Revo Uninstaller (free) for sometime and find it does a very good cleanup job with typical applications. Today I wanted to clean up my machine a bit more so I proceeded to remove Visual Studio 2005 with Revo Uninstaller. The VS installer removed the app with no issues, then Revo reported about 20,000 leftover registry keys. I am used to basically just see Arpcache and Muicache... since I am not a registry expert I had no clue about most of the 20,000 listed. So I backed up the registry then let Revo remove the 20,000. It next reported about 1500 leftover files which included my Microsoft Office applications(!) that I knew it should not be touching. So I did not delete any files with Revo. Suspecting that some of the removed keys were also Office-related, I tried to open Word and Excel, both of which knew something was up, as the installer kicked in (albeit just briefly) for each of them. At this point, since I knew there were issues, I just restored the registry and I am now (seemingly) running OK. My question, then: When is it safe to trust Revo Uninstaller? As a seasoned software professional, my own answer to this would be the obvious "When the keys it reports are something you understand and know are safe to delete" but then that makes Revo of little use except to registry experts, does it not...?

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• Outlook / Gmail 'too many simultaneous connections' error

  - by sam

  I'm just setting up Outlook for Mac, and I'm trying to add a Google Apps application for business email (Gmail). I've set it up correctly (same details worked in Mac mail). But I keep getting two errors, either or just a error asking for the username and password again. Just to confirm the user name and password are correct, although when I go into menu command Tools - Account and look in the password field for that account it's blank. But if I just click cancel on the popup asking for my username password it just continues to get mail in the background for about 30 seconds, before again asking again for the password, or showing the above error which I can click 'yes' to and again it will get the mail. But after 30 seconds it does the same thing. I've got two other accounts set up fine, one a horde account (hosted webmail using POP3) and the other a iCloud .me account running on IMAP. What might be causing this and how I can remedy it? A bit more background: the machine is a MacBook Pro running Mac OS X v10.7 (Lion). Update 2013-11-02 I've updated Outlook to SP3, but I still get the same error.

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• Exchange 2010 OWA- Open Other User Mailbox

  - by Benjamin Jones

  I just started working for this small firm (30 people) a little bit ago, replacing their System Admin. First thing I noticed was Exchange Server 2010 was WAY out of date. Believe it or not they did not have SP1 installed. So after I installed and configured Exchange 2010 SP3 and redirected OWA I noticed something in OWA. I could add ANYONE's User Mailbox WITHOUT giving mailbox premission. I created a couple test users, same thing. I even had another employee provide me access to their OWA and they could open anyone's Inbox without granting permission. I don't want to play the blame game, but I was SHOCKED that this was going on. Luckly being such a small company I'll be able to cover this mistake that I did not create, BUT HOW? My guess is that I need to find out where the past System Admin went wrong in providing Full Access Permission? Or could this be a Auto-Mapping issue? I found this article: http://technet.microsoft.com/en-us/library/hh529943.aspx This might work $FixAutoMapping = Get-MailboxPermission sharedmailbox |where {$_.AccessRights -eq "FullAccess" -and $_.IsInherited -eq $false} $FixAutoMapping | Remove-MailboxPermission $FixAutoMapping | ForEach {Add-MailboxPermission -Identity $_.Identity -User $_.User -AccessRights:FullAccess -AutoMapping $false} However how do I insert the above code into Powershell? Again I was thrown into this mess and I'm just trying to iron out this tangled mess.

