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• LAMP Server: (104) Connection reset by peer

  - by StephenM

  A user reported the following problem when attempting to visit www.airlinemogul.com. The requested URL could not be retrieved While trying to retrieve the URL: http://www.airlinemogul.com/airlinemogul/index.php The following error was encountered: * Read Error The system returned: (104) Connection reset by peer An error condition occurred while reading data from the network. Please retry your request. There are no other issues reported by any other users, so it may be an isolated issue. Could anyone give me any suggestions as to how I could investigate the problem further or find a solution? Thanks.

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• Where is a good place to start to learn about custom caching in .Net

  - by John

  I'm looking to make some performance enhancements to our site, but I'm not sure exactly where to begin. We have some custom object caching, but I think that we can do better. Our Business We aggregate news stories on a news type of web site. We get approximately 500-1000 new stories per week. We have index pages that show various lists of the items and details pages that show the individual stories. Our Current Use case: Getting an Individual Story User makes a request The Data Access Layer(DAL) checks to see if the item is in cache and if item is fresh (15 minutes). If the item is not in cache or is not fresh, retrieve the item from SQL Server, save to cache and return to user. Problems with this approach The pull nature of caching means that users have to pay the waiting cost every time that the cache is refreshed. Once a story is published, it changes infrequently and I think that we should replace the pull model with something better. My initial thoughts My initial thought is that stories should ALL be stored locally in some type of dictionary. (Cache or is there another, better way?). If the story is not found, then make a trip to the database, update the local dictionary and send the item back. Since there may be occasional updates to stories, this should be an entirely process from the user. I watched a video by Brent Ozar, How StackOverflow Scales SQL Server, in which Brent states "the fastest database query is the one that you don't make". Where do I start? At this point, I don't know exactly what the solution is. Is it caching? Is there a better way of using local storage? Do I use a Dictionary, OrderedDictionary, List ? It seems daunting and I'm just looking for some good starting points to learn more about how to do this type of optimization.

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• Apache 2.2 Windows XP Uninstall Doesn't Remove All Files

  - by AJ

  Hello, I am trying to uninstall Apache 2.2 on Windows XP. The original installation was from the binary msi distribution. The uninstall function of the msi ran successfully, but it failed to remove a couple of folders: C:\Apache2.2\conf C:\Apache2.2\logs I am unable to remove these folders manually because they contain files for which I do not have ownership. And this is the source of my confusion: why if I installed the program do I not have permission to remove it? To be clear, I do not have local admin rights (nor can I request them), yet the files in these two remaining folders are owned by Administrator. How is it that Administrator created these files (and how can I possibly remove them)? Thanks, -aj

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• VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router

  - by Hugo Garcia

  I have the following scenario: EX2200 Switch whit ge-0/0/6 set as an access port on VLAN 80 ge-0/0/0 set as a trunk port connected to a catalyst switch and various vlans allowed to pass includin vlan 80 On the Catalyst Switch. port #3 set up as a trunk port that receives traffic from the EX switch. port 46 is set up also as a trunk port that connects to a cisco router. Port #48 is where the host used to be connected host - EX2200 - Catalyst - Router the problem is that this EX2200 is a new addition to the network and the host connected previosly to the catalyst switch. traffic is not getting from the host to the router, but the router can send ARP request to the host. following is the relevant configuration: Catalyst Switch: interface GigabitEthernet1/46 switchport trunk encapsulation dot1q switchport trunk allowed vlan 80,82,83,93,289 switchport mode trunk mtu 1532 media-type rj45 speed 1000 duplex full arp timeout 300 ! interface GigabitEthernet1/48 switchport access vlan 80 switchport mode access mtu 1532 media-type rj45 speed 100 duplex full arp timeout 300 no cdp enable ! EX2200 Switch:

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• Creating an office network and monitoring all activity without a proxy

  - by Robert

  We are setting up our office network and would like to track all the websites visited by our employees. However, we would not like to use any proxy based solutions. Our work is highly dependent on applications in which you cannot configure a proxy. Hence, the approach we would like to follow is setting up a router inside a computer (something like this : http://www.techrepublic.com/article/configure-windows-server-2003-to-act-as-a-router/5844624) This will also allow us to attach multiple ethernet cards and have redundancy in internet connectivity with complete abstraction from the user about which connection is being used. But most importantly, since all the traffic will be going through the computer (configured as a router) I assume there will be a way to run packet analysis on all the request / responses being made. For example, list all the FTP servers connected to (port 21), give a graph of all the URLs visited per day by frequency. Is there already a software which does this ? Or is it possible to build something like this ?

