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• Can I get a domain controller not to act as DNS for the members?

  - by rsw

  Hi, Let me try to explain my current setup. I have one linux machine acting as DHCP and DNS (dhcpd3 and bind) in my network. This works fine, all computers I hook up to the network gets an IP address and proper DNS servers set. Let's call it 10.12.0.10 However, we also have a Windows Server 2003 Domain Controller in our network to which we add our Windows computers (running XP), let's call it 10.12.0.20. I noticed that when I run 'nslookup' on one of the windows machines, it says that the primary DNS is 10.12.0.20. This have not been much of a problem since: The Windows clients are stationary The Windows server in itself point out my real DHCP/DNS, since I can reach everything specified in it However, this turns out to be a problem when we use Laptops. They connect to the domain here and gets a DNS server, but when the user travels or connect the computer from home, we hit a problem. They are connected to their internet, but their DNS is 10.12.0.20 which they can't reach since they're at home and not at the office network. I solved this by removing the register key called "NameServer" with the value 10.12.0.20, but it gets set again whenever they logon to the domain the next time (when they get back to the office). Can I somehow make the computers take whatever DNS server they are handed when connecting to the internet or a home network, instead of always trying to reach the Domain Controller?

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• SSL timeout on some sites, across all browsers, on Mac OS X Snow Leopard

  - by dansays

  For the past several weeks, I've been receiving "Error 7 (net::ERR_TIMED_OUT): The operation timed out" when I attempt to connect to either Twitter or Paypal via SSL. I get this specific error in Google Chrome, but the same problem occurs in both Safari and Firefox. Other sites work fine, and other computers on my network can access these two sites. I have no firewall settings that would prevent me from accessing these sites over port 443. I notice that both Twitter and Paypal both have "Verisign Class 3 Extended Validation SSL CA" certificates. It is unclear whether this is related to the problem. In an effort to troubleshoot, I attempted to open the test sites referenced on Verisign's root certificate support page, which worked fine. Just to be sure, I downloaded and installed the root package file and installed all included Verisign certificates. No joy. I feel like I've hit a dead end. Any ideas? Update the first: I also cannot connect to FedEx.com, who also has a Verisign Class 3 Extended Validation cert. Update the second: Aaaaaaand it fixed itself. I did nothing. Or, I did something that worked, but in a delayed fashion. Frustrating, but a win is a win. I'll take it.

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• Symbolic Links Between User Accounts

  - by Pez Cuckow

  I have been using a cron job to duplicate a folder into another users account every day and someone suggested using symbolic links instead although I cannot get them to work. In summary user GAMER generates log files that they want to access via HTTP, however I only have a web-server in the user account SERVER, in the past I would copy the logs folder from GAMERS account into SERVER/public_html/. and then chmod the files so the server could access them. Trying to use symbolic links I set up a link from root (as only root can access both accounts) I used: ln -s /home/GAMER/game/logs/ /home/SERVER/public_html/logs However it seems that only root can use this link, I tried chmoding the link, all the files in the gamers /game/logs/*, /game/logs itself to 777 as well as changing chown and chgrp to server the files still cannot be read. When viewed from servers account my shell shows the link and where it is to hi-lighted in black with red text. Am I doing something wrong? Please enlighten me! /home/GAMER/game/ (chmod & chgrp) drwxrwxrwx 3 SERVER SERVER 4096 2011-01-07 15:46 logs /home/SERVER/public_html (chmod -h & chgrp -h) lrwxrwxrwx 1 server server 41 2011-01-07 19:53 logs -> /home/GAMER/game/logs/

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• Apache error "child pid XXXX exit signal exceeded file size limit (25)"

  - by Stephen Melrose

  Morning all, Apache on our internal development server stopped working last night. It's running, but all we get is a blank screen, no server errors. Examing the error log shows the following, [Fri Apr 23 09:13:57 2010] [notice] child pid XXXX exit signal exceeded file size limit (25) [Fri Apr 23 09:14:03 2010] [notice] child pid XXXX exit signal exceeded file size limit (25) [Fri Apr 23 09:14:03 2010] [notice] child pid XXXX exit signal exceeded file size limit (25) [Fri Apr 23 09:14:06 2010] [notice] child pid XXXX exit signal exceeded file size limit (25) After some Googling, we found that this is due to Apache trying to handle a file greater than it's maximum allowed limit, which by default is 2GB and is usually an error log. I did a search using find . -size +1000000k -ls (find all files greater than 1GB) in our log and web folders, but nothing showed up. I've also restarted Apache and rebooted the server itself serveral times. I've completely wiped the log folder and started a fresh. Nothing is working. Any ideas as to what else might be causing this? Thank you