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• Server slowdown

  - by Clinton Bosch

  I have a GWT application running on Tomcat on a cloud linux(Ubuntu) server, recently I released a new version of the application and suddenly my server response times have gone from 500ms average to 15s average. I have run every monitoring tool I know. iostat says my disks are 0.03% utilised mysqltuner.pl says I am OK other see below top says my processor is 99% idle and load average: 0.20, 0.31, 0.33 memory usage is 50% (-/+ buffers/cache: 3997 3974) mysqltuner output [OK] Logged in using credentials from debian maintenance account. -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.1.63-0ubuntu0.10.04.1-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 370M (Tables: 52) [--] Data in InnoDB tables: 697M (Tables: 1749) [!!] Total fragmented tables: 1754 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 19h 25m 41s (1M q [28.122 qps], 1K conn, TX: 2B, RX: 1B) [--] Reads / Writes: 98% / 2% [--] Total buffers: 1.0G global + 2.7M per thread (500 max threads) [OK] Maximum possible memory usage: 2.4G (30% of installed RAM) [OK] Slow queries: 0% (1/1M) [OK] Highest usage of available connections: 34% (173/500) [OK] Key buffer size / total MyISAM indexes: 16.0M/279.0K [OK] Key buffer hit rate: 99.9% (50K cached / 40 reads) [OK] Query cache efficiency: 61.4% (844K cached / 1M selects) [!!] Query cache prunes per day: 553779 [OK] Sorts requiring temporary tables: 0% (0 temp sorts / 34K sorts) [OK] Temporary tables created on disk: 4% (4K on disk / 102K total) [OK] Thread cache hit rate: 84% (185 created / 1K connections) [!!] Table cache hit rate: 0% (256 open / 27K opened) [OK] Open file limit used: 0% (20/2K) [OK] Table locks acquired immediately: 100% (692K immediate / 692K locks) [OK] InnoDB data size / buffer pool: 697.2M/1.0G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance MySQL started within last 24 hours - recommendations may be inaccurate Enable the slow query log to troubleshoot bad queries Increase table_cache gradually to avoid file descriptor limits Variables to adjust: query_cache_size (> 16M) table_cache (> 256)

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• How to allow users to transfer files to other users on linux

  - by Jon Bringhurst

  We have an environment of a few thousand users running applications on about 40 clusters ranging in size from 20 compute nodes to 98,000 compute nodes. Users on these systems generate massive files (sometimes 1PB) controlled by traditional unix permissions (ACLs usually aren't available or practical due to the specialized nature of the filesystem). We currently have a program called "give", which is a suid-root program that allows a user to "give" a file to another user when group permissions are insufficient. So, a user would type something like the following to give a file to another user: > give username-to-give-to filename-to-give ... The receiving user can then use a command called "take" (part of the give program) to receive the file: > take filename-to-receive The permissions of the file are then effectively transferred over to the receiving user. This program has been around for years and we'd like to revisit things from a security and functional point of view. Our current plan of action is to remove the bit rot in our current implementation of "give" and package it up as an open source app before we redeploy it into production. Does anyone have another method they use to transfer extremely large files between users when only traditional unix permissions are available?

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• Permission Denied for FTP User

  - by Alasdair

  I have an FTP user whose default is /root/ftpuser This user can login fine. The user is the owner of the directory & the directory is even set to 777 permissions. But the user can't upload anything, the display is: Status: Connecting to xx.xxx.xxx.xx:21... Status: Connection established, waiting for welcome message... Response: 220---------- Welcome to Pure-FTPd [privsep] [TLS] ---------- Response: 220-You are user number 2 of 50 allowed. Response: 220-Local time is now 05:12. Server port: 21. Response: 220-This is a private system - No anonymous login Response: 220-IPv6 connections are also welcome on this server. Response: 220 You will be disconnected after 15 minutes of inactivity. Command: USER ftpuser Response: 331 User ftpuser OK. Password required Command: PASS ********* Response: 230 OK. Current restricted directory is / Command: OPTS UTF8 ON Response: 200 OK, UTF-8 enabled Status: Connected Status: Starting upload of test.html Command: CWD / Response: 550 Can't change directory to /: Permission denied Command: MKD / Response: 550 Can't create directory: Permission denied Command: CWD / Response: 550 Can't change directory to /: Permission denied Command: SIZE /btn.png Response: 550 Can't check for file existence Command: TYPE I Response: 200 TYPE is now 8-bit binary Command: PASV Response: 227 Entering Passive Mode (66,232,106,33,52,218) Command: STOR /test.html Response: 553 Can't open that file: Permission denied Error: Critical file transfer error It's a Linux CentOS 6 server. Any ideas?