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• What do I do when I get a Linux kernel bug?

  - by raldi

  I just bought a tiny computer called a fit-pc2 which came with a somewhat customized Ubuntu 9.10 installation. uname -a reports: Linux 2.6.31-34-fitpc2 #7 SMP Thu Apr 22 17:43:26 IDT 2010 i686 GNU/Linux It seems that after several hours of running with heavy network load, all networking ceases and I get the following in kern.log: BUG: unable to handle kernel paging request at ff09dfc0 IP: [<c0150300>] kthread_should_stop+0x10/0x20 *pde = 00000000 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb1/idVendor Modules linked in: binfmt_misc ppdev sbc_fitpc2_wdt snd_usb_audio snd_usb_lib i2c_isch sch_gpio snd_seq_dummy snd_hda_intel snd_pcm_oss snd_seq_oss snd_seq_midi snd_rawmidi snd_mixer_oss snd_seq_midi_event snd_seq snd_pcm snd_timer snd_page_alloc snd_seq_device iptable_filter ip_tables x_tables snd_hwdep lpc_sch snd psmouse rt2860sta(C) uvcvideo video pl2303 soundcore mfd_core output videodev v4l1_compat lirc_igorplugusb lirc_dev serio_raw lp parport usbhid r8169 mii iegd_mod drm agpgart Pid: 16, comm: kblockd/1 Tainted: G C (2.6.31-34-fitpc2 #7) SBC-FITPC2 EIP: 0060:[<c0150300>] EFLAGS: 00010246 CPU: 1 EIP is at kthread_should_stop+0x10/0x20 EAX: ff09dfc4 EBX: c180cbac ECX: 0109d000 EDX: f709df98 ESI: f709df98 EDI: c180cba0 EBP: f709dfb8 ESP: f709df90 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process kblockd/1 (pid: 16, ti=f709c000 task=f7084b60 task.ti=f709c000) Stack: c014c14d c180cba4 00000000 f7084b60 c0150770 f709dfa4 f709dfa4 f7023ef4 <0> c180cba0 c014c0d0 f709dfe0 c015047c 00000000 00000000 00000000 f709dfcc <0> f709dfcc c0150400 00000000 00000000 00000000 c0103ce7 f7023ef4 00000000 Call Trace: [<c014c14d>] ? worker_thread+0x7d/0xe0 [<c0150770>] ? autoremove_wake_function+0x0/0x40 [<c014c0d0>] ? worker_thread+0x0/0xe0 [<c015047c>] ? kthread+0x7c/0x90 [<c0150400>] ? kthread+0x0/0x90 [<c0103ce7>] ? kernel_thread_helper+0x7/0x10 Code: a6 8b 55 0c 8d 4d e0 89 f8 89 34 24 e8 7a fd ff ff 89 c3 eb 92 90 90 90 90 90 90 55 64 a1 00 80 76 c0 8b 80 70 02 00 00 89 e5 5d <8b> 40 fc c3 8d b6 00 00 00 00 8d bf 00 00 00 00 55 ba d7 86 62 EIP: [<c0150300>] kthread_should_stop+0x10/0x20 SS:ESP 0068:f709df90 CR2: 00000000ff09dfc0 ---[ end trace 06004df70b9cf435 ]--- BUG: unable to handle kernel paging request at ff09dfc8 IP: [<c0521bc8>] _spin_lock_irqsave+0x18/0x30 *pde = 00000000 Oops: 0002 [#2] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb1/idVendor