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• replacing the default console emulator under Windows XP

  - by Gilles

  How can I replace the default program providing console windows under Windows XP? I know of alternative programs, and I have a shortcut to start cmd.exe in Console2. But now I want console applications to start in Console2 rather than the default console program, even when I have no control over the program that starts the console application. (I.e. a non-console program starts consoleapp.exe, and I can't change it to start Console2 instead, but I still want the application to be started inside a new instance of Console2.) (Note that I want to replace the console itself, that is, the window in which console (i.e. text mode) applications run. And I must be able to run arbitrary, unmodified console applications: a substitute for a specific console program such as Cmd won't do me any good.) EDIT: So what I'm after is a CSRSS replacement, which leads to OT: I want to know when Microsoft is going to make a decent CSRSS replacement. Not being able to adjust the width of a "terminal" by resizing the window is a complete joke. Go download the ISE already. (It's included in Win7/2008R2.) But as far as I understand this ISE is an environment for Powershell, not a general console emulator.

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• Website has become slower on a VPS, was much fast on a shared host. What's wrong?

  - by Arpit Tambi

  My shared host suspended my website stating system overload, so I moved my website to a VPS which has 4GB RAM. But for some reason the website has become very slow. This is the vmstat output - procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 1 0 0 3050500 0 0 0 0 0 1 0 0 0 0 100 0 0 Here's the Apache Benchmark output for a STATIC html page I ran on the server itself - Benchmarking www.ask-oracle.com (be patient)...apr_poll: The timeout specified has expired (70007) Total of 20 requests completed Update: Server Config: List item Centos 5.6 4 cores cpu 4 GB RAM LAMP stack with APC Wordpress Only one website It takes almost double time to load now, same website was much fast on shared hosting. I know I need to tweak some settings but have no clue where to start from? I have already tried to optimize apache, mysql etc. Update 2: CPU usage is low, see uptime output: 11:09:02 up 7 days, 21:26, 1 user, load average: 0.09, 0.11, 0.09 Update 3: When I load any webpage, browser shows "Waiting" for a long time and then page loads quickly. So I suspect server can accept only limited connections and holds extra connections in a waiting state. How to check this? Update 4: Following is the output on executing netperf TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost.localdomain (127.0.0.1) port 0 AF_INET Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 10.00 9615.40 [root@ip-118-139-177-244 j3ngn5ri6r01t3]# Here are the Apache MPM settings from httpd.conf, do they look okay? <IfModule worker.c> StartServers 5 MaxClients 100 MinSpareThreads 50 MaxSpareThreads 250 ThreadsPerChild 125 MaxRequestsPerChild 10000 ServerLimit 100 </IfModule>

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• smtpd_helo_restrictions = ..., reject_unknown_helo_hostname occasionally rejects mail I care about, how to handle?

  - by lkraav

  I have configured my postfix as follows: smtpd_helo_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unknown_helo_hostname This is working well because most spambots don't seem to have correct reverse lookups. But every once in a while I run into mail I care about getting reject, because the mail source server admin doesn't care about configuring his server correctly. For example here the server introduces itself as "srv1.xbmc.org" which has no DNS record and fails my basic check. Jan 6 04:42:36 mail postfix/smtpd[660]: connect from xbmc.org[205.251.128.242] Jan 6 04:42:37 mail postfix/smtpd[660]: NOQUEUE: reject: RCPT from xbmc.org[205.251.128.242]: 450 4.7.1 <srv1.xbmc.org>: Helo command rejected: Host not found; from=<[email protected]> to=<[email protected]> proto=ESMTP helo=<srv1.xbmc.org> I have tried to contact the server admin several times, but there is no response. What is the optimal way to handle this from my side? Is adding these "special" hosts to mynetworks = my only option? Is perhaps my whole smtpd_helo_restrictions setup wrong in some significant way?

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• How to make Virtualbox, OpenVPN, and Win2008 Web R2 like one another?