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• Linux virtualization choices with graphic acceleration / video card support

  - by Urbn

  I am in the process of building a new desktop machine for work and fun. I am looking to run a undecided flavor of Linux (guessing Ubuntu) as my primary OS and several Windows installs with a Windows 7 install for .net development and gaming as virtualized environments. From my previous experiences with virtualization software in Linux I was never able to find an application that offered descent video card support / graphic acceleration etc. to be capable of playing any games within one of the virtualized environments. And since I will be investing quite a bit of money into this system for gaming I would naturally want to find the best option available to achieve this setup. So Onto my question: Is there any virtualization software available for Linux that has full video card support, graphic acceleration and capable of taking advantage of everything the video cards have to offer within the virtualized environments? Or am I stuck with running Windows 7 as my primary OS and using virtualization for Linux and the other OS's? Also I have no preference on open/closed source and price range would be up to $175.00 to support at least 3 virtualized environments.

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• tc u32 --- how to match L2 protocols in recent kernels?

  - by brownian

  I have a nice shaper, with hashed filtering, built at a linux bridge. In short, br0 connects external and internal physical interfaces, VLAN tagged packets are bridged "transparently" (I mean, no VLAN interfaces are there). Now, different kernels do it differently. I can be wrong with exact kernel verions ranges, please forgive me. Thanks. 2.6.26 So, in debian, 2.6.26 and up (up to 2.6.32, I believe) --- this works: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 flowid 1:200 Here, "kernel" matches two bytes in "protocol" field with 0x8100, but counts the beginning of ip packet as a "zero position" (sorry for my English, if I'm a bit unclear). 2.6.32 Again, in debian (I've not built vanilla kernel), 2.6.32-5 --- this works: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 at 20 flowid 1:200 Here, "kernel" matches the same for protocol, but counts offset from the beginning of this protocol's header --- I have to add 4 bytes to offset (20, not 16 for dst address). It's ok, seems more logical, as for me. 3.2.11, the latest stable now This works --- as if there is no 802.1q tag at all: tc filter add dev internal protocol ip parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 flowid 1:200 The problem is that I couldn't find a way to match 802.1q tag so far. Matching 802.1q tag at past I could do this before as follows: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 match u16 0x0ed8 0x0fff at -4 flowid 1:300 Now I'm unable to match 802.1q tag with at 0, at -2, at -4, at -6 or like that. The main issue that I have zero hits count --- this filter is not being checked at all, "wrong protocol", in other words. Please, anyone, help me :-) Thanks!

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• Laptop Randomly Turning On and Off

  - by Ian Mallett

  So, I have a pretty new laptop, and one of its quirks is that, at random times (though typically in the middle of the night), it seems to wake up from sleep mode, churn a bit, and then go back into sleep mode. I write "seems" because its fans are very loud, so it's obvious when it's not asleep, but during the time it is "on", I can't see anything on the screen. I have researched the problem somewhat, and could only find similar issues; nothing identical. In those cases, it appeared that certain devices could be responsible. Nothing is plugged into my computer during this behavior, but I nonetheless disabled every device's permission to wake the computer through the device manager. This included disabling the magic packet wake for the network (despite its only having a wireless connection). Using "powercfg /lastwake" gives an empty wake history. But, I also went through all the tasks and checked if they would wake the computer. None appeared to. The problem persisted, so, after some more research, I found this, and executed it for all power schemes on the computer. The problem persists. System: OS: Windows 7 Professional CPU: Intel 990X GPU: NVIDIA GeForce 580M/12GB RAM Motherboard: Clevo X7200 Model: NP7282-S1 (Sager-built laptop)

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• Apache Probes -- what are they after?