Modules linked in: binfmt_misc ppdev sbc_fitpc2_wdt snd_usb_audio snd_usb_lib i2c_isch sch_gpio snd_seq_dummy snd_hda_intel snd_pcm_oss snd_seq_oss snd_seq_midi snd_rawmidi snd_mixer_oss snd_seq_midi_event snd_seq snd_pcm snd_timer snd_page_alloc snd_seq_device iptable_filter ip_tables x_tables snd_hwdep lpc_sch snd psmouse rt2860sta(C) uvcvideo video pl2303 soundcore mfd_core output videodev v4l1_compat lirc_igorplugusb lirc_dev serio_raw lp parport usbhid r8169 mii iegd_mod drm agpgart Pid: 16, comm: kblockd/1 Tainted: G D C (2.6.31-34-fitpc2 #7) SBC-FITPC2 EIP: 0060:[<c0521bc8>] EFLAGS: 00010086 CPU: 1 EIP is at _spin_lock_irqsave+0x18/0x30 EAX: 00000100 EBX: ff09dfc8 ECX: 00000286 EDX: ff09dfc8 ESI: f7084b60 EDI: ff09dfc4 EBP: f709dd88 ESP: f709dd88 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process kblockd/1 (pid: 16, ti=f709c000 task=f7084b60 task.ti=f709c000) Stack: f709dda4 c0127c0b 00000082 00000001 ff09dfc4 f7084b60 00000000 f709ddd0 <0> c0137fd2 00000086 f70954c4 00000000 f7098480 f709ddf0 f7094fc0 f7084b60 <0> 00000000 00000009 f709ddf0 c013c3f8 00000001 c1807c60 f709ddf0 f7084b60 Call Trace: [<c0127c0b>] ? complete+0x1b/0x60 [<c0137fd2>] ? mm_release+0x52/0xf0 [<c013c3f8>] ? exit_mm+0x18/0x110 [<c013c6db>] ? do_exit+0xfb/0x2e0 [<c013998a>] ? print_oops_end_marker+0x2a/0x30 [<c0522aab>] ? oops_end+0x8b/0xd0 [<c011eac4>] ? no_context+0xb4/0xd0 [<c011eb1d>] ? __bad_area_nosemaphore+0x3d/0x1a0 [<c0133a56>] ? load_balance_newidle+0x96/0x320 [<c011ec92>] ? bad_area_nosemaphore+0x12/0x20 [<c0524106>] ? do_page_fault+0x2f6/0x380 [<c012cc30>] ? finish_task_switch+0x50/0xe0 [<c0523e10>] ? do_page_fault+0x0/0x380 [<c0522006>] ? error_code+0x66/0x70 [<c0523e10>] ? do_page_fault+0x0/0x380 [<c0150300>] ? kthread_should_stop+0x10/0x20 [<c014c14d>] ? worker_thread+0x7d/0xe0 [<c0150770>] ? autoremove_wake_function+0x0/0x40 [<c014c0d0>] ? worker_thread+0x0/0xe0 [<c015047c>] ? kthread+0x7c/0x90 [<c0150400>] ? kthread+0x0/0x90 [<c0103ce7>] ? kernel_thread_helper+0x7/0x10 Code: 00 00 00 55 89 e5 f0 83 28 01 79 05 e8 02 ff ff ff 5d c3 55 89 c2 89 e5 9c 58 8d 74 26 00 89 c1 fa 90 8d 74 26 00 b8 00 01 00 00 <f0> 66 0f c1 02 38 e0 74 06 f3 90 8a 02 eb f6 89 c8 5d c3 90 8d EIP: [<c0521bc8>] _spin_lock_irqsave+0x18/0x30 SS:ESP 0068:f709dd88 CR2: 00000000ff09dfc8 ---[ end trace 06004df70b9cf436 ]--- Fixing recursive fault but reboot is needed! This seems to happen at least once a day. How do I even begin to debug this?

