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• Creating security permissions for a non-domain-member user in Windows Server 2008

  - by Overhed

  Hello everyone, I apologize in advance for incorrect use of terminology, as I'm not an IT person by trade. I'm doing some remote work via a VPN for a client and I need to add some DCOM Service security permissions for my remote user. Even though I'm on the VPN, the request for access to the DCOM service is using my PCs native user (and since I'm running Vista Home Premium it looks something like: PC-NAME\Username). The request for access comes back with access denied and I can not add this user to the security permissions as it "is not from a domain listed in the Select Location dialog box, and is therefore not valid". I'm pretty stuck and have no clue what kind of steps I need to do here. Any help would be appreciated, thanks in advance. EDIT: I have no control over what credentials are being passed in to the server by my computer. This scenario is occurring in an installation wizard that has a section which requests you point it to the machine running the "server" version of the software I'm installing (it then tries to invoke the relevant COM service, but my user does not have "Remove Activation Permissions" on that service, so I get request denied).

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• Converting PDF eBooks into a Kindle format

  - by Ender

  Over the past couple of years I've amassed quite a collection of guides, tutorials and ebooks in PDF format. A lot of these are quite useful for work, especially PDF documentation, and rather than have to be at a computer every time I want to read how to do something in Sitecore or to read through a software testing ebook I'd like to do it on my brand-spanking-new Kindle. However, even though there is now a native PDF reader on the Kindle due to the nature of PDF's they are practically unreadable. The text doesn't wrap due to how PDF's are sized and so far after a bunch of Google searches I've yet to find a viable solution to get my PDF's converted into a readable Kindle format. Sometimes these books have code or pictures/tables in them, but most of the time they're text-heavy and to be honest I'd be surprised if there wasn't a free tool to handle the converting of PDF to one of the (seemingly many) Kindle formats. So, can anyone help me out with this? EDIT: I've tried Calibre, and have checked their forums to play with some of the advanced settings, yet the solutions available seem to be extremely poor, especially if the book you're attempting to read contains equations, code, or anything outside of plain text. I've also tried Amazon's conversion service, which wasn't much help with such documents. The best way I have found so far is to build the entire thing over again in ePub or RTF format and convert to MOBI from there. This works for text-heavy books with tables, but anything technical still isn't covered. Can anyone help with this?

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• LXC, Port forwarding and iptables

  - by Roberto Aloi

  I have a LXC container (10.0.3.2) running on a host. A service is running inside the container on port 7000. From the host (10.0.3.1, lxcbr0), I can reach the service: $ telnet 10.0.3.2 7000 Trying 10.0.3.2... Connected to 10.0.3.2. Escape character is '^]'. I'd love to make the service running inside the container accessible to the outer world. Therefore, I want to forward port 7002 on the host to port 7000 on the container: iptables -t nat -A PREROUTING -p tcp --dport 7002 -j DNAT --to 10.0.3.2:7000 Which results in (iptables -t nat -L): DNAT tcp -- anywhere anywhere tcp dpt:afs3-prserver to:10.0.3.2:7000 Still, I cannot access the service from the host using the forwarded port: $ telnet 10.0.3.1 7002 Trying 10.0.3.1... telnet: Unable to connect to remote host: Connection refused I feel like I'm missing something stupid here. What things should I check? What's a good strategy to debug these situations? For completeness, here is how iptables are set on the host: iptables -F iptables -F -t nat iptables -F -t mangle iptables -X iptables -P INPUT DROP iptables -P FORWARD ACCEPT iptables -P OUTPUT ACCEPT iptables -A INPUT -p tcp --dport 22 -j ACCEPT iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE iptables -t nat -A POSTROUTING -o lxcbr0 -j MASQUERADE iptables -t nat -A PREROUTING -p tcp --dport 7002 -j DNAT --to 10.0.3.2:7000

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• How can I use HAproxy with SSL and get X-Forwarded-For headers AND tell PHP that SSL is in use?