  - by Aquitaine

  Back with web developer guy wearing net admin hat. Hopefully this is an easy one. We have two servers on a public network at a hosted facility. Server A is our public-facing web server and server B is our database server. Both are running Windows 2008 Server R2 Web Edition. We want Server B isolated from everything except Server A, such that anyone who has to connect to server B goes through the VPN on Server A. It's not perfect since we have no access to do this on the router side, but it's what we've got. We've set up VirtualBox and OpenVPN Access Server on Server A. It has one network interface set to 'NAT' mode, such that OpenVPN gets its IP at 10.0.2.x, and to connect to the OpenVPN interface, I go to the local IP for the Virtualbox network adapter, 192.168.56.x, which works as I configured the appropriate ports using VBoxManage. My question is, do I need to be using Bridged Networking and give the VPN server its own IP, or is there some way to tell the server (either Windows or the Virtualbox OpenVPN) that 'any public connection on the real external IP on port X should be directed to this internal LAN address of 192.168.1.x on port Y'? OpenVPN itself doesn't seem to be aware of the server's real external IP unless we put it in Bridged networking mode; is that necessary or advisable? We're without RRAS since this is Web edition, but I feel like what we're going for is pretty simple. Thanks! Aq

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• What precautions should I take once defective RAM has been replaced?

  - by DustByte

  I recently discovered that my RAM is faulty (MemTest86+). I am waiting for new RAM to be sent to me.  It was through sheer luck that I discovered something was wrong. I was copying a large amount of big files and decided to verify the copies by their checksums. I discovered strange discrepancies, and noticed that checksum computation for the same file was not consistent. Now, this is the only problem I have encountered; no BSOD, no crashes, no errors. In a sense this makes me more worried than if I would have had massive crashes. I have no idea for how long the RAM has been faulty, and I have no idea if corrupt bits have been saved into files on my hard drives. I do know the RAM was fine two months ago (tested it back then). I am a user of Adobe's Lightroom and I am worried that photos or the catalog itself could carry corrupt data. Question: what should I do once new healthy RAM has been installed? Reinstall Windows (I'm using Windows 7, 64 bit)? Is there a risk that I will be presented with nasty surprises in the future if I don't? What about personal files? I have backups of some of the files but for newer files I'm not sure I can even trust the backups. It's going to take me many hard hours to manually replace files with older versions, or compare checksums.

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• Building a Web proxy to get around same-origin restrictions for collaborative Webapp based on a MEAN stack

  - by Lew Cohen

  Can anyone point to books, articles, blogs, or even applications - open-source or proprietary - that detail building a Web proxy? This specific proxy will exist to get around the same-origin restrictions that prevent, for instance, loading a given Website into an <iframe> in a Webapp. This Webapp is a collaborative application in which a group of users log in to the app's Website and can then load different Websites into this app's <iframe> and do various collaborative things (e.g., several users simultaneously browsing a Website, in synch). The Webapp itself is built on a MEAN stack (MongoDB, Express, AngularJS, and Node.js). The purpose of this proxy is not to do anonymous browsing or to bypass censorship. Information on how to build such a vehicle seems not to be readily available from my research. I've come across Glype but am not sure whether this is a feasible solution. I don't want to reinvent the wheel, so if a product is available for purchase, great. Else, we'd need to build one. The one that seems to be close is http://www.corsproxy.com. In effect, we'd like to re-create this since it evidently does what's needed. I don't care what server-side technology is used. Our app is MEAN-based, if that has any bearing. Also, the proxy has to obviously honor basic security considerations (user cookies, etc.) and eventually be scalable. So, anyone know of any sources that would detail how to build one of these? Is it even worth building if something already exists? If so, what would be a good candidate? Any other issues that should be considered with this proxy/application? Thanks a lot!

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• Concatenating ogg video files from the command line

  - by Noufal Ibrahim

  Okay. I've got a few ogg files I've created using a desktop recording tool. I've transcoded them using ffmpeg once (mainly to clip out the beginnings and the ends). Now, I have 3 such files which I want to concatenate into a single .ogv file. I tried using oggCat, it crashed with some kind of error (I tried concatenating a file to itself using oggCat and that failed too leading me to believe that my distro is shipping a broken version of the package). Simply cating the files works but I can't seek which is not cool. mencoder run like this mencoder -ovc lavc -oac lavc file1.ogv file2.ogv file3.ogv -o complete.ogv. It transcodes the files into an avi and clips off a little of the 3 videos. So, how do I do this? Update 1: My current workaround is to transcode the 3 files into .mpg using ffmpeg, then cating them together and then transcoding them back into ogv. Update 2: PiTiVi works for this kind of thing but I need something from the command line that I can automate and script.

