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• Cannot 301 redirect with IIS URL Rewrite Module

  - by Justin

  I am trying to troubleshoot my issue with the URL Rewrite Module on IIS 7. I migrated a Wordpress blog over to BlogEngine.net. There were only about 5 entries that I wanted to use 301 redirects to the new blog, so I wanted to simply create 5 exact match redirect rules using the rewrite module. For some reason the exact match rule never seems to take effect, I always get a 404 error when the original url is navigated to. I verified that my exact match pattern matched the existing backlinks and it does. I then tried a simple test and got the same behavior, no redirection. I created a page, test.html, on my site, I then created a second page, test2.html. So my exact match pattern is: "http://www.mydomain.com/test.html" And the rule is supposed to do a 301 redirect to "http://www.mydomain.com/test2.html " The redirect never happens. I created the steps for the rule based on the instructions in this page: http://learn.iis.net/page.aspx/461/creating-rewrite-rules-for-the-url-rewrite-module/ I don't see that I left out a step. After I apply the rule I've even gone as far as doing an IISReset to make sure it would be in effect but still no luck. Any thoughts on what I might have left out? (Note: my rewrite rules dont include the " " around them but I had to add since serverfault thinks I am trying to spam the system with multiple urls.)

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• Webmin ADSL module

  - by expatcm

  I was wondering if the Webmin ADSL module is going to help me solve a problem .... but I cannot find any documentation telling me what the module does ..... Any ideas? What I am hoping is that it will solve a problem .... I am just in the process of setting up a Debian server. I will use the DHCP server as part of the Debian setup to manage the lan IP addresses. I want to turn off the external DHCP server which is part of the Linksys ADSL modem / router and use just the modem. The challenge I have is knowing what I need to do in order to get the public DNS on the eth1. When I turn off the DHCP on the modem / router not a lot happens apart from no longer being able to access the settings .......... So I am looking at this Webmin module and wondering if it is to manage the ADSL connection and find the public DNS address .... The local DHCP server is working well for the lan, I am just stuck for the external DNS.

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• IIS 7.5 FTP Service crashes after installation of Advanced Logging 1.0 Module

  - by Jeremy

  I've recently been tasked with setting up two new productions servers for an ASP.Net application. The servers sit behind a F5 Load Balancer, which in turn forwards the end users IP address forward via the standard X_Forwarded_For HTTP Header. All of the reading that I have done suggests that I need to install the IIS Advanced Logging Module in order to take advantage of the X_Forwarded_For HTTP Header. Some quick background: Both of the web servers are Windows 2008 R2 Standard (x64), with IIS 7.5 installed and configured. The FTP Role has also been installed, configured and is operational. The Issue After installing the IIS Advanced Logging module via the Web Platform Installer, I noticed the following Error in the Event Viewer: The FTP Service encountered an error trying to read configuration data from file \?\C:\Windows\system32\inetsrv\config\applicationHost.config, line number 374. The error message is: Unrecognized element 'advancedLogging' Trying to connect over FTP to either of the web servers results in a 530. I've spent 2 hours scouring Google trying to find a solution, short of uninstalling the Advanced Logging Module. As far as I can tell, there is no way to turn off Advanced Logging on a site per site basis. Help would be appreciated.

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• Ninject Kernel Scope

  - by user326502

  I'm new to Ninject, and I was wondering if the scope of the kernel should be 1 per application. So should I treat the kernel as a singleton? Thanks.

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• Limit on number of kernel arguments in OpenCL

  - by Rakesh K

  Hi, I wanted to know if there is any limit on the number of arguments that are set to kernel function in OpenCL. I am getting the error as INVALID_ARG_INDEX while setting arguments. I am setting 9 arguments in the kernel function. Please help me in this regard. Thanks, Rakesh.

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• linux kernel booting from my bootloader

  - by sp3tsnaz

  hi , i wish to load linux using my own bootloader .. preliminary research and google told me that i ll have to use start_kerne() function .. i want to ask how can i call start_kernel() from assembly .. i have already formatted my usb into ext3 and pasted the compiled kernel there .. now how can i start the linux kernel ? any help is welcome // Thankyou in advance Mohsin .

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• difference between kernel vs user mode progamming

  - by mousey

  Hi, I would like to know how kernel programmer thinks about memory vs user mode programmer. I would also like to know few more differences between kernel programming and user mode programming. Thanks & Regards, Mousey.