  - by Josh

  I have the following setup: (internet) ---> [ pfSense Box ] /-> [ Apache / PHP server ] [running HAproxy] --+--> [ Apache / PHP server ] +--> [ Apache / PHP server ] \-> [ Apache / PHP server ] For HTTP requests this works great, requests are distributed to my Apache servers just fine. For SSL requests, I had HAproxy distributing the requests using TCP load balancing, and it worked however since HAproxy didn't act as a proxy, it didn't add the X-Forwarded-For HTTP header, and the Apache / PHP servers didn't know the client's real IP address. So, I added stunnel in front of HAproxy, reading that stunnel could add the X-Forwarded-For HTTP header. However, the package which I could install into pfSense does not add this header... also, this apparently kills my ability to use KeepAlive requests, which I would really like to keep. But the biggest issue which killed that idea was that stunnel converted the HTTPS requests into plain HTTP requests, so PHP didn't know that SSL was enabled and tried to redirect to the SSL site. How can I use HAproxy to load balance across a number of SSL servers, allowing those servers to both know the client's IP address and know that SSL is in use? And if possible, how can I do it on my pfSense server? Or should I drop all this and just use nginx?

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• How to connect via SSH to a linux mint system that is connected via OpenVPN

  - by Hilyin

  Is there a way to make SSH port not get sent through VPN so when my computer is connected to a VPN, it can still be remoted in via SSH from its non-VPN IP? I am using Mint Linux 13. Thank you for your help! This is the instructions I followed to setup the VPN: Open Terminal Type: sudo apt-get install network-manager-openvpn Press Y to continue. Type: sudo restart network-manager Download BTGuard certificate (CA) by typing: sudo wget -O /etc/openvpn/btguard.ca.crt http://btguard.com/btguard.ca.crt Click on the Network Manager icon, expand VPN Connections, and choose Configure VPN A Network Connections window will appear with the VPN tab open. Click Add. 8. A Choose A VPN Connection Type window will open. Select OpenVPN in the drop-down menu and click Create.. . In the Editing VPN connection window, enter the following: Connection name: BTGuard VPN Gateway: vpn.btguard.com Optional: Manually select your server location by using ca.vpn.btguard.com for Canada or eu.vpn.btguard.com for Germany. Type: select Password User name: username Password: password CA Certificate: browse and select this file: /etc/openvpn/btguard.ca.crt Click Advanced... near the bottom of the window. Under the General tab, check the box next to Use a TCP connection Click OK, then click Apply. Setup complete! How To Connect Click on the Network Manager icon in the panel bar. Click on VPN Connections Select BTGuard VPN The Network Manager icon will begin spinning. You may be prompted to enter a password. If so, this is your system account keychain password, NOT your BTGuard password. Once connected, the Network Manager icon will have a lock next to it indicating you are browsing securely with BTGuard.

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• Setup: Eclipse in Ubuntu with Apache2 and Subversion

  - by Ricalsin

  Trying to setup Eclispe. I am running ubuntu 10.10 (Maverick). Apache2.2.16 Subversion 1.6.12 The Eclipse help/about/installed software says: Eclipse Platform 3.5.2 Subclipse 1.0.0 Version Control with Subversion 1.1.1 The Subclips wiki I followed is here I have installed the libsvn-java app as discussed. I added the line "-Djava.library.path=/usr/lib/jni" to the eclipse.ini file I checked the Eclipse help/about/confirguration settings and both of these lines are listed: eclipse.vmargs=-Djava.library.path=/usr/lib/jni java.library.path=/usr/lib/jni I checked that those files are in those directories. Still, when I check the preferencesteamsvn an error dialog shows: Failed to load JavaHL Library. These are the errors that were encountered: no libsvnjavahl.1 in java.library.path Incompatible JavaHL library loaded 1.3.x or later required I followed the "Testing JavaHL libraries" troubleshooting section at the bottom of the wiki: I downloaded the tarbal and ran it in a folder on my desktop with no problems. Then, I followed the instructions and placed that file INSIDE the path (usr/lib/jni/testJavaHL) and ran it from there. There are 50 tests performed and each one of them came back with this same error (posting only one for brevity): 50) testCommitRevprops(org.tigris.subversion.javahl.BasicTests)java.io.FileNotFoundException: /usr/lib/jni/testJavaHL/local_tmp/greek_files/iota (No such file or directory) at java.io.FileOutputStream.open(Native Method) at java.io.FileOutputStream.<init>(FileOutputStream.java:209) at java.io.FileOutputStream.<init>(FileOutputStream.java:160) at org.tigris.subversion.javahl.WC.materialize(WC.java:70) at org.tigris.subversion.javahl.SVNTests.buildGreekFiles(SVNTests.java:303) at org.tigris.subversion.javahl.SVNTests.setUp(SVNTests.java:222) at org.tigris.subversion.javahl.RunTests.main(RunTests.java:111) FAILURES!!! Tests run: 50, Failures: 0, Errors: 50 Any ideas as to how/why the "local_tmp/greek_files/iota" is appended to the directory? I assume that's my problem.. I'm also having a problem with newrepository location = ...as the directory location of my svn repository is one level above the home directory - which is prepended to whatever I place in the dialog box - resulting in this error: svn: '/home/ricalsin/file:/home/svn' does not exist Thank you for any help.

