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• TCP dies on a Linux laptop

  - by Roman Cheplyaka

  Once in several days I have the following problem. My laptop (Debian GNU/Linux testing) suddenly becomes unable to work with TCP connections to the internet. The following things continue to work fine: UDP (DNS), ICMP (ping) — I get instant response TCP connections to other machines in the local network (e.g. I can ssh to a neighbour laptop) everything is ok for other machines in my LAN But when I try TCP connections from my laptop, they time out (no response to SYN packets). Here's a typical curl output: % curl -v google.com * About to connect() to google.com port 80 (#0) * Trying 173.194.39.105... * Connection timed out * Trying 173.194.39.110... * Connection timed out * Trying 173.194.39.97... * Connection timed out * Trying 173.194.39.102... * Timeout * Trying 173.194.39.98... * Timeout * Trying 173.194.39.96... * Timeout * Trying 173.194.39.103... * Timeout * Trying 173.194.39.99... * Timeout * Trying 173.194.39.101... * Timeout * Trying 173.194.39.104... * Timeout * Trying 173.194.39.100... * Timeout * Trying 2a00:1450:400d:803::1009... * Failed to connect to 2a00:1450:400d:803::1009: Network is unreachable * Success * couldn't connect to host * Closing connection #0 curl: (7) Failed to connect to 2a00:1450:400d:803::1009: Network is unreachable Restarting the connection and/or reloading the network card kernel module doesn't help. The only thing that helps is reboot. Clearly something is wrong with my system (everything else works fine), but I have no idea what exactly. I don't know how to reproduce this, but as I said, it happens every several days. My setup is a wireless router that is connected to the ISP via PPPoE. Any advice?

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• Computer always freezing after random periods of time. No errors listed.

  - by Wesley

  Hi, all. Here are my specs beforehand: AMD Athlon XP 2400+ @ 2.00 GHz, 160GB IDE HDD, 128MB GeForce 6200 AGP, 2 x 512MB PC3200 DDR RAM, CoolMax 350W PSU, 1 x CD-RW Drive, 1 x DVD-ROM Drive, FIC AM37 Mobo, Windows XP Pro SP3 My desktop freezes after random periods of time but there are no errors listed in the Event Viewer after a forced shutdown and restart. A couple months ago, I found that when it froze, the floppy was being accessed at the same time. So, I disconnected the floppy (since I never used it anyways) from the power supply and motherboard. Everything was working fine and the computer never froze. This past Christmas break, I left for a Conference and when I got home, the computer kept freezing again. So, this time, I just disconnected the DVD reader (from mobo and power) and started it up. Still, it froze almost right away. Then I found some older sticks of RAM (2 x 256MB PC2100 DDR) and swapped them in. Everything worked fine again after that. I even swapped the 2 x 512MB PC3200 DDR RAM back in and everything worked okay. Then it started freezing again, and I tried all possible RAM combos, still freezing within 5-10 minutes of startup. One thing I've realized is that the floppy drive is still listed in My Computer and I uninstalled it from my Device Manager already. There were no software errors, and I uninstalled the most recent software, with no effect. Still, I have no idea what is wrong because everything ran fine before that. Any suggestions? EDIT: Still have yet to buy some blank CD media to use Memtest86+. However, would a lack of virtual memory cause the computer to freeze? EDIT2: So after a long time, I ran Memtest86+ and all is well. Turns out though, after removing my original DVD reader and replacing it with a DVD-ROM drive, there is no freezing whatsoever! Thanks for all your suggestions!

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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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• How does Safari's Reader work and when does it show up?

  - by TestSubject528491

  Safari's Reader feature is a cool little app that displays a web page as a newspaper article --- without all the distracting sidebars, comments, and ads. Sometimes it works and sometimes it doesn't, and I'm wondering how "it knows when to show up." On my personal website, one of the pages has this option. You can click the Reader button in the URL bar and it is displayed beautifully like a page in an iBook. However, none of my other web pages (on the same site) do this. I thought it had something to do with the <article> tag, but I removed that and it still works. Anyone know how this app works? Also, does anyone know of any Chrome extensions that are just like this? Google Reader is not the same thing. PS: From the cited Apple website: Safari Reader As you browse the web, Safari detects if you are on a web page with an article. Click the Reader button that appears in the Smart Address Field and an elegant view of the article appears — without any distracting content. Not much help, is it?