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• possible SYN flooding on port 80. Sending cookies

  - by Sparsh Gupta

  I recently had a server downtime. I looked everywhere and the only thing I found in my log files is: Feb 17 18:58:04 localhost kernel: possible SYN flooding on port 80. Sending cookies. Feb 17 18:59:33 localhost kernel: possible SYN flooding on port 80. Sending cookies. Can someone give me more information about it. WHat is it, How can I debug the cause and how can I fix the same. I also posted ipconntrack suddenly became toooo large which has another data point I found unusual, wondering if the two things is connected as they occured exactly at the same time but at different servers. One at reverse proxy and other at actual backend Varnish server) Thanks

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• Debian on Hyper-V

  - by Tobia

  I installed Debian with kernel 2.6.32-5-686 on a Hyper-V virtual machine. I had to add a legacy network card. I follow this tutorial http://www.microsofttranslator.com/bv.aspx?ref=Internal&from=ru&to=en&a=http://blogs.technet.com/b/abeshkov/archive/2011/03/17/hyperv_5f00_debian.aspx to add Hyper-V driver but when I reboot with the new kernel it crash during bootup. Is there any other way to load hyper-v drivers? I really need to change that legacy network card because my debian machine is going to be used as proxy. Thank you.

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• High shmmax value in Redhat 6.3

  - by xpapad

  We are using Redhat 6.3 with 30G RAM to host our Postgres server. The (default) shmmax value is 68,719,476,736 In some forums I have read that having an shmmax value larger than the RAM causes extensive paging, but in the Redhat forums it warns against changing a kernel parameter that is already configured to a value larger than the minimum requirements for an environment. In ServerFault I've read that this probably has no impact. So is there any impact of having shmmax value RAM in a DB server, or the kernel understands this and handles it appropriately? Thanks

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• Python: import the containing package

  - by guy

  In a module residing inside a package, i have the need to use a function defined within the __init__.py of that package. how can i import the package within the module that resides within the package, so i can use that function? Importing __init__ inside the module will not import the package, but instead a module named __init__, leading to two copies of things with different names... Is there a pythonic way to do this?

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• drupal jQuery 1.4 on specific pages

  - by Mark

  I'm looking for a way to force drupal to use 1.4 on specific pages. This is the same as this old question:http://stackoverflow.com/questions/2842792/drupal-jquery-1-4-on-specific-pages It look me a while to try the answer which I marked correct. But because I'm new to module dev overall I couldn't figure it out based on the answer. The code from that answer looked like this: /** * Implementation of hook_theme_registry_alter(). * Based on the jquery_update module. * * Make this page preprocess function runs *last*, * so that a theme can't call drupal_get_js(). */ function MYMODULE_theme_registry_alter(&$theme_registry) { if (isset($theme_registry['page'])) { // See if our preprocess function is loaded, if so remove it. if ($key = array_search('MYMODULE_preprocess_page', $theme_registry['page']['preprocess functions'])) { unset($theme_registry['page']['preprocess functions'][$key]); } // Now add it on at the end of the array so that it runs last. $theme_registry['page']['preprocess functions'][] = 'MYMODULE_preprocess_page'; } } /** * Implementation of moduleName_preprocess_hook(). * Based on the jquery_update module functions. * * Strips out JS and CSS for a path. */ function MYMODULE_preprocess_page(&$variables, $arg = 'my_page', $delta=0) { // I needed a one hit wonder. Can be altered to use function arguments // to increase it's flexibility. if(arg($delta) == $arg) { $scripts = drupal_add_js(); $css = drupal_add_css(); // Only do this for pages that have JavaScript on them. if (!empty($variables['scripts'])) { $path = drupal_get_path('module', 'admin_menu'); unset($scripts['module'][$path . '/admin_menu.js']); $variables['scripts'] = drupal_get_js('header', $scripts); } // Similar process for CSS but there are 2 Css realted variables. // $variables['css'] and $variables['styles'] are both used. if (!empty($variables['css'])) { $path = drupal_get_path('module', 'admin_menu'); unset($css['all']['module'][$path . '/admin_menu.css']); unset($css['all']['module'][$path . '/admin_menu.color.css']); $variables['styles'] = drupal_get_css($css); } } } I need the jquery_update 1.3.2 to be unset on the node-types of 'blog' and 'video'. Can someone help me out? Thank you.