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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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• Intermittent Trouble Entering Hibernate on WinXP

  - by kquinn

  My personal desktop, running 32-bit Windows XP SP2 (with 4GB RAM, 2.75GB addressable, swap disabled, hiberfil.sys existing and contiguous on C:\; SP3 is not installed because SP2 has been working fine and I do not want to re-qualify with SP3 just for sheer perversity) typically gets hibernated at night. For a long time this worked great, but recently the machine has had trouble entering hibernation. Sometimes when I press my power button (configured to hibernate), the box will start the procedure for hibernating (i.e., go to the blue "Windows XP" background logo and display a message about entering hibernation), but before displaying the usual blue-on-black hibernation progress bar it will drop back to the desktop. No error messages appear, on screen or in the system log. The only record of unsuccessful hibernation attempts in the system log, which proudly proclaims that "The Windows Image Acquisition (WIA) service entered the running state." once per failed hibernation attempt. The problem is almost certainly resource related: if I then close one or more applications which are running, and repeat the exact same process, the machine will hibernate perfectly. There does not appear to be a reliable high-water mark for virtual or physical memory use, below which the machine is guaranteed to hibernate; it's different every time (though typically, below about 1.1–1.4 GB memory usage seems to be where hibernate succeeds most often). Memory may not even be the relevant resource; as far as I know, it could also be handles or sockets. This behavior is relatively recent: it has only started in the last few months; before then, I could hibernate reliably no matter what the current resource use of the system. This machine claims to have hotfix Q909095 installed, but since the symptoms of my problem match KB909095 rather well, I'm suspicious if this fix is actually working as intended. Any ideas on how to fix this or where to start debugging?

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• Troubleshooting an overheating CPU

  - by Jeff Fry

  I & my father just recently put together a new PC. Specs below. From the very beginning, on boot it will often complain that the CPU is too hot. If I sit in BIOS and watch the CPU, it'll drop back down from red to blue (<72C), at which point I've tended to just boot into Windows...and haven't had any problems. In fact, I've played a couple hours straight of Skyrim at max settings, and not had any visible issues. That said, I've occasionally walked away & come back to find that it's crashed. Yesterday, it crashed (while idle) twice in 12 hours, which shifted the balance from busy-with-life to nervous-I'm-about-to-melt-something. I just installed Core Temp which is showing my 4 cores fluxuating between 70-98C. I'm guessing at this point that the CPU fan may be incorrectly installed or defective. My first thought is to either (a) add water cooling (which the case supports) and / or (b) replace the CPU fan with an after-market one. That said, I'm very open to suggestions. A note, while I certainly don't want to burn money here, I have a baby coming any day now and am still unpacking from a recent move so if I have a choice between an option that costs money and another that takes a while...I'll happily spend a bit extra. Side question: Should I be nervous to even have this on at this point? Let me know if there's something useful I could add to my report. Otherwise, I'm looking forward to your suggestions! Thanks. CPU Intel i7-2600 CPU w/ stock fan Other HW ASUS P8Z68-V Pro motherboard 64G SSD boot drive 4 older SATA HDs GIGABYTE ATI Radeon HD6950 1 GB DDR5 8G Kingston T1 Series RAM Corsair 650W Gold Certified power supply Antec P280 case

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• High data on recv-q buffer and thread lock on java.io.BufferedInputStream in linux