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• Find slow network nodes between two data centers

  - by 2called-chaos

  I've got a problem with syncing big amount of data between two data centers. Both machines have got a gigabit connection and are not fully occupied but the fastest that I am able to get is something between 6 and 10 Mbit = not acceptable! Yesterday I made some traceroute which indicates huge load on a LEVEL3 router but the problem exists for weeks now and the high response time is gone (20ms instead of 300ms). How can I trace this to find the actual slow node? Thought about a traceroute with bigger packages but will this work? In addition this problem might not be related to one of our servers as there are much higher transmission rates to other servers or clients. Actually office = server is faster than server <= server! Any idea is appreciated ;) Update We actually use rsync over ssh to copy the files. As encryption tends to have more bottlenecks I tried a HTTP request but unfortunately it is just as slow. We have a SLA with one of the data centers. They said they already tried to change the routing because they say this is related to a cheap network where the traffic gets routed through. It is true that it will route through a "cheapnet" but only the other way around. Our direction goes through LEVEL3 and the other way goes through lambdanet (which they said is not a good network). If I got it right (I'm a network intermediate) they simulated a longer path to force routing through LEVEL3 and they announce LEVEL3 in the AS path. I basically want to know if they're right or they're just trying to abdicate their responsibility. The thing is that the problem exists in both directions (while different routes), so I think it is in the responsibility of our hoster. And honestly, I don't believe that there is a DC2DC connection which only can handle 600kb/s - 1,5 MB/s for weeks! The question is how to detect WHERE this bottleneck is

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• How to record tv to network share with Windows Media Center?

  - by Peterdk

  Well, you would think that Windows 7's new MediaCenter would be up to the task of recording your TV to a network share/drive. Too bad, it looks like it's just not possible. I have a windows 2008 R2 server, and a Windows 7 machine with a TV card. Since my server has 2TB of storage, it would be nice to record directly to it's networked drive. (I mounted it as Z:). I tried the following: Selecting it in Media Center Itself: Not working. Not available. Editing the registry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Media Center\Service\Recording , setting RecordPath to Z:\TV. Not working. Editing the registry: setting RecordPath to \\server\TV. Not working. Creating a Symlink (mklink \D) to Z:\TV and \\server\TV and setting that in the registry as RecordPath. Currently I am out of options. I could ofcourse Install Windows7 on my server, but I have no license for that, and my windows 2008 r2 is free from dreamspark. Are there people that are succesfully recording to a networked drive/storage? edit I also need to mention that I need to be able to acces the stored files from other PC's, like my laptop. So iSCSI is great for recording, but it looks like you can't access iSCSI devices from multiple PC's. Looks like sharing a iSCSI device is out of the question, so: Are there workarounds to get this thing recording to my network drive?

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• Windows Media Center showing Jerky Video on PC

  - by Kris Erickson

  I had to repave my Windows 7 x64 box last week due to a hard drive crash, and for a while everything was running perfectly but now all videos in Windows Media Center are jerky (the sound is fine, they just seem to skip a ton of frames all the time). This is on the local machine, but the same thing happens when I try to stream to my Xbox. The videos all show fine in VLC and Windows Media Player (however exhibit the same problem in Quicktime). I guess I must have installed something recently (in the process of getting all the apps I usually have running on my PC) that caused this but for the life of me I can't figure it out. I have updated to the latest video driver (and then rolled back to the standard Windows 7 driver), I have rolled back all the other drivers that I have installed (I believe). I have uninstalled all the codec packs (I also run TVersity, so I have the TVersity codec pack installed), and I uninstalled TVersity. Nothing seems to help. I have uninstalled windows media center, and reinstalled it from the Programs and Features. I have basically ran out of things to try to fix this, and am almost thinking about reinstalling Windows again. Any suggestions? Edit Specs on the PC (which I figured was unimportant since everything used to work perfectly): Intel Core 2 CPU 6600 @ 2.4 Ghz Nvidia GTS 8800 Built in realtek-audio soundcard 4GB Ram Codecs which are failing: All that I have tried, but at least Xvid, Mpgv (mpeg2 video from a camera), and Wmv (only kinds that I have ready access to).