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• What do I do when I get a Linux kernel bug?

  - by raldi

  I just bought a tiny computer called a fit-pc2 which came with a somewhat customized Ubuntu 9.10 installation. uname -a reports: Linux 2.6.31-34-fitpc2 #7 SMP Thu Apr 22 17:43:26 IDT 2010 i686 GNU/Linux It seems that after several hours of running with heavy network load, all networking ceases and I get the following in kern.log: BUG: unable to handle kernel paging request at ff09dfc0 IP: [<c0150300>] kthread_should_stop+0x10/0x20 *pde = 00000000 Oops: 0000 [#1] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb1/idVendor Modules linked in: binfmt_misc ppdev sbc_fitpc2_wdt snd_usb_audio snd_usb_lib i2c_isch sch_gpio snd_seq_dummy snd_hda_intel snd_pcm_oss snd_seq_oss snd_seq_midi snd_rawmidi snd_mixer_oss snd_seq_midi_event snd_seq snd_pcm snd_timer snd_page_alloc snd_seq_device iptable_filter ip_tables x_tables snd_hwdep lpc_sch snd psmouse rt2860sta(C) uvcvideo video pl2303 soundcore mfd_core output videodev v4l1_compat lirc_igorplugusb lirc_dev serio_raw lp parport usbhid r8169 mii iegd_mod drm agpgart Pid: 16, comm: kblockd/1 Tainted: G C (2.6.31-34-fitpc2 #7) SBC-FITPC2 EIP: 0060:[<c0150300>] EFLAGS: 00010246 CPU: 1 EIP is at kthread_should_stop+0x10/0x20 EAX: ff09dfc4 EBX: c180cbac ECX: 0109d000 EDX: f709df98 ESI: f709df98 EDI: c180cba0 EBP: f709dfb8 ESP: f709df90 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process kblockd/1 (pid: 16, ti=f709c000 task=f7084b60 task.ti=f709c000) Stack: c014c14d c180cba4 00000000 f7084b60 c0150770 f709dfa4 f709dfa4 f7023ef4 <0> c180cba0 c014c0d0 f709dfe0 c015047c 00000000 00000000 00000000 f709dfcc <0> f709dfcc c0150400 00000000 00000000 00000000 c0103ce7 f7023ef4 00000000 Call Trace: [<c014c14d>] ? worker_thread+0x7d/0xe0 [<c0150770>] ? autoremove_wake_function+0x0/0x40 [<c014c0d0>] ? worker_thread+0x0/0xe0 [<c015047c>] ? kthread+0x7c/0x90 [<c0150400>] ? kthread+0x0/0x90 [<c0103ce7>] ? kernel_thread_helper+0x7/0x10 Code: a6 8b 55 0c 8d 4d e0 89 f8 89 34 24 e8 7a fd ff ff 89 c3 eb 92 90 90 90 90 90 90 55 64 a1 00 80 76 c0 8b 80 70 02 00 00 89 e5 5d <8b> 40 fc c3 8d b6 00 00 00 00 8d bf 00 00 00 00 55 ba d7 86 62 EIP: [<c0150300>] kthread_should_stop+0x10/0x20 SS:ESP 0068:f709df90 CR2: 00000000ff09dfc0 ---[ end trace 06004df70b9cf435 ]--- BUG: unable to handle kernel paging request at ff09dfc8 IP: [<c0521bc8>] _spin_lock_irqsave+0x18/0x30 *pde = 00000000 Oops: 0002 [#2] SMP last sysfs file: /sys/devices/pci0000:00/0000:00:1d.7/usb1/idVendor Modules linked in: binfmt_misc ppdev sbc_fitpc2_wdt snd_usb_audio snd_usb_lib i2c_isch sch_gpio snd_seq_dummy snd_hda_intel snd_pcm_oss snd_seq_oss snd_seq_midi snd_rawmidi snd_mixer_oss snd_seq_midi_event snd_seq snd_pcm snd_timer snd_page_alloc snd_seq_device iptable_filter ip_tables x_tables snd_hwdep lpc_sch snd psmouse rt2860sta(C) uvcvideo video pl2303 soundcore mfd_core output videodev v4l1_compat lirc_igorplugusb lirc_dev serio_raw lp parport usbhid r8169 mii iegd_mod drm agpgart Pid: 16, comm: kblockd/1 Tainted: G D C (2.6.31-34-fitpc2 #7) SBC-FITPC2 EIP: 0060:[<c0521bc8>] EFLAGS: 00010086 CPU: 1 EIP is at _spin_lock_irqsave+0x18/0x30 EAX: 00000100 EBX: ff09dfc8 ECX: 00000286 EDX: ff09dfc8 ESI: f7084b60 EDI: ff09dfc4 EBP: f709dd88 ESP: f709dd88 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 Process kblockd/1 (pid: 16, ti=f709c000 task=f7084b60 task.ti=f709c000) Stack: f709dda4 c0127c0b 00000082 00000001 ff09dfc4 f7084b60 00000000 f709ddd0 <0> c0137fd2 00000086 f70954c4 00000000 f7098480 f709ddf0 f7094fc0 f7084b60 <0> 00000000 00000009 f709ddf0 c013c3f8 00000001 c1807c60 f709ddf0 f7084b60 Call Trace: [<c0127c0b>] ? complete+0x1b/0x60 [<c0137fd2>] ? mm_release+0x52/0xf0 [<c013c3f8>] ? exit_mm+0x18/0x110 [<c013c6db>] ? do_exit+0xfb/0x2e0 [<c013998a>] ? print_oops_end_marker+0x2a/0x30 [<c0522aab>] ? oops_end+0x8b/0xd0 [<c011eac4>] ? no_context+0xb4/0xd0 [<c011eb1d>] ? __bad_area_nosemaphore+0x3d/0x1a0 [<c0133a56>] ? load_balance_newidle+0x96/0x320 [<c011ec92>] ? bad_area_nosemaphore+0x12/0x20 [<c0524106>] ? do_page_fault+0x2f6/0x380 [<c012cc30>] ? finish_task_switch+0x50/0xe0 [<c0523e10>] ? do_page_fault+0x0/0x380 [<c0522006>] ? error_code+0x66/0x70 [<c0523e10>] ? do_page_fault+0x0/0x380 [<c0150300>] ? kthread_should_stop+0x10/0x20 [<c014c14d>] ? worker_thread+0x7d/0xe0 [<c0150770>] ? autoremove_wake_function+0x0/0x40 [<c014c0d0>] ? worker_thread+0x0/0xe0 [<c015047c>] ? kthread+0x7c/0x90 [<c0150400>] ? kthread+0x0/0x90 [<c0103ce7>] ? kernel_thread_helper+0x7/0x10 Code: 00 00 00 55 89 e5 f0 83 28 01 79 05 e8 02 ff ff ff 5d c3 55 89 c2 89 e5 9c 58 8d 74 26 00 89 c1 fa 90 8d 74 26 00 b8 00 01 00 00 <f0> 66 0f c1 02 38 e0 74 06 f3 90 8a 02 eb f6 89 c8 5d c3 90 8d EIP: [<c0521bc8>] _spin_lock_irqsave+0x18/0x30 SS:ESP 0068:f709dd88 CR2: 00000000ff09dfc8 ---[ end trace 06004df70b9cf436 ]--- Fixing recursive fault but reboot is needed! This seems to happen at least once a day. How do I even begin to debug this?