  - by Sagar Patel

  We have a java application running on linux (ubuntu server). We have been facing high recv-q problem since quite some time. Application gets hang and does not read data from socket every few hours. In thread dump, we have found below stack trace. "Receiver-146" daemon prio=10 tid=0x00007fb3fc010000 nid=0x7642 runnable [0x00007fb5906c5000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream. socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:150) at java.net.SocketInputStream.read(SocketInputStream.java:121) at java.io.BufferedInputStream.fill(BufferedInputStream.java:235) at java.io.BufferedInputStream.read1(BufferedInputStream.java:275) at java.io.BufferedInputStream.read(BufferedInputStream.java:334) - locked <0x00000007688f1ff0> (a java.io.BufferedInputStream) at org.smpp.TCPIPConnection.receive(TCPIPConnection.java:413) at org.smpp.ReceiverBase.receivePDUFromConnection(ReceiverBase.java:197) at org.smpp.Receiver.receiveAsync(Receiver.java:351) at org.smpp.ReceiverBase.process(ReceiverBase.java:96) at org.smpp.util.ProcessingThread.run(ProcessingThread.java:199) at java.lang.Thread.run(Thread.java:722) We are not able to trace the exact reason behind this? Kindly help. We are using 16 core machine and load on the system is around 30-40 at the time of issue. We use command ss dst <ip> to find out recv-q. Recently we have been facing issues with recv-q size getting hung, were in receive buffer gets stuck at some point of time. But recvQ size is not decreasing and as a result we are losing a lot of hits from the other side, our application is not accepting any data.

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• Play framework 2.2 using Upstart 1.5 (Ubuntu 12.04)

  - by Leon Radley

  I'm trying to get Play 2.2 working with upstart. I've been running Play 2.x with upstart since it's release and it's never been a problem. But since the release of 2.2 and the change to http://www.scala-sbt.org/sbt-native-packager/ play doesn't want to start any more. Here's the config I'm using description "PlayFramework 2.2" version "2.2" env APP=myapp env USER=myuser env GROUP=www-data env HOME=/home/myuser/app env PORT=9000 env ADDRESS=127.0.0.1 env CONFIG=production.conf env JAVAOPTS="-J-Xms128M -J-Xmx512m -J-server" start on runlevel [2345] stop on runlevel [06] respawn respawn limit 10 5 expect daemon # If you want the upstart script to build play with sbt pre-start script chdir $HOME sbt clean compile stage -mem $SBTMEM end script exec start-stop-daemon --pidfile ${HOME}/RUNNING_PID --chuid $USER:$GROUP --exec ${HOME}/bin/${APP} --background --start -- -Dconfig.resource=$CONFIG -Dhttp.address=$ADDRESS -Dhttp.port=$PORT $JAVAOPTS I've changed the JAVAOPTS to include the -J- and I've also changed the path to use the new startscript located in the /bin/ dir. I've read that upstart 1.4 has setuid and setguid. I've tried removing the start-stop-daemon but I haven't got that working either. Any suggestions would be appreciated.

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• Intermittently uncommunicative subnets

  - by mhd

  Last week proved me a veritable Cassandra: I've always said that it's a bad idea to have only one firewall/router, without a backup or failover. And thus our Cisco PIX went haywire, refusing to route properly. And of course, the only one available here on short notice is me, and while I'm quite grounded in Linux, I'm really a developer not a sysadmin (the fact that this hit me on sysadmin appreciation day is a bit ironic). Anyway, this weekend I tried to hack up a temporary solution: I used an old server with enough NICs (two built-in, four on a card) to serve as a gateway and firewall. Due to some problems with the raid controller, I got only two router distros running, and between Untangle and Ebox I decided for the latter. Now everything is quite okay. I've got all the different subnets we've got here (all with separate switches) talking to each other and even to the internet (Cisco 2800 router, T1 lines). But from time to time (20-60 minute intervals), I get a total routing failure. Our main, office subnet can't talk to our server subnet and can't connect to the internet. This is not the end of a gradual slowdown, either everything's working perfectly or I get a total lack of communication for about two minutes each time. Now I'm a bit at wits end what to check. At least with the default EBox setup, nothing in /var/log shows anything weird and it doesn't exactly have lots of built-in monitoring tools. So I'm hoping someone here could give me some pointers about what to look out for. I did change the ethernet cable from the office switch to the firewall, with no results. I might change switches, although within the switch it seems to work ok enough. Edit: I'm not sure whether this is the sole cause of the problem, but after I noticed a few DHCP entries just before the last drop of connectivity, I tried to reproduce that. And alas, whenever I renew a DHCP connection, I can't access other subnets anymore. Running ISC DHCPD 3.0.6.