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• FastGate A20 Line And Himem.sys Issue With Updating BIOS

  - by Boris_yo

  I have been persistent with a thought to perform my first BIOS update ever through MS-DOS but have been postponing this task until today. Despite people telling me any bootable ISO will do it either through CD-ROM or RAMDRIVE, I am still having problems. First is the problem with CD-ROM driver trying to make it work with 4 driver files (cd1.SYS, cd2.SYS, cd3.SYS, cd4.SYS) as well as starting RAMDISK proved to be failure: CD-ROM XMS Allocation Error RAMDISK XMS Allocaton Error (X: and R: drives not working) This A20 line seemed to be the obstacle which then after a couple of searches pointed me to this article on Microsoft website. It seems that FastGate is the culprit which takes over A20 line and conflicts with himem.sys which should be handling it causing the driver to be unable to allocate memory resources. Albeit article suggests 2 workarounds which is disabling FastGate option or adding switch, I read that the former workaround could cause problems which involves later tinkering BIOS, disabling shadow copy etc. while the latter workaround can just hang system as stated in the link above. I assume it just hangs the boot process from image file though. Summing up the above, I am cautious and think it is risky to follow both workarounds because disabling FastGate or trying adding switch by trying available switches from 1-14 or 16, could crash the BIOS update process by itself. I could do this without the need for himem.sys with bootable USB thumbdrive by making it to be seen as USB-HDD, but some time ago I read that it is never a good idea to update BIOS from hard drive so even thought it is simulation, who knows... Maybe it will deactivate hard drive in the middle of the BIOS update process or even USB thumbdrive per se? One forum discussion was about updating BIOS and somebody suggested to not load himem.sys for some reason, but now that I think of it, what if BIOS update needs upper memory?

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• Samsung laptop randomly shuts down

  - by Dmatig

  I've rewritten this question because it turned into an indecipherable mess. I have a Samsung R560 laptop that is overheating, and shutting itself down under load consistantly. Thank you quickcel for reccomending me Speedfan to monitor my temps. Here they are (Load / Idle): (Ignore "Temp1 and Temp2", whatever sensors they are they'd always random, pretty sure they're broke). The load temperature is after just 5 minites of playing Fallout 3 - another 5 minutes and it (the GPU - 9600M GS) consistantly breaches the mid 90's then shuts down, so it's hard to get a good picture of it. I'm looking for some solution or way to decrease these temperatures, because they seem far too high even idle. I've tried: Opening up the case and clearing of all dust with compressed air. Updating drivers for my Graphics card Have purchased and am using a notebook cooler I don't want to: Undervolt / underclock (defeats the point of having a more expensive card) Use lower power / performance settings (again, i might as well have bought something cheaper) Is there anything else i can try (software or inexpensive hardware) that can help me fix this? Has anybody had a Samsung laptop and knows if this can be sorted under my warranty, and the turnaround time of sending it off (UK?)(it has always ran hotter than it should, but now at 6 months old is getting hot enough to power off)

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• When connecting to PPTP Centos via Windows 7 VPN, I get error 2147943625