  - by Chris_K

  The past few weeks I've been seeing more and more of these probes each day. I'd like to figure out what vulnerability they're looking for but haven't been able to turn anything up with a web search. Here's a sample of what I get in my morning Logwatch emails: A total of XX possible successful probes were detected (the following URLs contain strings that match one or more of a listing of strings that indicate a possible exploit): /MyBlog/?option=com_myblog&Itemid=12&task=../../../../../../../../../../../../../../../proc/self/environ%00 HTTP Response 200 /index2.php?option=com_myblog&item=12&task=../../../../../../../../../../../../../../../../proc/self/environ%00 HTTP Response 200 /?option=com_myblog&Itemid=12&task=../../../../../../../../../../../../../../../proc/self/environ%00 HTTP Response 301 /index2.php?option=com_myblog&item=12&task=../../../../../../../../../../../../../../../proc/self/environ%00 HTTP Response 200 //index2.php?option=com_myblog&Itemid=1&task=../../../../../../../../../../../../../../../proc/self/environ%00 HTTP Response 200 This is coming from a current CentOS 5.4 / Apache 2 box with all updates. I've manually tried entering a few in to see what they get, but those all appear to just return the site's home page. This server is just hosting a few Joomla! sites... but this doesn't seem to be targeting Joomla (as far as I can tell). Anyone know what they're probing for? I just want to make sure whatever it is I've got it covered (or not installed). The escalation of these entries has me a bit concerned.

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• Should I embed the sRGB color profile in JPEG files?

  - by basic6

  I have a large (growing) collection of scanned images. They are TIFF files, mostly 48 bit with the Adobe RGB color space. This color profile is integrated in the files. When such a file is opened in IrfanView (with plugins), it says (Image - Information) Adobe RGB 1998. "Normal images", like the JPG files from a digital camera, do not (necessarily) have a color profile integrated in the file. I understand that it's necessary to include the Adobe RGB profile in an image file which uses the Adobe RGB space, so the color values can be interpreted correctly. Here's a test image with a completely different color profile, programs that ignore the included profile (like MSIE8 or Gwenview) will render it as sRGB (?): I'm planning to convert my TIF files to JPG, so I'm wondering if there's anything wrong with using IrfanView that would save them as sRGB without embedding the sRGB profile. I've heard that images should always be saved with the color profile included. Since every image seems to be interpreted as sRGB by default (by software without color management), I don't understand why the sRGB profile should be included?

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• Using VMware Guest OS to enable Host OS to ssh to remote network

  - by Reuben L.

  Basically I have an issue because my host OS is 64-bit Linux Mint (Ubuntu derived) and it doesn't seem to be compatible with the Juniper Network Connect that is used by the network at my workplace. Thus, I am unable to ssh from terminal to the network. I can't make changes to the workplace network either so that leaves me with looking for solutions on my end. The main reason for me to access the network from home is to check on my running processes or to issue more commands to a few workstations. Putty is the desperate choice I usually make but it means I have to reboot to Windows and also have limited control. I've tried several other methods and they have all failed. Recently, I setup a VM with Windows 7 as the guest OS. Now half my problems are fixed as I don't have to physically reboot the system - I just have to engage Juniper Network Connect on the VM. However, I would still like to use my Linux terminal to ssh to the network. It sounds plausible that I could somehow manipulate ports to connect to the remote network from the host OS tunneled through the guest OS, but I really have no clue how to do so... Can anyone help?

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• Windows Server 2008 - inexplicable system time jumps/glitches/inaccuracies

  - by Nathan Ridley

  I'm running a production web server on Windows Server 2008. On this server I have a database which logs certain user actions, but every now and again I inexplicably get database entries which, according to the record ID and the records immediately before and after, have the wrong time logged against them (7 days+ too old). For example, record ID 1001 will be for Dec 7, 11pm, 1002 will be for Dec 7, 11:01pm, then 1003 will be for Nov 28, 1:38am, then the next will be back on track again. The problem seems to occur in random records (or 2-3 records in a row) and crops up once every few days. This is absolutely baffling because there is only one place in the application that assigns this date/time value and it's simply the system UTC date. I have been synchronizing the system time to time-a.nist.gov (which I read in another article was a bit more reliable than the default time.windows.com) and it seems to occasionally get out of time anyway (3-4 minutes), but I'm speculating that occasionally the time server has a temporary glitch where the date changes to a drastically wrong value for a short space of time, then changes back. Either that, or the motherboard clock battery is screwed and the reason the time momentarily changes is that the motherboard loses the time and then the time synchronization puts it back again. Could either of my suspicions be right? Should I turn off time synchronization for a production server? Assigning dates to an event log where the dates are up to 2 weeks prior to the actual date is a severe problem I can't have when the next version of my application is released. Any suggestions or advice would be appreciated.