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• IP tables blocking access to most hosts but some accesses being logged

  - by epo

  What am I getting wrong? A while back I locked down my web hosting service while hardening it or at least trying to. Apache listens on port 80 only and I set up iptables using the following: IPS="list of IPs" iptables --new-chain webtest # Accept all established connections iptables -A INPUT --protocol tcp --dport 80 --jump webtest iptables -A INPUT --match state --state ESTABLISHED,RELATED --jump ACCEPT iptables -A webtest --match state --state ESTABLISHED,RELATED --jump ACCEPT for ip in $IPS; do iptables -A webtest --match state --state NEW --source $ip --jump ACCEPT done iptables -A webtest --jump DROP However looking at my apache logs I notice various log entries in access_log, e.g. 221.192.199.35 - - [16/May/2010:13:04:31 +0100] "GET http://www.wantsfly.com/prx2.php?hash=926DE27C156B40E55E4CFC8F005053E2D81E6D688AF0 HTTP/1.0" 404 206 "-" "Mozilla/ 4.0 (compatible; MSIE 6.0; Windows NT 5.0)" 201.228.144.124 - - [16/May/2010:11:54:16 +0100] "GET /w00tw00t.at.ISC.SANS.DFind:) HTTP/1.1" 400 226 "-" "-" 207.46.195.224 - - [16/May/2010:04:06:48 +0100] "GET /robots.txt HTTP/1.1" 200 311 "-" "msnbot/2.0b (+http://search.msn.com/msnbot.htm)" How are these slipping through? I don't mind the indexing bots (though I am a little surprised to see them get through). I suppose they must be getting through using the ESTABLISHED,RELATED rules. And no, I can't for the life of me remember why the first match state rule is there So 2 questions: is there a better way to set up iptables to restrict access to specified hosts? How exactly are these 3 examples slipping through?

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• Doing arithmetic and passing it to the next command

  - by neurolysis

  I know how to do this in /bin/sh, but I'm struggling a bit in Windows. I know you can do arithmetic on 32-bit signed integers with SET /a 2+2 4 But how do I pass this to the next command? For example, the process I want to perform is as follows. Consumer editions of Windows have no native automated sleep function (I believe?) -- the best way to perform a sleep is to use PING in association with the -n switch to get that many seconds, minus one, of sleep. The following command is effective for a silent sleep: PING localhost -n 3 > NUL But I want to alias this into a sleep command. I'd like to have it elegant so that you enter the actual number of seconds you want to sleep after the command, right now I can do DOSKEY SLEEP=PING 127.0.0.1 -n $1 > NUL Which works, but it's always 1 second less than your input, so if you wanted to sleep for one second you would have to use the command SLEEP 2. That's not exactly ideal. Is there some way for me to pass the arithmetic of $1+1 and pass it on to the next command in Windows? I assume there is some way of using STDOUT...

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• How can I make IPv6 on OpenVPN work using a tap device?

  - by Lekensteyn

  I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 server side (set as gateway on client) 2001:db8::100:abc:2 tap0 client side 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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• Strange sound behavior

  - by caarlos0

  First of all, sorry for the tittle. English isn't my native language, and I can't find a word to describe the strange behavior I'm getting here. In the most simple explanation, is like sound keeps going down and up again... Think in a kid with that old radios that have a circled volume button. Think like these kid keeps "turning" the volume button. That is the behavior I'm getting here. At first, I believed that it was a pulseaudio issue, but, it isn't. I followed the wiki part I think that should be my problem, but it didn't work. After that, as I'm using XFCE, I didn't really need pulseaudio, so I removed it and stays with a clean alsa, hopping that will fix my problem. Sweet mistake. It really looks like a kid looking for trouble. I believed it worked, and, suddenly, here is the same issue again. BTW: I have a full-upgraded testing system (yeah, I upgraded to testing hopping for new pulseaudio version which fix the issue), no pulseaudio at all, just xfce, started with startxfce. What can I do to fix this? It's extremely annoying... sometimes I just want to throw my laptop in the wall because of this. Any extra info you need, please, tell me. Thanks in advance -- EDIT: My alsamixer is like this: And here is a video with the sound behavior.

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• Can I boot up a virtual machine natively?