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• Certificate revocation check fails for non-domain guest in spite of accessible CRL

  - by 0xFE

  When we try to use certificates on computers that are not part of the domain, Windows complains that The revocation function was unable to check revocation because the revocation server was offline. However, if I manually open the certificate and check the CRL Distribution Point property, I see an ldap:/// URL and an http:// URL that points to externally-accessible IIS site that hosts the CRLs. Of course, the non-domain-joined client cannot access the ldap:/// URL, but it can download the CRL from the http:// link (at least in a browser). I enabled CAPI logging and I see the event that corresponds to this failed revocation check. The RevocationInfo section is: RevocationInfo [ freshnessTime] PT11H27M4S RevocationResult The revocation function was unable to check revocation because the revocation server was offline. [ value] 80092013 CertificateRevocationList [ location] UrlCache [ url] http://the correct URL [fileRef] 6E463C2583E17C63EF9EAC4EFBF2AEAFA04794EB.crl [issuerName] the name of the CA Furthermore, I can see the HTTP request to the correct URL and the server's response (HTTP 304 Not Modified) with Microsoft Network Monitor. I ran certutil -verify -urlfetch, and it seems to show the same thing: the computer recognizes both URLs, tries both, and even though the http:// link succeeds, returns the same error. Is there a way to have non-domain-joined clients skip the ldap:/// link and only check the http:// one? Edit: The ldap:/// URL is ldap:///CN=<name of CA>,CN=<name of server that is running the CA>,CN=CDP,CN=Public Key Services,CN=Services,CN=Configuration,DC=<domain name>?certificateRevocationList?base?objectClass=cRLDistributionPoint The non-domain-joined clients may be on the domain network or on an external network. The http:// CDP is accessible from the public internet.

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• Quicktime won't install on Windows 7 Ultimate 64bit

  - by Martin

  Hi! I am trying to install quicktime (actually just need iTunes..but then iTunes needs qt), but it fails. There seems to be a problem with the folder C:\Program Files(x86)\QuickTime\ - Quick Time wants to write the file QTTask.exe, but complains that it does not have permission to do so. Same thing happens with \PropertyPanels\PanelHelperBase.qpa I have tried deleting all Apple programs (in the order suggested in the support forum) and also tried to delete the temp folder. That did not work. I have tried to manually adjust the permissions of the QuickTime folder - no effect. I have run the installation file with admin rights and with different compatibility modes to no effect. I consider myself to be an experienced user - able to solve most problems - but now I am stuck. I need some input / fresh ideas on how to tackle the problem. This is very annoying as I cannot sync iPhone/iPad/iPod while iTunes is not running - due to the stupid (sorry) idea of only have your device linked to one library. Please help. Thanks!

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• What kind of server attacks should i be aware of nowadays

  - by Saif Bechan

  I am recently running a web server, and there is a lot of information online, but it can all be a little confusing. I recently opened my logwatch logs and saw that i get attacked a lot by all sorts of bots. Now I am interested in a list with things I definitely should be aware of nowadays, and possible ways to prevent them. I have read stories about server crashed by floods, crashed by email, and all sorts of crazy stuff. Thing I already did: I have recently blocked all my ports, except for the http and email ports. I disabled IPv6, this was giving me a lot of named errors I have turned on spam DNS blackhole lists to fight spam - sbl.spamhaus.org; - zen.spamhaus.org; - b.barracudacentral.org; I installed and configured mod_security2 on apache There is no remote access possible to my databases That is all i did so far, further I am not aware of any other threats. I want to know if the following things have to be protects. Can I be flooded by emails. How can i prevent this Can there be a break in or flood of my databses Are there things like http floods or whatever Are there any other things i should know before i go public with my server I also want to know if there is some kind of checklist with must-have security protections. I know the OWASP list for writing good web applications, is there something for configuring a server.