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• Linux Kernel Packet Forwarding Performance

  - by Bob Somers

  I've been using a Linux box as a router for some time now. Nothing too fancy, just enabling forwarding in the kernel, turning on masquerading, and setting up iptables to poke a few holes in the firewall. Recently a friend of mine pointed out a performance problem. Single TCP connections seem to experience very poor performance. You have to open multiple parallel TCP connections to get decent speed. For example, I have a 10 Mbit internet connection. When I download a file from a known-fast source using something like the DownThemAll! extension for Firefox (which opens multiple parallel TCP connections) I can get it to max out my downstream bandwidth at around 1 MB/s. However, when I download the same file using the built-in download manager in Firefox (uses only a single TCP connection) it starts fast and the speed tanks until it tops out around 100 KB/s to 350 KB/s. I've checked the internal network and it doesn't seem to have any problems. Everything goes through a 100 Mbit switch. I've also run iperf both internally (from the router to my desktop) and externally (from my desktop to a Linux box I own out on the net) and haven't seen any problems. It tops out around 1 MB/s like it should. Speedtest.net also reports 10 Mbits speeds. The load on the Linux machine is around 0.00, 0.00, 0.00 all the time, and it's got plenty of free RAM. It's an older laptop with a Pentium M 1.6 GHz processor and 1 GB of RAM. The internal network is connected to the built in Intel NIC and the cable modem is connected to a Netgear FA511 32-bit PCMCIA network card. I think the problem is with the packet forwarding in the router, but I honestly am not sure where the problem could be. Is there anything that would substantially slow down a single TCP stream?

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• RHEL 5.2 installing on ProLiant BL460c - hangs at 'now booting the kernel'

  - by Dr Rocket Mr Socket

  As the title states, I have a problem. This server and the installation disc are also on the other side of the world to me so... So far, I have tried to start the install with the parameters: linux text noapic noacpi no=apic no=acpi which results in the same hang. I have also disabled a PCI ethernet adapter, I am uneasy about disabling the onboard ethernet adapter I do not know if ILO uses this. Anyone have any advice? Much appreciated. EDIT: full output after trying to begin the installation. boot: linux text Loading initrd.img.................. Loading vmlinuz....... Uncompressing Linux...done. Now booting the kernel stays on this for hours EDIT2: adding the 'mem=40960M' (server has 40 gigs of ram) parameter allows it to proceed but the following output directly after 'Now booting the kernal' Memory: sized by int13 0e801h initrd extends beyond end of memory (0x00ef2090 > 0x00000000) disabling initrd Console: 16 point font, 400 scans Console: colour VGA+ 80x25, 1 virtual console (max 63) pcibios_init : BIOS32 Service Directory Structure at 0x000ffee0 pcibios_init : BIOS32 Service Directory entry at 0xf0000

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• LightDM will not start after stopping it