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• Forcing programs to be installed to another drive

  - by zyboxenterprises

  I have an SSD as my main Windows drive, with a 640GB 2.5" HDD, partitioned to store programs and user settings, and also to act as backup (it's the only thing I had lying around at the time of building my PC). The task was to make the PC as fast as possible, while having an increased storage capacity available to store normal user data, and to assist in my small data recovery business. The problem is that whenever I install a program, it installs to C:\Program Files [(x86 for the 32 bit programs]\, although I have changed the environment variables. This wouldn't normally be an issue, however every installation program points its shortcut to my 640GB HDD. The root layout of both drives: To clarify: Program files get installed to C:\ Program shortcuts are always pointed to Z:\, my 640GB HDD Modifying the relevant environment variables doesn't do anything, I looked at this, but however it only talks about modifying the registry and environment variables, which I have already done so. I install to the Z:\ drive if the installation program lets me change the installation path, but however the installation programs sometimes don't let me change this. Is there a way that I can force every program to install to the relevant location on Z:\? Perhaps I'm missing something here? Edit: Found this program; would it be appropriate to use in my case? I would be able to move the entire Program Files (and its x86 version) to Z:\, without impacting on the performance.

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• Using rsync to migrate files between windows servers: problems with Excel spreadsheets

  - by HorusKol

  We've been migrating about 220 GB of data from a Windows 2003 Server to a Windows 2008 Server, and because of the time it would take to copy that data and the necessity of keeping it available for users, I came up with the idea of using rsync on an Ubuntu server to broker the migration. (I might have gone for a proper Windows solution - but the applications I found were a bit pricey for a one-shot like this - and permissions are not a problem). All well and good - and today I'm making the last sync and confirming that the new server is up-to-date using diff, but I"ve noticed an odd thing with Excel spreadsheets (.xls). Every instance of an Excel spreadsheet that has already been copied in a previous in a previous synchronisation is being marked as "already up-to-date" by rsync. However, when I then run a diff, I'm told that the files differ. I'm manually copying them, as there are but a handful, but I was wondering what might be causing this. No other filetype in the entire 220 GB tree has had any problem like this - just the Excel/xls files. It'd be great if someone could come up with an explanation.

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• Browsers behaving very strangely/not working in Windows Vista SP 2

  - by Kim_guest

  Sorry, that I'm posting this as a guest, but I couldn't log in. Maybe you can help me. I had a virus and gave this inspiron 1525 laptop to a computer expert, who removed it. I think he reinstalled Windows, because when I got it back IE 7 was installed. So after 3 hours I installed SP 1, SP 2, IE 9 and Google Chrome. First when there was only SP 1 and IE 7 installed, I could only use Google in IE, and I had copy the links download links of the updates (Update center didn't work) over to Google Chrome to download it there, because I couldn't do that in IE. Now I can't use Google at all, but strangely Bing works. Also I can display certain pages, but not all (I could open StackExchange, but not the login page; that's why I'm posting this as a guest). Another strange thing is, that now a webpage either works in both browsers (I couldn't install Opera, because the installer says it can't download the files) or in none. It is a 32 Bit system. It would be nice if you could help! I hope I will be even able to post this question...

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• Are there any tests I can run on a network to simulate 100 heavy network users?