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• Messed up partitions... system will not boot!

  - by someguy

  I did a really dumb thing. cfdisk threw an error at me saying "FATAL ERROR: Bad primary partition 3: Partition ends in the final partial cylinder", so I installed Partition Table Doctor to see if I could fix the problem. When the program started up, it told me there were problems with my partitions, and asked if I wanted them fixed (cannot remember real message, but I believe it had something to do with the cylinder boundaries), so, blindly, without thinking of the consequences, I did. Now, my system will not boot. I tried booting from the Windows 7 installation CD. I went to install a fresh copy, but it said that "No drives were found". I then opened up diskpart. According to diskpart, there is only one partition, containing one volume, assigned the letter "C". Before, I had four partitions! It is also saying that the file system is RAW. Is there any way I can fix this? I have important data that I do not want to lose. Later on... I tried fdisk with the option -l, which lists the partition table(s), and this is what I got: Ignoring extra extended partition 4 Disk /dev/sda: 250.1 GB, 250059350016 bytes 255 heads, 64 sectors/track, 30401 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x163df116 Device Boot Start End Blocks Id System /dev/sda1 6 18 102400 7 HPFS/NTFS Partition 1 does not end on cylinder boundary. /dev/sda2 18 7851 62918572+ 7 HPFS/NTFS /dev/sda3 13073 30402 139196416 f W95 Ext'd (LBA) /dev/sda3 13073 30402 139196416 f W95 Ext'd (LBA) /dev/sda3 13073 30403 139203193 7 HPFS/NTFS I don't know if this will help, but it's extra information, at least. Also, this is how I had my partitions: 40MB (Unallocated) 100MB (System Reserved) 60GB (Windows, C:) 40GB (Was reserved for secondary OS) ~132GB (Home, E:)

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• Linux CentOS strange memory readings

  - by user2008937

  I am actually a young junior sys admin. I have a question - i am trying to understand how linux deals with memory... while playing around different monitoring programs I found some strange thing. When I run top on my laptop it shows me that FIREFOX process with pid 8778 takes 18,3% of memory (%MEM column). grep "MemTotal" /proc/meminfo Above command give me 1848336kb/1024 = 1805megs of memory (its ok - i have 2 gigs of ram). So if the firefox process takes 18,3% of MEM(according to tops %MEM column) then it takes 0.183 * 1805 which is approximately 325mb of memory. Quite a lot as for firefox... But well, in Linux there are lots of shared libraries that programs commonly uses (like famous libc). And those libraries are added to memory utilization of every process that uses it in the system, despite they are actually reading same file(single object in memory). So top may show too big mem utilization because of those shared libraries. Well, it is time to use PMAP which should show us the real mem utilization of process. But.. pmap -d $(pidof firefox) mapped: 983460K writeable/private: 757164K shared: 66416K so pmap shows that 983460/1024=993MB of memory is mapped to this process. It is in fact much bigger than mem utilization showed by top. Whats wrong here? How pmap can show more than top? even when top adds also the shared libraries (which in fact are single objects in memory) for each process that uses it? and pmap omits it? Regards Krzysztof

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• PC dies when running at 100% CPU

  - by user155631

  I recently wrote some Java code to generate images of the Mandelbrot set (fractal). I made use of the new Fork/Join facility in Java 7 to run separate threads on all four cores (2 real, 2 virtual)simultaneously, using a large number of iterations for greater accuracy. The problem is, the process runs fine for about a minute, and then it's as if someone has pulled the plug and the PC just dies. I thought it must be the CPUs overheating, so I ran Real Temp to monitor the temperature. It's an Intel i3 processor. I can see the temperature creeping up to 70 degrees, and then it seems to level off there and run for about another 30 seconds before dying. According to Real Temp, there's still a gap of 35 degrees between the actual temperature and TJ max. I also tried disabling "CPU TM function" in the BIOS, but the problem still occurs. A colleague suggested that it might be a power supply problem, so I borrowed a more powerful PSU (can't remember what wattage it was, but it's higher than mine which is 500W). The exact same thing still happens though. Is anyone able to suggest what the problem might be, or what I can try next?