  - by Sweeters

  I am running Ubuntu 11.10 "Oneiric Ocelot", and in trying to install the nvidia CUDA developer drivers I switched to a virtual terminal (Ctrl-Alt-F5) and stopped lightdm (installation required that no X server instance be running) through sudo service lightdm stop. Re-starting lightdm with sudo service lightdm start did not work: A couple of * Starting [...] lines where displayed, but the process hanged. (I do not remember at which point, but I think it was * Starting System V runlevel compatibility. I manually rebooted my laptop, and ever since booting seems to hang, usually around the * Starting anac(h)ronistic cron [OK] log line (not consistently at that point, though). From that point on, I seem to be able to interact with my system only through a tty session (Ctrl-Alt-F1). I've tried purging and reinstalling both lightdm and gdm, as well as selecting both as the default display managers (through sudo dpkg-reconfigure [lightdm / gdm] or by manually editing /etc/X11/default-display-manager) through both apt-get and aptitude (that shouldn't make a difference anyway) after updating the packages, but the problem persists. Some of the responses I'm getting are the following: After running sudo dpkg-reconfigure lightdm (but not ... gdm) I get the following message: dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_NAME missing dpkg-maintscript-helper:warning: environment variable DPKG_MATINSCRIPT_PACKAGE missing After trying sudo service lightdm start or sudo start lightdm I get to see the boot loading screen again but nothing changes. If I go back to the tty shell I see lightdm start/running, process <num> but ps -e | grep lightdm gives no output. After trying sudo service gdm start or sudo starg gdm I get the gdm start/running, process <num> message, and gdm-binary is supposedly an active process, but all that happens is that the screen blinks a couple of times and nothing else. Other candidate solutions that I'd found on the web included running startx but when I try that I get an error output [...] Fatal server error: no screens found [...]. Moreover, I made sure that lightdm-gtk-greeter is installed but that did not help either. Please excuse my not including complete outputs/logs; I am writing this post from another computer and it's hard to manually copy the complete logs. Also, I've seen several posts that had to do with similar problems, but either there was no fix, or the one suggested did not work for me. In closing: Please help! I very much hope to avoid re-installing Ubuntu from scratch! :) Alex @mosi I did not manage to fix the NVIDIA kernel driver as per your instructions. I should perhaps mention that I'm on a Dell XPS15 laptop with an NVIDIA Optimus graphics card, and that I have bumblebee installed (which installs nvidia drivers during its installation, I believe). Issuing the mentioned commands I get the following: ~$uname -r 3.0.0-12-generic ~$lsmod | grep -i nvidia nvidia 11713772 0 ~$dmesg | grep -i nvidia [ 8.980041] nvidia: module license 'NVIDIA' taints kernel. [ 9.354860] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354864] nvidia 0000:01:00.0: power state changed by ACPI to D0 [ 9.354868] nvidia 0000:01:00.0: enabling device (0006 -> 0007) [ 9.354873] nvidia 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 [ 9.354879] nvidia 0000:01:00.0: setting latency timer to 64 [ 9.355052] NVRM: loading NVIDIA UNIX x86_64 Kernel Module 280.13 Wed Jul 27 16:53:56 PDT 2011 Also, running aptitude search nvidia gives me the following: p nvidia-173 - NVIDIA binary Xorg driver, kernel module a p nvidia-173-dev - NVIDIA binary Xorg driver development file p nvidia-173-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-173-updates-dev - NVIDIA binary Xorg driver development file p nvidia-96 - NVIDIA binary Xorg driver, kernel module a p nvidia-96-dev - NVIDIA binary Xorg driver development file p nvidia-96-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-96-updates-dev - NVIDIA binary Xorg driver development file p nvidia-cg-toolkit - Cg Toolkit - GPU Shader Authoring Language p nvidia-common - Find obsolete NVIDIA drivers i nvidia-current - NVIDIA binary Xorg driver, kernel module a p nvidia-current-dev - NVIDIA binary Xorg driver development file c nvidia-current-updates - NVIDIA binary Xorg driver, kernel module a p nvidia-current-updates-dev - NVIDIA binary Xorg driver development file i nvidia-settings - Tool of configuring the NVIDIA graphics dr p nvidia-settings-updates - Tool of configuring the NVIDIA graphics dr v nvidia-va-driver - v nvidia-va-driver - I've tried manually installing (sudo aptitude install <package>) packages nvidia-common and nvidia-settings-updates but to no avail. For example, sudo aptitude install nvidia-settings-updates returns the following log: Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... No packages will be installed, upgraded, or removed. 0 packages upgraded, 0 newly installed, 0 to remove and 83 not upgraded. Need to get 0 B of archives. After unpacking 0 B will be used. Writing extended state information... Reading package lists... Building dependency tree... Reading state information... Reading extended state information... Initializing package states... Writing extended state information... The same happens with the Linux headers (i.e. I cannot seem to be able to install linux-headers-3.0.0-12-generic). The output of aptitude search linux-headers is as follows: v linux-headers - v linux-headers - v linux-headers-2.6 - i linux-headers-2.6.38-11 - Header files related to Linux kernel versi i linux-headers-2.6.38-11-generic - Linux kernel headers for version 2.6.38 on i A linux-headers-2.6.38-8 - Header files related to Linux kernel versi i A linux-headers-2.6.38-8-generic - Linux kernel headers for version 2.6.38 on v linux-headers-3 - v linux-headers-3.0 - v linux-headers-3.0 - i A linux-headers-3.0.0-12 - Header files related to Linux kernel versi p linux-headers-3.0.0-12-generic - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-generic- - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-server - Linux kernel headers for version 3.0.0 on p linux-headers-3.0.0-12-virtual - Linux kernel headers for version 3.0.0 on p linux-headers-generic - Generic Linux kernel headers p linux-headers-generic-pae - Generic Linux kernel headers v linux-headers-lbm - v linux-headers-lbm - v linux-headers-lbm-2.6 - v linux-headers-lbm-2.6 - p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-gene - Header files related to linux-backports-mo p linux-headers-lbm-3.0.0-12-serv - Header files related to linux-backports-mo p linux-headers-server - Linux kernel headers on Server Equipment. p linux-headers-virtual - Linux kernel headers for virtual machines @heartsmagic I did try purging and reinstalling any nvidia driver packages, but it did not seem to make a difference, My xorg.conf file contains the following: # nvidia-xconfig: X configuration file generated by nvidia-xconfig # nvidia-xconfig: version 280.13 ([email protected]) Wed Jul 27 17:15:58 PDT 2011 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" Identifier "Monitor0" VendorName "Unknown" ModelName "Unknown" HorizSync 28.0 - 33.0 VertRefresh 43.0 - 72.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 SubSection "Display" Depth 24 EndSubSection EndSection

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• I have UFW block messages from local network machines, how can I analyse if they are malicious?