  - by Charlie Dyason

  The remote computer refused the network connection. phrase has been my arch enemy for the past week now I recently "bought" a VPS server, I gave up trying to configure it with OpenVPN, all the issues were making me lose my mind, so I tried the easier way with pptp, but i figure, both are leading to a dead end... I followed this post (many others too but this is the unlucky one), http://blog.secaserver.com/2011/10/install-vpn-pptp-server-centos-6/ and it all goes well with the setup, however, I run into this error when connecting to the VPN in Windows 7 here is a pic of the error: Image So I do not know what I have done wrong... When connecting, Code: Select all netstat -apn | grep -w 1723 before connecting: netstat -apn |grep -w 1723 tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN 1137/pptpd after the error came I tried again: netstat -apn |grep -w 1723 tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN 1137/pptpd tcp 0 0 41.185.26.238:1723 41.13.212.47:49607 TIME_WAIT - iptables: # Generated by iptables-save v1.4.7 on Fri Nov 1 18:14:53 2013 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [63:8868] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i eth0 -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A INPUT -i eth0 -p tcp -m tcp --dport 1723 -j ACCEPT -A INPUT -i eth0 -p gre -j ACCEPT -A FORWARD -i ppp+ -o eth0 -j ACCEPT -A FORWARD -i eth0 -o ppp+ -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Fri Nov 1 18:14:53 2013 # Generated by iptables-save v1.4.7 on Fri Nov 1 18:14:53 2013 *nat : PREROUTING ACCEPT [96:12732] : POSTROUTING ACCEPT [0:0] : OUTPUT ACCEPT [31:2179] -A POSTROUTING -o eth0 -j MASQUERADE COMMIT # Completed on Fri Nov 1 18:14:53 2013 options.pptpd the only changes was the require-mppe # BSD licensed ppp-2.4.2 upstream with MPPE only, kernel module ppp_mppe.o # {{{ refuse-pap refuse-chap refuse-mschap # Require the peer to authenticate itself using MS-CHAPv2 [Microsoft # Challenge Handshake Authentication Protocol, Version 2] authentication. require-mschap-v2 require-mppe # Require MPPE 128-bit encryption # (note that MPPE requires the use of MSCHAP-V2 during authentication) require-mppe-128 # }}} I check the iptables, everything is normal, all INPUTs, etc are before rejects, username and password I also checked in chap-secrets file, I am really puzzled...

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• ports only available from the outside network

  - by ChrisJ

  This is a counter-intuitive problem for me. I have a new Win 2003 server on a static IP address w.x.y.z. Tomcat 7, PostgreSQL 9.1, and Subversion are installed. All of it appears to be working fine from the server itself. We can also access the Tomcat manager, web applications, and run "svn ls svn://w.x.y.z/" from outside our network. However, when I try from another machine in the office, phpPgAdmin and svn cannot establish connections with the server. http://w.x.y.z:5432/phppgadmin cannot connect. The svn command from above returns: svn: E730061: Unable to connect to a repository at URL 'svn://w.x.y.z/' svn: E730061: Can't connect to host 'w.x.y.z': No connection could be made because the target machine actively refused it. Tomcat manager and the other web apps we have deployed work fine. Netstat -a from the server shows this: Proto Local Address Foreign Address State TCP SERVERNAME:3690 SERVERNAME:0 LISTENING TCP SERVERNAME:5432 SERVERNAME:0 LISTENING Windows Firewall was off, but just in case I also tried to enable it and open ports 3690 (svn) and 5432 (postgres). No change. I don't have access to the router/switch because it just doesn't work that way in Port-au-Prince and our sysadmin is on R&R. Is there anything that might be causing the problem from the server side?

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• iptables secure squid proxy

  - by Lytithwyn

  I have a setup where my incoming internet connection feeds into a squid proxy/caching server, and from there into my local wireless router. On the wan side of the proxy server, I have eth0 with address 208.78.∗∗∗.∗∗∗ On the lan side of the proxy server, I have eth1 with address 192.168.2.1 Traffic from my lan gets forwarded through the proxy transparently to the internet via the following rules. Note that traffic from the squid server itself is also routed through the proxy/cache, and this is on purpose: # iptables forwarding iptables -A FORWARD -i eth1 -o eth0 -s 192.168.2.0/24 -m state --state NEW -j ACCEPT iptables -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A POSTROUTING -t nat -j MASQUERADE # iptables for squid transparent proxy iptables -t nat -A PREROUTING -i eth1 -p tcp --dport 80 -j DNAT --to 192.168.2.1:3128 iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128 How can I set up iptables to block any connections made to my server from the outside, while not blocking anything initiated from the inside? I have tried doing: iptables -A INPUT -i eth0 -s 192.168.2.0/24 -j ACCEPT iptables -A INPUT -i eth0 -j REJECT But this blocks everything. I have also tried reversing the order of those commands in case I got that part wrong, but that didn't help. I guess I don't fully understand everything about iptables. Any ideas?

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• Is there a way in Windows 7 to disable "journaling"?