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• Write permissions on uploaded files - Linux, Apache, PHP

  - by letseatfood

  I am working on a PHP script that transfers files using FTP functions. It has always worked on my production server (which is a hosting service). The development server I have just setup (I am a novice to servers) is Debian Lenny with Apache2, PHP5, and MySQL5. The file transfer works correctly, but once the file has been written to the server, it has permissions of 600. This makes it impossible for me to view the file (JPEG) in the web browser, as permission is denied. I have scoured the internet and even broken my server installation and reinstalled it trying to figure this out (which has been fun, nonetheless!). I know it is unwise to set 777 permissions on public accessible files, but even that will not solve the problem. The only thing that works is if I chmod 777 thefile.jpg after it has been transferred, which is not a working solution. I tried changing the owner of my site files to www-data per this post, but that also does not work. My user is mike, and it still does not work whether the owner of the files is mike or root. Would somebody point me in the right direction? Thanks! And, of course, let me know if I can clarify anything.

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• NTBackup (on WS2k3) fails to backup remote server (WS2k8R2) with " Error: is not a valid drive, or you do not have access."

  - by Mark A

  We run an NTBackup job on a Windows Server 2003 R2 SP2 with all updates (as of Q4-2011). It works well backing up two WS2k3 servers as well as the backup server itself. However, we have been unable to successfully back up our Windows Server 2008 R2 machine ("G5-01"). It often runs for about 2GB worth of backup and then dies out with one of the below error messages. It should be more like 20GB for the full server. We have tried using the admin share (C$), an explicitly shared drive share, UNC and mapped drives. The result is the same each time, the only thing that varies is the amount of stuff backed up before it chokes. We've also run NTBbackup from the UI interface, from the command line and as a scheduled task. We are backing up to 400/800GB tapes and they have plenty of space available on them (blank media). Error: \\G5-01\c is not a valid drive, or you do not have access. Error: \\G5-01\c$ is not a valid drive, or you do not have access. Error: Y: is not a valid drive, or you do not have access. Error: Could not access or create backup catalog files. Verify that you have full access to the working folder and there is disk space available. The job is run as Administrator and we have no problems logging onto the server and transferring files. The Event Log on the WS2k8 is not much help, as it has success audits for each login. All of the hardware involved (HP DL360 G3, HP LTO Ultrium 3, Adaptec 39320A) has the latest supported drivers. We've seemingly tried a bunch of different options but are wondering where to look next to resolve the backup issue. We've been super happy with our reliable schedule task for years but this one is stumping us!

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• Effects of internet connection speeds on server queries

  - by SephMerah

  Can my internet connection significantly effect queries run on phpmyadmin? I am currently 18 down and 30 up. I switched internet connections today and noticed a deep drop in query performance. The query that I am running is SELECT * FROM table. Simple. The table has one row of data. The MySQL server is on the same server as everything else. It is a VPS. Godaddy hosts. I dont have any other information. Centos 6.3 MySQL 5.1 PhpMyAdmin 3.4 Okay used google tools to inspect the XHR going out and coming in and this is what it reported. {"success":true,"message":"<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec )<\/div>","sql_query":"<div id=\"result_query\" align=\"\">\n<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec ) SNIP..................."}. So apparently my server is fine. The strange thing is though.. The returned XHR comes back exactly as soon as I execute the query on the page. It comes back within less than a second. Why PhpMyadmin does not report the change immediately. I am going to try a re-install.