  - by Trygve

  I'm getting a lot of messages in my UFW log, and I'm trying to figure out if these are malicious or just normal. A UDP broadcast is coming from a windows laptop x.x.x.191, and some from our synology disks x.x.x.{6,8,10,11}. I have not figured out which macine 114 is yet. I would appreciate some advice in how to read the log, and get the most I can out of these calls. Oct 18 17:03:34 <myusername> kernel: [ 4034.755221] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:06:e8:19:08:00 SRC=x.x.x.6 DST=x.x.x.169 LEN=364 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=344 Oct 18 17:03:34 <myusername> kernel: [ 4034.755292] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1b:e8:8f:08:00 SRC=x.x.x.10 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=346 Oct 18 17:03:34 <myusername> kernel: [ 4034.756444] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=294 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=274 Oct 18 17:03:34 <myusername> kernel: [ 4034.756613] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=306 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=286 Oct 18 17:03:34 <myusername> kernel: [ 4034.760416] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1e:6a:33:08:00 SRC=x.x.x.11 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=47978 LEN=346 Oct 18 17:03:36 <myusername> kernel: [ 4036.215134] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=x.x.x.169 LEN=424 TOS=0x00 PREC=0x00 TTL=128 ID=11155 PROTO=UDP SPT=1900 DPT=47978 LEN=404 Oct 18 17:04:23 <myusername> kernel: [ 4083.853710] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=652 TOS=0x00 PREC=0x00 TTL=1 ID=11247 PROTO=UDP SPT=58930 DPT=3702 LEN=632 Oct 18 17:04:24 <myusername> kernel: [ 4084.063153] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=652 TOS=0x00 PREC=0x00 TTL=1 ID=11299 PROTO=UDP SPT=58930 DPT=3702 LEN=632 Oct 18 17:07:02 <myusername> kernel: [ 4242.153947] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=18702 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:07:02 <myusername> kernel: [ 4242.275788] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=18703 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:12:29 <myusername> kernel: [ 4569.073815] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=30102 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:12:29 <myusername> kernel: [ 4569.242740] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=30103 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:17:02 <myusername> kernel: [ 4841.440729] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=9195 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:17:02 <myusername> kernel: [ 4841.553211] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=239.255.255.250 LEN=680 TOS=0x00 PREC=0x00 TTL=1 ID=9196 PROTO=UDP SPT=58930 DPT=3702 LEN=660 Oct 18 17:19:10 <myusername> kernel: [ 4969.294709] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:25:36:26:02:86:08:00 SRC=x.x.x.114 DST=239.255.255.250 LEN=923 TOS=0x00 PREC=0x00 TTL=1 ID=27103 PROTO=UDP SPT=3702 DPT=3702 LEN=903 Oct 18 17:19:10 <myusername> kernel: [ 4969.314553] [UFW BLOCK] IN=eth0 OUT= MAC=01:00:5e:7f:ff:fa:00:25:36:26:02:86:08:00 SRC=x.x.x.114 DST=239.255.255.250 LEN=923 TOS=0x00 PREC=0x00 TTL=1 ID=27104 PROTO=UDP SPT=3702 DPT=3702 LEN=903 Oct 18 17:33:34 <myusername> kernel: [ 5832.431610] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1b:e8:8f:08:00 SRC=x.x.x.10 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=346 Oct 18 17:33:34 <myusername> kernel: [ 5832.431659] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:06:e8:19:08:00 SRC=x.x.x.6 DST=x.x.x.169 LEN=364 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=344 Oct 18 17:33:34 <myusername> kernel: [ 5832.431865] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:11:32:1e:6a:33:08:00 SRC=x.x.x.11 DST=x.x.x.169 LEN=366 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=346 Oct 18 17:33:34 <myusername> kernel: [ 5832.433024] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=294 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=274 Oct 18 17:33:34 <myusername> kernel: [ 5832.433224] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:c0:c1:c0:52:18:ea:08:00 SRC=x.x.x.8 DST=x.x.x.169 LEN=306 TOS=0x00 PREC=0x00 TTL=64 ID=0 DF PROTO=UDP SPT=1900 DPT=55281 LEN=286 Oct 18 17:33:37 <myusername> kernel: [ 5834.914484] [UFW BLOCK] IN=eth0 OUT= MAC=f0:de:f1:71:c3:2e:00:22:19:de:80:a4:08:00 SRC=x.x.x.191 DST=x.x.x.169 LEN=424 TOS=0x00 PREC=0x00 TTL=128 ID=10075 PROTO=UDP SPT=1900 DPT=55281 LEN=404