  - by Anshul

  My question is: Is is possible to run a virtual machine natively on your hardware if you have installed the proper drivers etc? In other words, can I use a VHD as a regular hard drive to boot from? The reason I want to do this is that I do both graphics-intensive and audio-intensive work, but my computer is not powerful enough to handle both at the same time and many times I install a bunch of audio programs that I don't want affecting the stability of my graphics programs. Basically I wanted to have sandboxing between the two sets of applications. So I tried running the graphics-intensive programs in a VirtualBox VM and the audio-intensive work natively (simply because it's a pain to route ASIO audio devices in/out of VirtualBox). This kind-of works - the graphics-intensive stuff is tolerable, but still relatively slow, because it's running inside a VM. So my next idea was to just dual-boot and install the graphics and audio programs in separate partitions but I frequently use them in tandem, so it wouldn't be practical to reboot my machine every time I need to use the other set of programs. But I could live with this scenario: If I need to do more audio-intensive stuff, I'll just boot up to the audio partition and run the graphics programs in a VM, and then when I'm working heavily on the graphics part, I'll just boot the graphics partition as a regular OS directly on the hardware. Is this possible? For example by booting up a VHD as a regular hard drive? Or by setting up dual-boot, and every time the audio partition is shut down, synchronize the graphics VM VHD with the native graphics partition? Is it practical, given the above scenario? And if it's not possible, barring buying another computer, can anyone suggest a best-of-all-worlds setup (the two worlds being performance, sandboxing, and running in parallel) for the above scenario? Thanks in advance.

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• Server 2003 and XP Client; Why are HTTP connections being silently dropped.

  - by Asa Yeamans

  On my network, my edge-router, a windows 2003 r2 server router with all the latest updates, will drop packets, but only under specific circumstances. I have troubleshot and isolated it down to the most simple configuration i can. There is NO NAT involved. Only fully-public IP addresses. No Firewalls are running either, all ahve been disabled. no packet filters on any interfaces anywhere either. I have a single Windows XP virtual machine and my edge-router(the windows 2003 r2 server, and also a virtual machine) running on a windows 2008 x64 r2 system (running virtual server 2005 as i dont have Intel-VT compatible chip yet). The edge router can access any external http site just fine, no issues. However the windows XP machine is only able to access certain sites. These work: www.google.com www.txstate.edu www.workintexas.com www.thedailywtf.com . These Dont: www.yahoo.com www.utexas.edu en.wikipedia.org slashdot.org www.bing.com. I have removed all possibility of DNS issues by connecting with net-cat from the XP box and sending GET /\r\nHost: \r\n\r\n and that connection replicates the issue as well. The network setup: My statically assigned IP block: x.x.x.168/29 DSL Modem -----PPPoE Connection---- x.x.x.169[EdgeRouter] [EdgeRouter]x.x.x.170 -----Virtual Ethernet----- x.x.x.174 [Test2] Test2's Default gateway is x.x.x.170 and test2 can ping any and every valid, accessible, public IP address with no packet loss what-so-ever. If i connect directly over PPPoE from test2 (the XP box) everything works just fine... Im at my wits end, i have NO IDEA whats causing this.

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• How can I setup OpenVPN with IPv4 and IPv6 using a tap device?

  - by Lekensteyn

  I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): 2001:db8::100:0:0/96 my assigned IPv6 range 2001:db8::100:abc:0/112 OpenVPN IPv6 range 2001:db8::100:abc:1 tap0 (on server) (set as gateway on client) 2001:db8::100:abc:2 tap0 (on client) 2001:db8::1:2:3:4 gateway for server Home laptop (tap0: 2001:db8::100:abc:2/112 gateway 2001:db8::100:abc:1/112) | | | (running Kubuntu 10.10; OpenVPN 2.1.0-3ubuntu1) | wifi | | router | | OpenVPN INTERNET | eth0 | /tap0 VPS (eth0:2001:db8::1:2:3:4/64 gateway 2001:db8::1) (tap0: 2001:db8::100:abc:1/112) (running Debian 6; OpenVPN 2.1.3-2) The server has both native IPv4 and IPv6 connectivity, the client has only IPv4. I can ping6 to and from my server over OpenVPN, but not to other machines (for example, ipv6.google.com). net.ipv6.conf.all.forwarding is set to 1, I've tried disabling net.ipv6.conf.all.accept_ra as well, without luck. Using tcpdump on both the server and client, I can see that packets are actually transferred over tap0 to eth0. The router (2001:db8::1) send a neighbor solicitation for the client (2001:db8::100:abc:2) to eth0 after it receives the ICMP6 echo-request. The server does not respond to that solicitation, which causes the ICMP6 echo-request not be routed to the destination. How can I make this IPv6 connection work?