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• Internet Explorer ignoring PHP setcookie() from CentOS server

  - by Hussein Sabbagh

  In the past we used a windows XAMPP server for an internal website. It worked fine but had some intermittent issues and we decided to move to a LAMP server on CentOS. We made the switch today but it turns out Internet Explorer ignores every attempt I make at saving a cookie. There is no underscore in the URL being used... the URL is actually the same as the one the XAMPP server used, where I was able to save cookies without any problems. It really doesn't make any sense to me, all of the code is the same. The only thing to change is the version of PHP and the server OS. The website works on all other browsers except IE. I can't even make a simple setcookie call. On a blank test page I use setcookie("test", "test", time()+36000, "/"); sleep(5); print_r($_COOKIE); and there is nothing there. Our users can't log into the website because of this and I have no idea what the issue is. If anyone can provide any clues or resolutions I would greatly appreciate it. Obviously the easy answer is to not use IE, but that is not an option in this case.

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• Hyper-V: Dedicated NIC for Guests VMs

  - by TheLizardKing

  I have two NIC cards and created a private virtual network for my virtual machines and unchecked "Allow management operating system to share this network adapter" which basically turns my Guest NIC into this sorta shell of a NIC card on the host machine and the only thing checked in it's properties is "Microsoft Virtual Network Switch Protocol" which I am fine with. Everything works and everything is connected. My issue is that for some reason my guest (Ubuntu Server with legacy network drivers) is not talking properly to my DHCP server. Specifically my DHCP server reserves the guest's IP address using it's MAC address but the guest isn't picking it up. It's picking up any old IP it can get and I can't even ping the hostname from another PC on the network but it pings fine if I use the IP. I see the guest showing up in my DHCP table but I can't get the reservation to stick. Is there some reason it's only partially communicating with my DHCP server? Pinging it's hostname on itself reveals it's using 127.0.0.1 instead of it's network IP. Is this an issue with the legacy drivers used in Hyper-V?

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• How do you set max execution time of PHP's CLI component?

  - by cwd

  How do you set max execution time of PHP's CLI component? I have a CLI script that has gone into a infinite loop and I'm not sure how to kill it without restarting. I used quicksilver to launch it, so I can't press control+c at the command line. I tried running ps -A (show all processes) but php is not showing up in that list, so perhaps it has timed out on it's own - but how do you manually set the time limit? I tried to find information about where I should set the max_execution_time setting, I'm used to setting this for the version of PHP that runs with apache, but I have no idea where to set it for the version of PHP that lives in /usr/bin. I did see the follow quote, which does seem to be accurate (see screenshot below), but having an unlimited execution time doesn't seem like a good idea. Keep in mind that for CLI SAPI max_execution_time is hardcoded to 0. So it seems to be changed by ini_set or set_time_limit but it isn't, actually. The only references I've found to this strange decision are deep in bugtracker (http://bugs.php.net/37306) and in php.ini (comments for 'max_execution_time' directive). (via http://php.net/manual/en/function.set-time-limit.php) ini_set('max_execution_time') has no effect. I also tried the same thing and go the same result with set_time_limit(7).

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• How can I make grub2 boot into Windows 7?