  - by marc.gayle

  I will be hosting a Ruby on Rails workshop at a small hotel in the near future, and while they have 'Wifi' everywhere on the property, and the property normally hosts 150 - 300 people, I am not 100% confident that they have hosted 150 tech people that tend to have heavy web surfing habits/needs. Their tech department is also 1 or 2 guys. Are there any automated tests I can download and run from my laptop, on the network, that would simulate 100 'heavy users' on the network at the same time? Their broadband pipe is a 15mbps cable connection. Would that suffice for the general surfing needs of 100 - 150 techies? I know all it takes is 1 or 2 bit torrenters to kill the entire network, but assuming we can at the very least block those ports or encourage the attendees not to file share on the network, would that speed suffice for general surfing needs? What are good resources online that would allow me to quickly get up to speed on the IT related issues, so that I can ask their sysadmins the right questions? Edit: Note that I am fairly technical, so assume I can get up to speed quickly even with technical manuals, etc.

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• Computer crashes if left unattended AND running uTorrent, what could be?

  - by DiegoDD

  I have a weird problem in which, if I leave my computer unattended, AND I leave uTorrent open, downloading/seeding, the computer simply crashes after about 20 / 30 minutes (don't know exactly since if I leave it, and come back later, it has already restarted or has a BSOD.) If I leave the computer alone for undefined time WITHOUT uTorrent, nothing happens, and if I am constantly using the computer while using uTorrent, no problem either (I could be using it all day with uT open and it doesn't crash). So what could it be that the combination of those cases makes the computer crash? I have already checked the power management so the computer never enters stand by mode, sleep, hibernate, etc. (the only thing I do is turn off the display). A first guess is that maybe one of my external hard drives DO sleep or enters in a "low power" mode or something if I don't use the PC. but since uT is running MAYBE tries to use that drive, and makes it crash. Could that be possible? How to know for sure if the external drive does that, and to prevent it from doing so. Any more ideas of what may be causing that? Specs: Windows 7 Pro, 64-bit, 2 GB RAM. Latest version of uTorrent (although it has been happening for a while now). UPDATE: i just found out that uTorrent has Disk cache options ( preferences - advanced - disk cache ). I have no idea if that may be causing problems with my external drive, hence causing the crash.

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• Nginx proxy upstream cached?

  - by Julian H. Lam

  Attempting to resolve an issue that's been annoying me for a bit. I've distilled the symptoms into a set of reproducible steps: I have two sites, siteA, and siteB. They are both Node.js applications running on different ports (for the sake of example, 4567 and 4568) Both applications have their own file in sites_available (plus a symlink from sites_enabled), which contain the directives proxy_pass http://node_siteA/ and proxy_pass http://node_siteB/ respectively, inside of a location block. They also each have an upstream block (defined globally?): upstream node_siteA { upstream node_siteB { server 127.0.0.1:4567; server 127.0.0.1:4568; } } Site A and Site B have nothing to do with each other. Yes, I am restarting (reloading, actually) nginx every time I make a change. If I take down site B and attempt to access it via the web, I am served site A. Why is this? Thoughts Other times, when I create a new Site C, for example, nginx refuses to show me anything except "Welcome to nginx!" for ~5 minutes. This suggests a resolver timeout, perhaps? When I access Site B after its config has been deleted, and it sends me to Site A, this sounds like nginx sending me to servers in a round-robin fashion...

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• Explorer.exe hangup during move large file into external drive