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• redirect all youtube video requests to a specific one

  - by iTayb

  I'm on an IT team in my company and I would like to block youtube to users. I don't want to just deny access to the whole youtube domain, but only to replace the .flv/.mp4 request with the one that I want. That way, if someone tries to watch youtube videos on the network, He'll get a video of why using our expensive bandwidth for pleasure is a no-no. I thought about using a packet manipulation program and just replace the video ID with something that I want, but I didn't manage to do it right.

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• System Center Configuration Manager 2007 - Debugging Client Installs

  - by Dayton Brown

  Hi All: Having an issue installing the CCMsetup client on desktops. The CCMSetup makes it to the PC, files are there, it gets added to the services for automatic start, it starts, but quits almost instantly. Logs on the desktop show a entry like this. <![LOG[Failed to successfully complete HTTP request. (StatusCode at WinHttpQueryHeaders: 404)]LOG]!><time="14:28:51.183+240" date="06-11-2009" component="ccmsetup" context="" type="3" thread="2388" file="ccmsetup.cpp:5808"> What am I missing? EDIT: Firewall is off on both client and server.

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• Blocking IP Range in .htaccess Problem

  - by Pedro

  Hi, I'm trying to block the access of one of my webapps using IP Filter in the .htaccess, the problem is that after updating the file with: order allow,deny deny from 58.14.0.0/15 allow from all I get the folowing error: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. What is wrong? Regards, Pedro

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• Merge two different API calls into One

  - by dhilipsiva

  I have two different apps in my django project. One is "comment" and an other one is "files". A comment might save some file attached to it. The current way of creating a comment with attachments is by making two API calls. First one creates an actual comment and replies with the comment ID which serves as foreign key for the Files. Then for each file, a new request is made with the comment ID. Please note that file is a generic app, that can be used with other apps too. What is the cleanest way of making this into one API call? I want to have this as a single API call because I am in a situation where I need to send user an email with all the files as attachment when a comment is made. I know Queueing is the ideal way to do it. But I don't have the liberty to add queing to our stack now. So this was the only way I could think of.

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• How to visualize timer functionality in sequence diagram?

  - by truthseeker

  I am developing software for communication with external device through serial port. To better understand the new functionality I am trying to display it in sequence diagram. Flow of events is as follows. I send to the device command to reset it. This is asynchronous operation so there is some delay between request and response (typically 100 ms). There can be case when the answer never comes (for example device is not connected to the specified port or is currently turned off). For this purpose I create a timer with period twice the maximum answer time. In my case it is 2 * 125 ms = 250 ms. If the answer comes in predefined time interval, I destroy already running timer. If the answer doesnt come in predefined interval, timer initiates some action. After this action we can destroy it. How to effectively model this situation in sequence diagram? Addendum 1: Based on advices made by scarfridge i drew following UML diagram. Comment by Ozair is also helpful for simplifying the diagram even more.

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• IBus client for GNU Emacs: Installed, but how do I start it?

  - by fred.bear

  Having recently moved to Linux/Ubuntu, I'm looking for a good editor, and GNU Emacs seems to fit the bill. One thing I want from a text editor is the ability to handle Unicode Input Method Editors in a "normal way", across the board. For Ubuntu, the "normal way" is via IBus. However, emacs does not support IBus "off the shelf". I found a launchpad project: IBus client for GNU Emacs: ibus-el. I've installed ibus-el and set it up as per the Customize section of this emacswiki IBusMode page. I included the suggested "toggle" keybinding: ;; Use s-SPC to toggle input status It seems to have installed okay, but I have no idea how to invoke IBus and switch IMEs. s-SPC doesn't fire up the IBus language panel... I'm stuck :( ...so close, yet so far.... Here are the startup *messages* Loading 00debian-vars... No /etc/mailname. Reverting to default... Loading 00debian-vars...done Loading /etc/emacs/site-start.d/50autoconf.el (source)...done Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)... Loading debian-ispell... Loading /var/cache/dictionaries-common/emacsen-ispell-default.el (source)...done Loading debian-ispell...done Loading /var/cache/dictionaries-common/emacsen-ispell-dicts.el (source)...done Loading /etc/emacs/site-start.d/50dictionaries-common.el (source)...done Loading /etc/emacs/site-start.d/50festival.el (source)...done Loading /etc/emacs/site-start.d/50gtk-doc-tools.el (source)...done Loading /etc/emacs/site-start.d/50ibus-el.el (source)...done IBus: Xlib.protocol.request.QueryExtension IBus: Agent successfully started for display ":0.0"

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• Why am I not getting an sRGB default framebuffer?