  - by Psycogeek

  C:\$extend\$Usn.Jrnl:$J:$data Here is a picture finally. The large strip in the center of the top band is the largest chunk, in the other, grey areas are the various clusters with it. On the right, the big long grey line is $logfile (not paging), and it is 63&nbsb;MB. Paging, 500&nbsb;MB is the dark cyan chunk, next to the yellow MFTres in the inner rings.. The disk was defragged so they could be seen easier. Not all clusters of this type of file are tagged, but the idea is there. The disk is 4k clusters, now about 12 GB size. Each cute little block in the picture is .81 MB and represents 207 clusters. The dkGreen section, is mostly the whole Winsxs pile, also interesting when they keep telling us it doesn't take much disk space. Wikipedia suggests that in previous NT systems "USN journaling" would be turned on when enabled (assumes it could also be turned off?). What aspects, services, or program is working on putting that stuff all over the disk which is known by $jrnl$ type clusters, even if it is not actual USN journaling? Is it possible in a Windows 7 system to completly disable the journaling, and what would be the ramifications of that? On a Windows XP NTFS system, I do not recall seeing the quantity of disk clusters used with these $jrnl$ names, so I do not recall this being necessary in this quantity for an NTFS file system itself? I understand that it would not be there, if it did not have a useful function :-) Information about how wonderful is fine, if that information will help track down what parts of the system create and use it. Change Journals states: Change journals are also needed to recover file system indexing Hmm, that might explain some of them, or why it was left on the disk. A crash while background indexing?

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• How to burn a data DVD in Windows XP

  - by SabreWolfy

  I am trying to burn a data DVD (DVD+R) in Windows XP SP3 on a Dell desktop computer. The computer has a licensed copy of Nero 6.3. Nero indicates that an update to version 6.6 is available, but after following the link provided, it redirects me to the Nero website to purchase the upgrade. I'm not interested in doing this. After creating a project in Nero 6.3, inserting a blank DVD+R and trying to start burning the data DVD, Nero indicates that I should insert an appropriate disk into the drive. It does not seem to detect the blank DVD+R. I downloaded infrarecorder and cdrtfe from Sourceforge. Neither of these programs worked either. They both indicated that I should insert the correct media, with cdrtfe saying there is no disk in the drive. I tried with another blank DVD +R with the same effect. I inserted a CDR containing data into the drive and the Windows read read this CDR without a problem. I have no reason to believe that the drive is faulty. I am aware that Windows XP itself is not able to burn DVDs. However, it seems that three third-party software programs are not able to burn a data DVD in Window XP. The specifications provided in Nero indicate that DVD+R is compatible with the drive. How can I burn a backup data DVD in Windows XP?

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• How to debug silent hang on shutdown of Solaris 10?

  - by jblaine

  We're experiencing a mysterious hang on shutdown of a newly-imaged Oracle/Sun Solaris 10 SPARC box. It is repeatable (in the same spot ... from what we can tell). We let it try to work itself out multiple times for 5-10 minutes and it never progressed. I've never seen this happen before. The last thing displayed on the console is that syslogd was sent signal 15. Prior to us disabling snmpdx on the box, the last thing on the console was that snmpdx was sent signal 15 (after syslogd was sent signal 15). While very rare to find, in Solaris days past, I'd have a better idea from experience where the problem might be, and could then narrow things down further with silly (but effective) debugging echo statments in /etc/*.d scripts. With SMF in the picture, I'm not really quite sure where to start. We forced a crash dump via sync at the {ok} prompt for later analysis, and then let the box come up because it's a production server and our scheduled outage window was closing. /var/adm/messages shows nothing of use. How would you debug this situation? mdb ps of the savecore shows the following processes were running at hang time (afsd is the OpenAFS client and that many are expected): > > ::ps S PID PPID PGID SID UID FLAGS ADDR NAME R 0 0 0 0 0 0x00000001 00000000018387c0 sched R 108 0 0 0 0 0x00020001 00000600110fe010 zpool-silmaril-p R 3 0 0 0 0 0x00020001 0000060010b29848 fsflush R 2 0 0 0 0 0x00020001 0000060010b2a468 pageout R 1 0 0 0 0 0x4a024000 0000060010b2b088 init R 1327 1 1327 329 0 0x4a024002 00000600176ab0c0 reboot R 747 1 7 7 0 0x42020001 0000060017f9d0e0 afsd R 749 1 7 7 0 0x42020001 00000600180104d0 afsd R 752 1 7 7 0 0x42020001 0000060017cb44b8 afsd R 754 1 7 7 0 0x42020001 0000060017fc8068 afsd R 756 1 7 7 0 0x42020001 0000060017fcb0e8 afsd R 760 1 7 7 0 0x42020001 00000600177f4048 afsd R 762 1 7 7 0 0x42020001 000006001800f8b0 afsd R 764 1 7 7 0 0x42020001 000006001800ec90 afsd R 378 1 378 378 0 0x42020000 0000060013aee480 inetd R 7 1 7 7 0 0x42020000 0000060010b28008 svc.startd R 329 7 329 329 0 0x4a024000 00000600110ff850 sh Z 317 7 317 317 0 0x4a014002 0000060013b3a490 sac

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• How to determine the Kerberos realm from an LDAP directory?