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• PC to USB transfer slow

  - by Vipin Ms

  I'm having trouble with USB transfer,not with external hard disk. Transfer starts with like, for the transfer of 700MB file it starts with 30mb/s and towards the end it stops at 0s and stays put for like 3-4 mins to transfer the last bit. I have tried different USB devices, but no luck. Is it a bug? Another important point is, in Kubuntu there is no such issue. So is it something related to Gnome? I'm using Ubuntu 11.10 64bit. Somebody please help, it's really annoying. Here are the details. PC all of my drives are in ext4. USB I tried ext3,ntfs and fat32. All having the same problem. Here are my USB controllers details: root@LAB:~# lspci|grep USB 00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03) 00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03) 00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03) 00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03) 00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03) 00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) Here is an example of one transfer. I connected one of my 4GB usb device. Nov 24 12:01:25 LAB kernel: [ 1175.082175] userif-2: sent link up event. Nov 24 12:01:25 LAB kernel: [ 1695.684158] usb 2-2: new high speed USB device number 3 using ehci_hcd Nov 24 12:01:25 LAB mtp-probe: checking bus 2, device 3: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-2" Nov 24 12:01:26 LAB mtp-probe: bus: 2, device: 3 was not an MTP device Nov 24 12:01:26 LAB kernel: [ 1696.132680] usbcore: registered new interface driver uas Nov 24 12:01:26 LAB kernel: [ 1696.142528] Initializing USB Mass Storage driver... Nov 24 12:01:26 LAB kernel: [ 1696.142919] scsi4 : usb-storage 2-2:1.0 Nov 24 12:01:26 LAB kernel: [ 1696.143146] usbcore: registered new interface driver usb-storage Nov 24 12:01:26 LAB kernel: [ 1696.143150] USB Mass Storage support registered. Nov 24 12:01:27 LAB kernel: [ 1697.141657] scsi 4:0:0:0: Direct-Access SanDisk U3 Cruzer Micro 8.02 PQ: 0 ANSI: 0 CCS Nov 24 12:01:27 LAB kernel: [ 1697.168827] sd 4:0:0:0: Attached scsi generic sg2 type 0 Nov 24 12:01:27 LAB kernel: [ 1697.169262] sd 4:0:0:0: [sdb] 7856127 512-byte logical blocks: (4.02 GB/3.74 GiB) Nov 24 12:01:27 LAB kernel: [ 1697.169762] sd 4:0:0:0: [sdb] Write Protect is off Nov 24 12:01:27 LAB kernel: [ 1697.169767] sd 4:0:0:0: [sdb] Mode Sense: 45 00 00 08 Nov 24 12:01:27 LAB kernel: [ 1697.171386] sd 4:0:0:0: [sdb] No Caching mode page present Nov 24 12:01:27 LAB kernel: [ 1697.171391] sd 4:0:0:0: [sdb] Assuming drive cache: write through Nov 24 12:01:27 LAB kernel: [ 1697.173503] sd 4:0:0:0: [sdb] No Caching mode page present Nov 24 12:01:27 LAB kernel: [ 1697.173510] sd 4:0:0:0: [sdb] Assuming drive cache: write through Nov 24 12:01:27 LAB kernel: [ 1697.175337] sdb: sdb1 After that I initiated one transfer. lsof -p 3575|tail -2 mv 3575 root 3r REG 8,8 1719599104 4325379 /media/Misc/The Tree of Life (2011) DVDRip XviD-MAXSPEED/The Tree of Life (2011) DVDRip XviD-MAXSPEED www.torentz.3xforum.ro.avi mv 3575 root 4w REG 8,17 1046347776 15 /media/SREE/The Tree of Life (2011) DVDRip XviD-MAXSPEED/The Tree of Life (2011) DVDRip XviD-MAXSPEED www.torentz.3xforum.ro.avi Here are the total time spent on that transfer. root@LAB:/media/SREE# time mv /media/Misc/The\ Tree\ of\ Life\ \(2011\)\ DVDRip\ XviD-MAXSPEED/ /media/SREE/ real 11m49.334s user 0m0.008s sys 0m5.260s root@LAB:/media/SREE# df -T|tail -2 /dev/sdb1 vfat 3918344 1679308 2239036 43% /media/SREE /dev/sda8 ext4 110110576 60096904 50013672 55% /media/Misc Do you think this is normal?? Approximately 12 minutes for 1.6Gb transfer? Thanks.

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• Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) after apt-get upgrade

  - by Edward

  I'm using Ubuntu 9.1 server edition, I get this error during boot time after I ran sudo apt-get upgrade when checking my kernel version, uname -r returns 2.6.31-14-generic but when i run dpkg -l 'linux-image*' | grep ^.i I cannot find 2.6.31-14 (only contains 2.6.32*) Following the solution in the thread: Kernel Panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) doesn't work for me I'm running the commands inside the Rescue mode by booting from the Ubuntu 9.1 Installation Disc Do I need to update my kernel and run update-initramfs + update-grub again? If so, how can I update the kernel? apt-get install any linux-headers/image cannot change the uname -r value Thanks!