  - by Aaron Rotenberg

  I'm trying to make my OpenGL Haskell program gamma correct by making appropriate use of sRGB framebuffers and textures, but I'm running into issues making the default framebuffer sRGB. Consider the following Haskell program, compiled for 32-bit Windows using GHC and linked against 32-bit freeglut: import Foreign.Marshal.Alloc(alloca) import Foreign.Ptr(Ptr) import Foreign.Storable(Storable, peek) import Graphics.Rendering.OpenGL.Raw import qualified Graphics.UI.GLUT as GLUT import Graphics.UI.GLUT(($=)) main :: IO () main = do (_progName, _args) <- GLUT.getArgsAndInitialize GLUT.initialDisplayMode $= [GLUT.SRGBMode] _window <- GLUT.createWindow "sRGB Test" -- To prove that I actually have freeglut working correctly. -- This will fail at runtime under classic GLUT. GLUT.closeCallback $= Just (return ()) glEnable gl_FRAMEBUFFER_SRGB colorEncoding <- allocaOut $ glGetFramebufferAttachmentParameteriv gl_FRAMEBUFFER gl_FRONT_LEFT gl_FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING print colorEncoding allocaOut :: Storable a => (Ptr a -> IO b) -> IO a allocaOut f = alloca $ \ptr -> do f ptr peek ptr On my desktop (Windows 8 64-bit with a GeForce GTX 760 graphics card) this program outputs 9729, a.k.a. gl_LINEAR, indicating that the default framebuffer is using linear color space, even though I explicitly requested an sRGB window. This is reflected in the rendering results of the actual program I'm trying to write - everything looks washed out because my linear color values aren't being converted to sRGB before being written to the framebuffer. On the other hand, on my laptop (Windows 7 64-bit with an Intel graphics chip), the program prints 0 (huh?) and I get an sRGB default framebuffer by default whether I request one or not! And on both machines, if I manually create a non-default framebuffer bound to an sRGB texture, the program correctly prints 35904, a.k.a. gl_SRGB. Why am I getting different results on different hardware? Am I doing something wrong? How can I get an sRGB framebuffer consistently on all hardware and target OSes?

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• Install remote desktop session host remotely

  - by Jorge

  I've removed the remote desktop host role from one of my Azue VM, so I can't RDP into it. I have tried to recreate the endpoints and even the VM with no luck. I can't either access remotely with Server Manager; getting this error: The client cannot connect to the destination specified in the request. Verify that the services on the destination is running" I cannot connect remotely to the registry Make sure this computer is on the network, has remote administration enabled, and that both computers are running the remote registry service PsPing tells me The remote computer refuses the network connection Which workaround can I follow to solve this?

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• How to design highly scalable web services in Java?

  - by Kshitiz Sharma

  I am creating some Web Services that would have 2000 concurrent users. The services are offered for free and are hence expected to get a large user base. In the future it may be required to scale up to 50,000 users. There are already a few other questions that address the issue like - Building highly scalable web services However my requirements differ from the question above. For example - My application does not have a user interface, so images, CSS, javascript are not an issue. It is in Java so suggestions like using HipHop to translate PHP to native code are useless. Hence I decided to ask my question separately. This is my project setup - Rest based Web services using Apache CXF Hibernate 3.0 (With relevant optimizations like lazy loading and custom HQL for tune up) Tomcat 6.0 MySql 5.5 My questions are - Are there alternatives to Mysql that offer better performance for what I'm trying to do? What are some general things to abide by in order to scale a Java based web application? I am thinking of putting my Application in two tomcat instances with httpd redirecting the request to appropriate tomcat on basis of load. Is this the right approach? Separate tomcat instances can help but then database becomes the bottleneck since both applications access the same database? I am a programmer not a Db Admin, how difficult would it be to cluster a Mysql database (or, to cluster whatever database offered as an alternative to 1)? How effective are caching solutions like EHCache? Any other general best practices? Some clarifications - Could you partition the data? Yes we could but we're trying to avoid it. We need to run a lot of data mining algorithms and the design would evolve over time so we can't be sure what lines of partition should be there.

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• Howto configure openSuSE firewall to route local traffic to local ports

  - by Eduard Wirch

  I have openSUSE 11.3 installed. I'm using the openSUSE firewall configuration mechanism (/etc/sysconfig/SuSEfirewall2). I have a http server application running on port 8080. I want the http service to be accessible using port 80. I created a redirect rule usign: FW_REDIRECT="0/0,0/0,tcp,80,8080" This works fine for every request coming from external. But it doesn't for local requests. (example: wget http://myserver/) Is there a way how I can tell the firewall to redirect local requests addressed for 80 to port 8080? (using the SUSE firewall configuration file)

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• Debugging Windows Service Timeout Error 1053