  - by tstm

  I have two Kerberos realms I can authenticate against. One of them I can control, and the other one is external from my point of view. I also have an internal user database in LDAP. Let's say the realms are INTERNAL.COM and EXTERNAL.COM. In ldap I have user entries like this: 1054 uid=testuser,ou=People,dc=tml,dc=hut,dc=fi shadowFlag: 0 shadowMin: -1 loginShell: /bin/bash shadowInactive: -1 displayName: User Test objectClass: top objectClass: account objectClass: posixAccount objectClass: shadowAccount objectClass: person objectClass: organizationalPerson objectClass: inetOrgPerson uidNumber: 1059 shadowWarning: 14 uid: testuser shadowMax: 99999 gidNumber: 1024 gecos: User Test sn: Test homeDirectory: /home/testuser mail: [email protected] givenName: User shadowLastChange: 15504 shadowExpire: 15522 cn: User.Test userPassword: {SASL}[email protected] What I would like to do, somehow, is to specify per-user basis to which authentication server / realm the user is authenticated against. Configuring kerberos to handle multiple realms is easy. But how to I configure other instances, like PAM, to handle the fact that some users are from INTERNAL.COM and some from EXTERNAL.COM? There needs to be an LDAP lookup of some kind where the realm and the authentication name is fetched from, and then the actual authentication itself. Is there a standardized way to add this information to LDAP, or look it up? Are there some other workarounds for a multi-realm user base? I might be ok with a single realm solution, too, as long as I can specify the user name - realm -combination for the user separately.

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• How to get an inactive RAID device working again?

  - by Jonik

  After booting, my RAID1 device (/dev/md_d0 *) sometimes goes in some funny state and I cannot mount it. * Originally I created /dev/md0 but it has somehow changed itself into /dev/md_d0. # mount /opt mount: wrong fs type, bad option, bad superblock on /dev/md_d0, missing codepage or helper program, or other error (could this be the IDE device where you in fact use ide-scsi so that sr0 or sda or so is needed?) In some cases useful info is found in syslog - try dmesg | tail or so The RAID device appears to be inactive somehow: # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md_d0 : inactive sda4[0](S) 241095104 blocks # mdadm --detail /dev/md_d0 mdadm: md device /dev/md_d0 does not appear to be active. Question is, how to make active the device again (using mdmadm, I presume)? (Other times it's alright (active) after boot, and I can mount it manually without problems. But it still won't mount automatically even though I have it in /etc/fstab: /dev/md_d0 /opt ext4 defaults 0 0 So a bonus question: what should I do to make the RAID device automatically mount at /opt at boot time?) This is an Ubuntu 9.10 workstation. Background info about my RAID setup in this question.

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• Can I use a Windows Server 2003 Domain Controller but my home router for DNS?

  - by NetworkingWannabie

  Hi All Probably easiest to start with a description of my current setup, which works (oh, and this is a home setup not an office or anything): I have an ADSL modem with a static IP address (192.168.128.1), and its DHCP capability is disabled. I have a permanently powered up Windows Server 2003 machine with a fixed IP (192.168.128.2) which provides my domain controller, dhcp, and dns. The default gateway for everything is my ADSL modem everything is setup to use the WS2003 machine as the primary DNS with the ADSL modem as Secondary DNS just in case the server goes down (everything includes the server itself). Lastly, just in case it's relevant, I have my DHCP leases set to infinite (or whatever the right term is). Everything is pretty hunky dory. Except, that is, for the fact that my server is ALWAYS on, and it isn't always used, so I'm burning juice that I don't need to - my server burns around 120W which isn't immense but isn't irrelevant either, so I'd like to put it into a stand-by state when it isn't being used (the more standby the better) and then get the clients to wake it up. Am I correct in assuming that this won't work at the moment - A given client would need an IP address to wake the machine up, and it needs to machine to be awake to get an IP - catch 22? Assuming I'm correct, can I move to using my router (which is always on) for DHCP? What impact will this have on DC and DNS? Alternatively, does anyone have a better way for me to achieve this? Can I get the server to wake up when it sees clients look for a DHCP server, etc? Wow, that came out longer than expected! Thanks for your help.