  - by Grzenio

  I had Windows 7 installed on my system, then I installed Debian testing with grub2 as its boot manager. Initially I couldn't see windows entry in grub at all, so I ran: aptitude install os-prober kcpuload update-grub Now I can see the entry, but when I select it I get only Win7 system restore, instead of the the real thing. Any ides how to make it work? EDIT: I tried the suggested approach to add a new file to /etc/grub.d, which generated an entry in grub.cfg, but it does not appear in the grub menu on boot :( I have this: grzes:/home/ga# cat /etc/grub.d/11_Windows #! /bin/sh -e echo Adding Windows >&2 cat << EOF menuentry “Windows 7? { set root=(hd0,2) chainloader +1 } And I have the following grub.cfg file: grzes:/home/ga# cat /boot/grub/grub.cfg # # DO NOT EDIT THIS FILE # # It is automatically generated by /usr/sbin/grub-mkconfig using templates # from /etc/grub.d and settings from /etc/default/grub # ### BEGIN /etc/grub.d/00_header ### if [ -s $prefix/grubenv ]; then load_env fi set default="0" if [ ${prev_saved_entry} ]; then set saved_entry=${prev_saved_entry} save_env saved_entry set prev_saved_entry= save_env prev_saved_entry set boot_once=true fi function savedefault { if [ -z ${boot_once} ]; then saved_entry=${chosen} save_env saved_entry fi } insmod ext2 set root=(hd0,3) search --no-floppy --fs-uuid --set 6ce3ff31-0ef7-41df-a6f5-b6b886db3a94 if loadfont /usr/share/grub/unicode.pf2 ; then set gfxmode=640x480 insmod gfxterm insmod vbe if terminal_output gfxterm ; then true ; else # For backward compatibility with versions of terminal.mod that don't # understand terminal_output terminal gfxterm fi fi set locale_dir=/boot/grub/locale set lang=en insmod gettext set timeout=5 ### END /etc/grub.d/00_header ###

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• Advice on Computer Specs for overall development/general use machine

  - by Ender

  At the moment I am restricted to a laptop with 512MB of RAM, a 120GB HDD and a 1.5GHz Intel processor for all my development and general browsing needs, and as you can probably tell using it for anything modern is a painful experience. As a result I've decided to buy myself a new desktop computer, one that will stand the test of time and one that can be upgraded easily. Rather than build the machine myself I've decided to go through Dell as I've had good experiences with them when purchasing computers for my family. I've had my eye on this as it's got a good amount of RAM, has a decent-rated processor and isn't priced too badly. http://www1.euro.dell.com/uk/en/home/Desktops/inspiron-580/pd.aspx?refid=inspiron-580&s=dhs&cs=ukepp1&~oid=uk~en~20211~inspiron-580_d005827~~ Intel® Core™ i5 Processor 750 (2.66GHz, 8MB) Genuine Windows® 7 Home Premium 64bit - English Display Not Included ATI Radeon™ HD 5450 1GB DDR3 graphics 6144MB Dual Channel DDR3 [3x2048] Memory 1TB (7200rpm) SATA Hard Drive DVD +/- RW Drive (read/write CD & DVD) with DVD Burn software 1 year of coverage included with your PC McAfee® Security Centre - 15 Month Protection - English After the pain of using a slow laptop for all this time the main thing I want is speed. I may look to play a couple of basic games on it, nothing too powerful. Obviously I'll be doing some development on it too so it'll have to be able to handle the latest IDE's and Database tools like SQL Server pretty quickly. Finally, should I ever need to improve it I'd like to be able to add more RAM and change some of the parts. I wouldn't have thought this would be a problem but a few people I've spoken to have said that the amount of RAM the motherboard can handle isn't that great. Is this true? How long can I expect to be using this computer before it's too slow? Thanks in advance for the help.

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• Exchange 2010 certificate errors

  - by Frederik Nielsen

  I have a problem with my newly setup Exchange environment for our hosted customers. First off, when configuring the outlook client, it gives a certificate warning although the certificate has been bought and setup. I am using a setup like this: autodiscover.CUSTOMERDOMAIN.TLD CNAME autodiscover.exchange.COMPANYDOMAIN.TLD (Companydomain is our company that hosts the exchange servers, customerdomain being the customers domain) Shouldn't that work? I know that Microsoft does something like that for Office365, but I really don't think they buy a certificate for every customer.. So I guess some redirection should be setup somehow - any guidance? Next thing: When we accept that error, and move on to actually starting Outlook, it states that the certificate is not valid for the RPC proxy server exchange.COMPANYDOMAIN.TLD - this domain is not right, as that domain is not included in the certificate. I would instead like this domain to be mail.exchange.COMPANYDOMAIN.TLD I tried to run this script setting both internal and external URL's to be the same, with no luck. Any guidance on this one? I am running Exchange 2010 SP2, with CAS, HT and MBX split up on 3 different servers.