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• Can realtek 8192cu usb wireless card be used in ubuntu 12.04 with kernel 3.2.0?

  - by waterloo2005

  I do like the post RTL8188CUS Wireless USB Dongle doesn't work unless I disable wireless security . But when I plug my 8192cu usb wireless card, my computer screen is off. At that time I even can not use Alt SysRq k or Alt SysRq + reisub. I compile the latest driver of 8192cu on ubuntu 12.04 with kernel 3.2.0-34. In RealTek site, I download 8192cu drive which is for Linux Kernel 2.6.18~2.6.38 and Kernel 3.0.8. But now in Ubuntu12.04 my kernel is 3.2.0-34. Every time I plug the usb 8192cu wireless card my system halts. Now I try to blacklist both the system's rtl8192cu driver and the new 8192cu driver I compile, but the system still halts when I plug the usb driver. What about you ? Thanks!

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• Flush kernel's TCP buffer with `MSG_MORE`-flagged packets

  - by timn

  send()'s man page reveals the MSG_MORE flag which is asserted to act like TCP_CORK. I have a wrapper function around send(): int SocketConnection_Write(SocketConnection *this, void *buf, int len) { errno = 0; int sent = send(this->fd, buf, len, MSG_NOSIGNAL); if (errno == EPIPE || errno == ENOTCONN) { throw(exc, &SocketConnection_NotConnectedException); } else if (errno == ECONNRESET) { throw(exc, &SocketConnection_ConnectionResetException); } else if (sent != len) { throw(exc, &SocketConnection_LengthMismatchException); } return sent; } Assuming I want to use the kernel buffer, I could go with TCP_CORK, enable whenever it is necessary and then disable it to flush the buffer. But on the other hand, thereby the need for an additional system call arises. Thus, the usage of MSG_MORE seems more appropriate to me. I'd simply change the above send() line to: int sent = send(this->fd, buf, len, MSG_NOSIGNAL | MSG_MORE); According to lwm.net, packets will be flushed automatically if they are large enough: If an application sets that option on a socket, the kernel will not send out short packets. Instead, it will wait until enough data has shown up to fill a maximum-size packet, then send it. When TCP_CORK is turned off, any remaining data will go out on the wire. But this section only refers to TCP_CORK. Now, what is the proper way to flush MSG_MORE packets? I can only think of two possibilities: Call send() with an empty buffer and without MSG_MORE being set Re-apply the TCP_CORK option as described on this page Unfortunately the whole topic is very poorly documented and I couldn't find much on the Internet. I am also wondering how to check that everything works as expected? Obviously running the server through strace' is not an option. So the only simplest way would be to usenetcat' and then look at its `strace' output? Or will the kernel handle traffic differently transmitted over a loopback interface?

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• My kernel only works in block (0,0)

  - by ZeroDivide

  I am trying to write a simple matrixMultiplication application that multiplies two square matrices using CUDA. I am having a problem where my kernel is only computing correctly in block (0,0) of the grid. This is my invocation code: dim3 dimBlock(4,4,1); dim3 dimGrid(4,4,1); //Launch the kernel; MatrixMulKernel<<<dimGrid,dimBlock>>>(Md,Nd,Pd,Width); This is my Kernel function __global__ void MatrixMulKernel(int* Md, int* Nd, int* Pd, int Width) { const int tx = threadIdx.x; const int ty = threadIdx.y; const int bx = blockIdx.x; const int by = blockIdx.y; const int row = (by * blockDim.y + ty); const int col = (bx * blockDim.x + tx); //Pvalue stores the Pd element that is computed by the thread int Pvalue = 0; for (int k = 0; k < Width; k++) { Pvalue += Md[row * Width + k] * Nd[k * Width + col]; } __syncthreads(); //Write the matrix to device memory each thread writes one element Pd[row * Width + col] = Pvalue; } I think the problem may have something to do with memory but I'm a bit lost. What should I do to make this code work across several blocks?

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• iotop for Linux kernel 2.6.18