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• Dell PS/2 Keyboard Stops Working Randomly After Power Disturbance

  - by Kenneth Murphy

  I have a Dell PS/2 keyboard connected to a desktop PC running Slackware 12.2 & Windows XP. After a recent, brief power outage/disturbance at my home, the keyboard has begun to quit working at random times. It has stopped at POST, but not by keyboard error -- I have to press the F1 key to continue booting, and at times the keyboard has already stopped working. Other times, the keyboard will work perfectly for a long time (a day or more) before it finally quits. It has stopped at boot, in Windows XP, and in Slackware. The led lights continue to work regardless. I have tried another PS/2 keyboard and it seems to be immune to this problem. The USB mouse always works. Does anyone have any ideas about how this might have happened? If this is related to the power disturbance that killed the power to the running PC, is it feasible that it would have only fried the keyboard itself (which still works sometimes) and not the PS/2 port nor anything else? I have experienced no other problems since the event.

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• MySQL partition "full"?

  - by gdea73

  I have a server that runs Debian 6.2, with Apache, PHP5, and MySQL. Well, I hadn't done anything with MySQL at all so far, just Apache and PHP; I must have installed it (mysql-server) at some point along the line, and I decided to login to the database for the first time a couple days ago as I was considering using the database for a future website project. I noticed that the "root" user had a password, and I didn't recall having set one. My usual root password was incorrect. So I attempted to reset the password. sudo service mysql stop (stopped successfully) sudo /usr/bin/mysqld_safe --skip-grant-tables --skip-networking & started successfully, from what I can tell. However, mysql itself returns "Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld,sock' (2)", and additionally sudo service mysql start returns "/etc/init.d/mysql: ERROR: The partition with /var/lib/mysql is too full! ... failed!" df -h tells me that / is 26% used, a 20GB partition, and /home, roughly 900GB, has only 5% usage. On a potentially related note, I've been experiencing random hangs since I noticed this problem, my tty2 randomly froze several times while idle, and the entire system is suddenly unstable. gnome-terminal also does not open. (Gnome-terminal apparently works now, disregard that part, but the server is still being somewhat unstable, I randomly lost connection when I was SSHed into it from my laptop, twice now.)

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• Windows cannot open directory with too long name created by Linux

  - by Tim

  Hello! My laptop has two OSes: Windows 7 and Ubuntu 10.10. A partition of Windows 7 of format NTFS is mounted in Ubuntu. In Ubuntu, I created a directory under somehow deep path and with a long name for itself, specifically, the name for that directory is "a set of size-measurable subsets ie sigma algebra". Now in Windows, I cannot open the directory, which I guess is because of the name is too long, nor can I rename it. I was wondering if there is some way to access that directory under Windows? Better without changing the directory if possible, but will have to if necessary. Thanks and regards! Update: This is the output using "DIR /X" in cmd.exe, which does not shorten the directory name: F:\science\math\Foundations of mathematics\set theory\whether element of a set i s also a set\when element is set\when element sets are subsets of a universal se t\closed under some set operations\sigma algebra of sets>DIR /X Volume in drive F is Data Volume Serial Number is 0492-DD90 Directory of F:\science\math\Foundations of mathematics\set theory\whether elem ent of a set is also a set\when element is set\when element sets are subsets of a universal set\closed under some set operations\sigma algebra of sets 03/14/2011 10:43 AM <DIR> . 03/14/2011 10:43 AM <DIR> .. 03/08/2011 10:09 AM <DIR> a set of size-measurable sub sets ie sigma algebra 02/12/2011 04:08 AM <DIR> example 02/17/2011 12:30 PM <DIR> general 03/13/2011 02:28 PM <DIR> mapping from sigma algebra t o R or C i.e. measure 02/12/2011 04:10 AM <DIR> msbl mapping from general ms bl space to Borel msbl R or C 02/12/2011 04:10 AM 4,928 new file~ 03/14/2011 10:42 AM <DIR> temp 03/02/2011 10:58 AM <DIR> with Cartesian product of se ts 1 File(s) 4,928 bytes 9 Dir(s) 39,509,340,160 bytes free

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