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• Did I miss anything when checking for passwords? [migrated]

  - by Keltari

  There's a bit of a story to this, so bear with me... I am looking for a new job and came across a posting for a computer forensics position. Its not really my field, but I thought I would apply anyway, just for fun. To make a longer story shorter, they want you to uncover as many passwords as you can find. I downloaded an image and dd'd it to a thumbdrive. The only thing visible was a text file, which contained a password. I knew there had to be more, so I used an undelete utility and found 2 deleted files. First there was another text file with a password - easy. The other was a .pst file which I mounted into outlook. There were some emails with passwords, as well as an email with an image. Another email has a link to a stegenography site. Obviously, there was a file hidden in the image, so I went to the website and downloaded the stegenography decoder. I had to try some of the passwords I had found to get the file to decrypt, and sure enough, there was another text file with a password. I called it a day at that point. Did I miss any other methods?

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• dnsmasq Client TTL

  - by user548971

  I have a situation where my hosts file is constantly changing. Because of this I don't want clients to cache ip addresses resolved using the hosts file. Here is the command that starts dnsmasq for me: /usr/sbin/dnsmasq -K -R -y -Z -b -E -S 8.8.8.8 -l /tmp/dhcp.leases -r /tmp/resolv.conf.auto --stop-dns-rebind --rebind-localhost-ok --dhcp-range=lan,192.168.2.2,192.168.2.249,255.255.255.0,12h -2 eth0 In looking at this site: http://www.thekelleys.org.uk/dnsmasq/docs/dnsmasq-man.html I see that the -T option has this description: -T, --local-ttl=<time> When replying with information from /etc/hosts or the DHCP leases file dnsmasq by default sets the time-to-live field to zero, meaning that the requester should not itself cache the information. This is the correct thing to do in almost all situations. This option allows a time-to-live (in seconds) to be given for these replies. This will reduce the load on the server at the expense of clients using stale data under some circumstances. My command doesn't have the -T option. Do I need it or does dnsmasq default TTL to zero without it?

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• Accidentally dd'ed an image to wrong drive / overwrote partition table + NTFS partition start

  - by Kento Locatelli

  I screwed up and set the wrong output for dd when trying to copy a freenas iso, overwriting the wrong external hard drive. Ironically, I was trying to setup a freenas server for data backup... External drive is only used for data storage, system is entirely intact Drive had a single NTFS partition filing the entire device (2TB WD elements) Drive originally had an MBR partition table. Drive now shows as having a GPT, presumably from the freenas image. Drive was mounted at the time, with maybe a couple kB of data written/read after running dd Drive is just a few months old and healthy (regular SMART / fs checks) I have not reboot the OS (crunchbang) /proc/partition still holds the correct information (and has been stored) Have dd's output (records in / out / bytes) testdrive did not find any partitions on quick or deep search running photorec to recover the more important data (a couple recent plaintext files that hadn't been backed up yet). Vast majority of disk content ( 80%) is unnecessary media files. My current plan is to let photorec do it's thing, then recreate the mbr with gparted and use cfdisk to create another NTFS partition using the sector information from /sys/block/.../. Is that a good course of action (that is, a chance of success)? Or anything else I should try first? Possibly relevant information: dd if=FreeNAS-8.0.4-RELEASE-p3-x86.iso of=/dev/sdc: 194568+0 records in 194568+0 records out 99618816 bytes (100 MB) copied grep . /sys/block/sdc/sdc*/{start,size}: /sys/block/sdc/sdc1/start:2048 /sys/block/sdc/sdc1/size:3907022848 cat /proc/partitions: major minor #blocks name ** Snipped ** 8 32 1953512448 sdc 8 33 1953511424 sdc1 current fdisk -l output: WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sdc: 2000.4 GB, 2000396746752 bytes 255 heads, 63 sectors/track, 243201 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Disk /dev/sdc doesn't contain a valid partition table

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