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• logrotate: neither rotate nor compress empty files

  - by Andrew Tobey

  i have just set up an (r)syslog server to receive the logs of various clients, which works fine. only logrotate is still not behaving as intending. i want logrotate to create a new logfile for each day, but only to keep and store i.e. compress non-empty files. my logrotate config looks currently like this # sample configuration for logrotate being a remote server for multiple clients /var/log/syslog { rotate 3 daily missingok notifempty delaycompress compress dateext nomail postrotate reload rsyslog >/dev/null 2>&1 || true endscript } # local i.e. the system's very own logs: keep logs for a whole month /var/log/kern.log /var/log/kernel-info /var/log/auth.log /var/log/auth-info /var/log/cron.log /var/log/cron-info /var/log/daemon.log /var/log/daemon-info /var/log/mail.log /var/log/rsyslog /var/log/rsyslog-info { rotate 31 daily missingok notifempty delaycompress compress dateext nomail sharedscripts postrotate reload rsyslog >/dev/null 2>&1 || true endscript } # received i.e. logs from the clients /var/log/path-to-logs/*/* { rotate 31 daily missingok notifempty delaycompress compress dateext nomail } what i end up with is having is some sort of "summarized" files such as filename-datestampDay-Day and corresponding .gz files. What I do have are empty files, which are eventually zipped. so does the notifempty directive is in fact responsible for these DayX-DayY files, days on which really nothing happened? what would be an efficient way to drop both, empty log files and their .gz files, so that I eventually only keep logs/compressed files that truly contain data?

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• processes slow after some time of actively running

  - by Yervand Aghababyan

  i have several cron jobs running on an ubuntu machine. each one does some pretty heavy load stuff. The cron jobs are parsing files and the bigger the file the longer it takes them to parse it. The strange thing is that if i make the files too big ( like 30mb) the script kind of hangs. It starts processing them really enthusiastically but after some time (something like 5-10 minutes) the cpu usage of the process drops a lot and it gets into some "zombie" state. If prior to this the process in htop was using 70-80% of the CPU then after this drop occurs it slows down to something like 5-10%. the load average drops down as well. The status of the processes sometimes changes to D in htop, which AFAIR stands for zombie. Today i noticed the same behavior of processes of mysql when executing heavy queries (a query took something like 4 hours to execute). the cron jobs are mostly php and during their processing most of the CPU eats the php process and not mysql. so i think the issue is not with a specific language/program but with the way the processes are "managed". The only other place i've seen similar behavior was on my Amazon EC2 micro instance when after some aggressive use of CPU the CPU quota was taking effect and everything was slowing down dramatically. This is a dedicated machine running ubuntu. what may be the cause?

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• ERROR: Not enough space?

  - by dsmoljanovic

  Now this is a very unspecific question. I'm trying to figure out what this message would mean. Here is the story behind it: I'm installing Oracle enterprise manager cloud control (12c r3) on Solaris 10 (5/09). Installer opens up, i enter all needed information and at the last step click Install. It immediately crashes with only "ERROR: Not enough space" written in log and console and nothing else. Now, this could be java error or Solaris error? I'm thinking it's happening either when it starts to copy files or when it tries to launch a process that would do that. What space is it referring to? disk (have ehough), swap (also), memory (yep)... Any ideas are helpful. Edit: i found this exception in the oraInventory logs: oracle.sysman.oii.oiic.OiicInstallAPIException: Not enough space at oracle.sysman.oii.oiic.OiicAPIInstaller.initInstallSession(OiicAPIInstaller.java:2165) at oracle.sysman.oii.oiic.OiicAPIInstaller.initOUIAPISession(OiicAPIInstaller.java:790) at oracle.sysman.install.oneclick.EMGCOUIInstaller.prepareForInstall(EMGCOUIInstaller.java:676) at oracle.sysman.install.oneclick.EMGCSummaryDlgonNext$1.run(EMGCSummaryDlgonNext.java:243) at java.lang.Thread.run(Thread.java:662) at oracle.sysman.install.oneclick.EMGCSummaryDlgonNext.actionsOnClickofNext(EMGCSummaryDlgonNext.java:1067) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at oracle.sysman.install.oneclick.EMGCUtil.performonClickOfNextForClass(EMGCUtil.java:399) at oracle.sysman.install.oneclick.EMGCUtil.performPageLevelValidationsForSilentInstall(EMGCUtil.java:367) at oracle.sysman.install.oneclick.EMGCInstaller.prepareForSilentInstall(EMGCInstaller.java:1459) at oracle.sysman.install.oneclick.EMGCInstaller.main(EMGCInstaller.java:1553) disk status: bash-3.00$ df -h /tmp Filesystem size used avail capacity Mounted on swap 8.1G 2.7G 5.4G 33% /tmp bash-3.00$ df -h /u01 Filesystem size used avail capacity Mounted on / 275G 28G 244G 11% / swap: root@gs12emcc # swap -s total: 18306040k bytes allocated + 3837808k reserved = 22143848k used, 5712664k available