  - by Lightsauce

  So it has to come to my attention that iotop isn't availalbe for 2.6.18 since it's less than 2.6.20 and requires Python 2.6+. I've done some research and came across this article: http://lserinol.blogspot.com/2009/09/io-usage-per-process-on-linux.html According to this, if these process have io stats in /proc/pid#/io (where pid# is the process #) it's doable regardless of the kernel version. So, in reality, I could upgrade Python to 2.6 and test out iotop. However, my flavor of Linux, CentOS release 5.5 (Final), only supports Python 2.4.3-44.el5 currently. If I were to do uninstall from yum, it doesn't look so pretty. It ends up wanting to uninstall 235 packages, most of which are very important! I read in one place, online (I forget the URL from yesterday), that you can install Python 2.6+ parallel to this one, and have the rpm install for iotop use that. Well, I didn't choose that route. I figured, what the heck, lets write iotop (not copying it, but reverse engineering it without actually looking at it's code/it in use) in bash. I thought it would just grab the /proc/pid#/io file and parse stats. So I wrote a script to grab the top 10 rchar, wchar, read_bytes, and write_bytes by collecting all these stats from all the /proc/pid#/io files, sorting them by each metric, then grabbing the top 10 highest values. The conclusion, the data seems completely useless. Does anybody know any resources for advanced Linux where I can figure out how to take these /proc/pid#/ directories and figure out what the heck they are doing with io on the disk? My main goal is to figure out what exactly is causing high load on my disk. I just know it's on the / partition (/dev/sda2 in this case), and I'm not really sure how to narrow it down without the help of iotop. If I run iostat to grab metrics for 1 minute, every second, the first result it gives me shows a high 'kB_read/s', so that makes me think, it's reading mostly. However, if I watch the update it gives me every second, it's actually just showing values for kB_wrtn/s. This makes me think the initial value iostat gives me is misleading.

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• Powershell import-module webadministration

  - by David

  Every time I execute this command invoke-command -computername REMOTEPC -scriptblock { import-module WebAdministration; new-item "$env:systemdrive\inetpub\testsite" -type directory; New-WebSite -Name TestSite -Port 81 -PhysicalPath "$env:systemdrive\inetpub\testsite" } I get the following error Invalid class string (Exception from HRESULT: 0x800401F3 (CO_E_CLASSSTRING)) + CategoryInfo : NotSpecified: (:) [Get-ChildItem], COMException + FullyQualifiedErrorId : System.Runtime.InteropServices.COMException,Microsoft.PowerShell.Commands.GetChildItemCommand The website is created successfully as far as I can see. The following command gives the same error when enumerating the testsite Invoke-Command -computername REMOTEPC { import-module webadministration; dir -path IIS:\Sites\ } Name ID State Physical Path Bindings PSComputerName Default Web Site 1 Started http *:80: REMOTEPC Invalid class string (Exception from HRESULT: 0x800401F3 (CO_E_CLASSSTRING)) + CategoryInfo : NotSpecified: (:) [Get-ChildItem], COMException + FullyQualifiedErrorId : System.Runtime.InteropServices.COMException,Microsoft.PowerShell.Commands.GetChildItemCo mmand Any suggestions would be appreciated

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• CEF3 application crash: Fault Module KERNELBASE.DLL

  - by Asadullah Laghari

  I am using CEF3 in Delphi XE3. Application crashes as soon as I launch it. It gives following details **Problem Event Name: APPCRASH Application Name: Project4.exe Application Version: 1.0.0.0 Application Timestamp: 50c4062d Fault Module Name: KERNELBASE.dll Fault Module Version: 6.2.9200.16384 Fault Module Timestamp: 5010acfa Exception Code: 0eedfade Exception Offset: 0001277c OS Version: 6.2.9200.2.0.0.256.48 Locale ID: 1033** Can anyone help me out plz??

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• 'skb rides the rocket' on Xen VM

  - by Kye

  I've just set up Ubuntu 13.10 server as a VM on my Ubuntu/Xen server, and I'm getting these weird lines in my syslog. Nov 12 10:26:32 human kernel: [130782.315333] xennet: skb rides the rocket: 19 slots Nov 12 10:26:32 human kernel: [130782.362405] xennet: skb rides the rocket: 20 slots Nov 12 10:26:32 human kernel: [130782.408458] xennet: skb rides the rocket: 19 slots Nov 12 10:26:32 human kernel: [130782.490260] xennet: skb rides the rocket: 20 slots Nov 12 10:26:32 human kernel: [130782.541931] xennet: skb rides the rocket: 19 slots Nov 12 10:26:35 human kernel: [130785.226635] xennet: skb rides the rocket: 19 slots Nov 12 10:26:35 human kernel: [130785.261026] xennet: skb rides the rocket: 21 slots Nov 12 10:26:35 human kernel: [130785.469306] xennet: skb rides the rocket: 19 slots Nov 12 10:26:36 human kernel: [130786.552730] xennet: skb rides the rocket: 21 slots Nov 12 10:26:38 human kernel: [130788.212747] xennet: skb rides the rocket: 20 slots Nov 12 10:26:38 human kernel: [130788.257544] xennet: skb rides the rocket: 19 slots Nov 12 10:26:38 human kernel: [130788.903841] xennet: skb rides the rocket: 19 slots Unsure of what they mean, and Google has nothing meaningful. Any help is appreciated.

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