  - by PiotrK

  During move large files (700mb+) to external drive formated NTFS via USB 3.0 I've noticed strange things about explorer.exe (I am using Windows 7 up to date) Sometimes after move file the explorer get stuck (ie. it can happen after few files during move of several large files) - moving window freeze and I am unable to kill explorer (via taskmgr, or cmdline TASKKILL). In command line I've got something like this (taskmgr shows that explorer.exe is still running - I've got the same PID every time I try to kill it and no diagnostic message): C:\Windows\system32TASKKILL /F /IM explorer.exe SUKCES: proces "explorer.exe" o identyfikatorze PID 6296 zostal zakonczony. C:\Windows\system32TASKKILL /F /IM explorer.exe SUKCES: proces "explorer.exe" o identyfikatorze PID 6296 zostal zakonczony. If I try to run another explorer.exe process at this point, I got desktop icon and start bar back but I cannot open any explorer window After few minutes explorer.exe finally dies and I am able to rerun it without rebooting File that I moved have two copies - one local and one on the external drive (the original file wasn't delete after move); Both copies seems to contain the same data (same length and CRC info) If this happen during move of multiply files, only some files are moved and one of them have two copies (both locally and on the external drive) What can I do to fix those explorer hangs? Added: The same problem exist when copying files, it hangsup between large files Similar problem exist when I tried to use TotalCommander (x64): copying paused at 80% of one of files, TC didn't hung up (but clicking cancel in copying dialog box doesn't have any effect). During this pause I can't kill TotalCmd.exe just like Explorer.exe Added (2): This problem seems to disappear when I use 32 bit applications (like TotalCommander (x86) ), but I need to do more testing to be sure of this Added (3): There are several errors in event log, source: disk, id: 11, qualifiers: 49156, task: 0, level: 2, keywords: 0x80000000000000 (This may be important, and I forgot to mention this): Main disk is encrypted via Truecrypt (boot-in password)

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• OpenVPN bridge network from routed clients

  - by gphilip

  I have the following setup: subnet 1 - 10.0.1.0/24 with a machine used as NAT and also running an OpenVPN client subnet 2 - 192.168.1/24 with an OpenVPN server (the server in subnet 1 connect here) subnet 3 - 10.0.2.0/24 that uses the NAT machine (subnet 1) to access the internet, so all non-local traffic is routed there to the eth0 interface The OpenVPN client creates the tun0 interface and appropriate routing so that I can access machines from 192.168.1/24 [root@ip-10-0-1-208 ~]# telnet 192.168.1.186 8081 Trying 192.168.1.186... Connected to 192.168.1.186. Escape character is '^]'. [root@ip-10-0-1-208 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.0.1.1 0.0.0.0 UG 0 0 0 eth0 10.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.8.0.1 10.8.0.5 255.255.255.255 UGH 0 0 0 tun0 10.8.0.5 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 169.254.169.254 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 192.168.0.0 10.8.0.5 255.255.0.0 UG 0 0 0 tun0 However, when I try the same from subnet 3, it can't reach that machine. [root@ip-10-0-2-61 ~]# telnet 192.168.1.186 8081 Trying 192.168.1.186... I suspect that it's because subnet 3 is routed to eth0 on the NAT machine in subnet 1 and it cannot jump to tun0. What's the easiest way to resolve it? I don't want to use iptables. I can't change the routing from machines in subnet 1 because it's done in AWS and so it works only with specific interfaces. Also, the NAT machine gets its IP with DHCP and so bridging is a bit complicated. IP forwarding is set on the NAT machine [root@ip-10-0-1-208 ~]# cat /proc/sys/net/ipv4/ip_forward 1 Thank you!

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• Virtualizing an Inline network appliance with VirtualBox (or VMWare)

  - by Tzury Bar Yochay

  My device, which is a Linux based IP in-liner is transparent to the network peripherals, that is, no IP address assigned to any of its interfaces. For the sake of the conversation, let's use ADSL connection as an example, while the device is inspecting the bi-directional traffic, the network is behaving same as if device was not there, attached to the wire (see Physical setup at the attached diagram). I wonder if I can enclosed that "device" within a Windows machine and have it operated virtually so it still seats inline between the ADSL router and the Windows netwroking interface by using virtual NICs, (or whatever their name is in windows), and inspecting the traffic, same as if it was on a separate physical device, the drawing under "Virtual Setup" in the attached diagram show what I am trying to achieve. Reading a bit on the VirtualBox docs, seems like binding the right side is relatively simple, perhaps I should have one network adapter set as Bridge Networking and VirtualBox will connect it to the physical NIC on the host machine, and network packets are exchanged directly, circumventing the host operating system's network stack (WinXP in my case). However, I have no idea how to achieve the left side of my diagram, which requires adding virtual NICs to windows and configure them correctly in a way to make that pipeline possible. I would appreciate any help. by the way, if that is not possible with VirtualBox but with other virtualization solution (e.g. VMWare), I would accept the other as well.