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• ssh many users to one home

  - by filippo

  Hiya, I want to allow some trusted users to scp files into my server (to an specific user), but I do not want to give these users a home, neither ssh login. I'm having problems to understand the correct settings of users/groups I have to create to allow this to happen. I will put an example; Having: MyUser@MyServer MyUser belongs to the group MyGroup MyUser's home will be lets say, /home/MyUser SFTPGuy1@OtherBox1 SFTPGuy2@OtherBox2 They give me their id_dsa.pub's and I add it to my authorized_keys I reckon then, I'd do in my server something like useradd -d /home/MyUser -s /bin/false SFTPGuy1 (and the same for the other..) And for the last, useradd -G MyGroup SFTPGuy1 (then again, for the other guy) I'd expect then, the SFTPGuys to be able to sftp -o IdentityFile=id_dsa MyServer and to be taken to MyUser's home... Well, this is not the case... SFTP just keeps asking me for a password. Could someone point out what am I missing? Thanks a mil, f. [EDIT: Messa in StackOverflow asked me if authorized_keys file was readable to the other users (members of MyGroup). Its an interesting point, this was my answer: Well, it wasn't (it was 700), but then I changed the permissions of the .ssh dir and the auth file to 750 though still no effect. Guess it's worth mentioning that my home dir ( /home/MyUser) is also readable for the group; most dirs being 750 and the specific folder where they'd drop files is 770. Nevertheless, about the auth file, I reckon the authentication would be performed by the local user on MyServer, isn't it? if so, I don't understand the need for other users to read it... well.. just wondering. ]

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• Would an array of SSD drives be able to succesfully substitute the system memory?

  - by Florin Mircea

  I watched a few videos trying to answer this. This video (youtube.com/watch?v=eULFf6F5Ri8) shows a bunch of guys stacking 24 SSD's reaching a peak of around 2GBps r/w. That's under the limit of the worst DDR3 in this list (memorybenchmark.net/write_ddr3_amd.html) - that shows DDR3 memory performance varying from 2.78 to 6.55 Gb per second, but that video is over 3 years old. This video (youtube.com/watch?v=27GmBzQWwP0) shows a more optimistic situation, but for PCI-E SSD drives: 5 drives peaking at around 4Gb. And this other video shows that stacking up more than 3 SSD's doesn't realistically offer a substantial added performance. This and the fact that in all benchmarks the drives act quite poorly when dealing with small files (5k file read/write averaging from 10MB to around 30-40MBps) as opposed to how native memory handles such files, seems to indicate a definite NO to this question. Also, the write life cycle is indeed limited and the drives might wear out quickly, as kindly pointed out by paddy. However, I wanted to get more opinions on this. Would it be possible to at least obtain current memory performance with SSD's in RAID 0? And if so, in what circumstances? I am assuming using this configuration with a Windows OS that has a memory pagefile resident to that stack of SSD's, thus making it very fast to work with.

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• Windows VPN always disconnects after < 3 minutes, only from my network

  - by hemp

  First, this problem has existed for almost two years. Until serverfault was born, I pretty much gave up on solving it - but now, hope is reborn! I've set up a Windows 2003 server as a domain controller and VPN server at a remote office. I am able to connect to and work over the VPN from every windows client I've tried, including XP, Vista, and Windows 7 without issue, from at least five different networks (corporate and home, domain and non.) It works fine from all of them. However, whenever I connect from clients on my home network, the connection drops (silently) after 3 minutes or less. After a short while, it will eventually tell me the connection has dropped and attempt to redial/reconnect (if I've configured the client that way.) If I reconnect, the connection will re-establish and appear to work correctly, but again will silently drop, this time after a seemingly shorter time period. These are not intermittent drops. It happens every single time, in exactly the same way. The only variable is how long the connection survives. It doesn't matter what type of traffic I send. I can sit idle, send continuous pings, RDP, transfer files, all of that at once - it makes no difference. The result is always the same. Connected for a few minutes, then silent death. Since I doubt anyone has experienced this exact situation, what steps can I take to troubleshoot my evanescing VPN?

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