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• dom0 enable IPv6 for guests

  - by user98651

  I am looking at deploying IPv6 to my virtual machines. Right now I have v6 working great on the dom0 using a 6in4 provided by Hurricane Electric as I do not have native v6. However, I would like to distribute some of the /48 I am receiving to the domUs (/64 per machine would be ideal, but I am open to your suggestions). Static configuration on the domU side is fine. All I want to accomplish is getting the traffic to pass through the dom0 to the domU. To say the least, I'm still trying to wrap my head around all the virtual interfaces and bridges Xen creates. Yes, I have Googled around for this a bit and have not found anything great. I tried using two "vif-route6" bash scripts with no luck (possibly due to my ignorance with Xen networking). I am still stuck (mainly in how to configure the dom0). I would like to imagine this problem is relatively easy to solve and I look forward to your suggestions and help! Edited post to clarify my end goal: getting IPv6 to domU guests. I am completely open to suggestions but am hoping for something other than setting up a tunnel for every guest.

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• Finding Bluetooth link key in Windows 7, to double pair a device on dualboot computer

  - by Ilari Kajaste

  How can I dig up the Bluetooth link key for a paired device in Windows 7? Is this something that is dependent on the Bluetooth stack I'm using (Toshiba), or is there a generic place to store these in Windows 7? Note: I'm not talking about the six-digit code usually typed by the user during pairing - that is worthless since it's discarded after pairing process. What I mean is the 128-bit link key that the devices exchange during pairing, and use thereafter to encrypt all their Bluetooth traffic. Background: I dualboot Windows 7 / Ubuntu on my laptop, and I would like to have my phone paired to both OS's. Since the dualbooting computer has only one Bluetooth adapter and thus only one Bluetooth address, I cannot do two pairings to the phone, since on the second pairing (Windows) the phone just replaces the previous pairing (Linux) to the same Bluetooth address. A thread on Ubuntu forums pointed me to what I have to do - pair first on Linux, then on Windows, and then replace the link key on Linux side with the one Windows negotiated. I can find the Linux side pairing key from /var/lib/Bluetooth/[BD_ADDR]/linkkeys - no problems there. However, on Windows side I can't find the key. According to the forum post, on Windows side the key should be in SYSTEM\ControlSet002\services\BTHPORT\Parameters\Keys\[BD_ADDR] but while that registry key does exist, it has no subkeys. (And a similar registry path in ControlSet001 didn't have any subkeys either.) One thing I've been instructed to do is to capture all events during pairing with Sysinternals Process Monitor. I did this, but I haven't been able to find any useful information from the captured events, not even by exporting the data to a huge XML and grepping that with the BD_ADDRs (with or without colons). So how could I find the link key for a paired device in Windows 7? Some reference information: Wikipedia: Bluetooth, Security Now: Bluetooth security

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• Connecting to unsecured wireless network

  - by Sanchez

  I would like to know what information is public and can be intercepted in a non-open, but unsecured wireless network. Moreover, is there anything I can do to make it more "secure", other than using https connection whenever possible. In more details, I recently discovered (with surprise) that the wireless network in my school is actually unsecured. Although not everyone can connect to it (you need a student ID), I am told that certain softwares like Wireshark would be able to intercept the data. Since I have been using the network for all private purposes (email, facebook etc), I do feel quite insecure now and would like to understand the situation a bit better. I installed Wireshark and tried to play with it but all I can see are something alien to me. In any case, all I see seems to come directly/indirectly from my IP address, and I have long thought that usually different computers in the same wireless network would be assigned different addresses. Am I wrong? If not, then I feel very confused about what information is actually being captured (potentially by other users in the network, since I don't think I could capture activities of others in the same network anyway), and whether it's safe to use the network at all. (Gambling on others in the same network showing good behaviour is apparently not an option.) Thank you.

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