  - by Joe Mayo

  If you ever receive an Error 1053 for a timeout when starting a Windows Service you've written, the underlying problem might not have anything to do with a timeout.  Here's the error so you can compare it to what you're seeing: --------------------------- Services --------------------------- Windows could not start the Service1 service on Local Computer.   Error 1053: The service did not respond to the start or control request in a timely fashion. --------------------------- OK   --------------------------- Searching the Web for a solution to this error in your Windows Service will result in a lot of wasted time and advice that won't help.  Sometimes you might get lucky if your problem is exactly the same as someone else's, but this isn't always the case.  One of the solutions you'll see has to do with a known error on Windows Server 2003 that's fixed by a patch to the .NET Framework 1.1, which won't work.  As I write this blog post, I'm using the .NET Framework 4.0, which is a tad bit past that timeframe. Most likely, the basic problem is that your service is throwing an exception that you aren't handling.  To debug this, wrap your service initialization code in a try/catch block and log the exception, as shown below: using System; using System.Diagnostics; using System.ServiceProcess; namespace WindowsService { static class Program { static void Main() { try { ServiceBase[] ServicesToRun; ServicesToRun = new ServiceBase[] { new Service1() }; ServiceBase.Run(ServicesToRun); } catch (Exception ex) { EventLog.WriteEntry("Application", ex.ToString(), EventLogEntryType.Error); } } } } After you uninstall the old service, redeploy the service with modifications, and receive the same error message as above; look in the Event Viewer/Application logs.  You'll see what the real problem is, which is the underlying reason for the timeout. Joe

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• Backup Failed, need help not failing

  - by Costa

  Backup (Deja Dup) failed to do an initial backup to my Amazon S3, and despite my best Googling efforts, I could not find a solution : ( Here's the error message: BackendException: Error uploading s3+http://deja-dup-auto-akiaiksyiqi3buaaz26a/My-Archive/duplicity-full.20130805T143807Z.vol1.difftar.gpg I'm running Ubuntu 12.04 LTS on a System76. The folder I'm trying to backup to in S3 is set to store as Amazon Glacier Storage. Any help would rock! Update: better debugging info: DUPLICITY: . Failed to create bucket (attempt #1) 'deja-dup-auto-axxxxxxxxxxxa' failed (reason: S3ResponseError: S3ResponseError: 403 Forbidden DUPLICITY: . <?xml version="1.0" encoding="UTF-8"?> DUPLICITY: . <Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><StringToSignBytes>47 00 54 0a 0a 0a 4d 6f 6e 00 20 30 35 20 00 75 67 20 32 30 31 00 00 35 00 32 34 3a 31 32 20 47 4d 00 0a 2f 64 65 6a 61 2d 64 75 70 2d 61 75 74 6f 2d 61 6b 69 00 6b 73 79 69 71 69 33 62 75 61 00 7a 32 36 61 2f</StringToSignBytes><RequestId>8000000000003</RequestId><HostId>Uxxxxxxxxxxxxxxxxx/xxxxxxxxxxxxxxxxRF</HostId><SignatureProvided>yxxxxxxxxxxxxxxxxxxxxx</SignatureProvided><StringToSign>GET

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• Modify HTML Content with Squid

  - by user38400

  We have setup our network as per the tutorial here: https://help.ubuntu.com/community/Upside-Down-TernetHowTo. Basically, we have a squid proxy that inverts images for pages that clients request. We're trying to modify the script so that we can edit the contents of the webpage before the webpage is sent to the client. We are not having any luck. I'm wondering if there is something different about .html files that makes this not possible. What is happening is that we do a wget on the URI that is requested, save it locally, modify it and then echo back the new URI. The page that the user gets is the unmodified page and not the one that we just changed.

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• Does this BSD-like license achieve what I want it to?

  - by Joseph Szymborski

  I was wondering if this license is: self defeating just a clone of an existing, better established license practical any more "corporate-friendly" than the GPL too vague/open ended and finally, if there is a better license that achieves a similar effect? I wanted a license that would (in simple terms) be as flexible/simple as the "Simplified BSD" license (which is essentially the MIT license) allow anyone to make modifications as long as I'm attributed require that I get a notification that such a derived work exists require that I have access to the source code and be given license to use the code not oblige the author of the derivative work to have to release the source code to the general public not oblige the author of the derivative work to license the derivative work under a specific license Here is the proposed license, which is just the simplified BSD with a couple of additional clauses (all of which are bolded). Copyright (c) (year), (author) (email) All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. The copyright holder(s) must be notified of any redistributions of source code. The copyright holder(s) must be notified of any redistributions in binary form The copyright holder(s) must be granted access to the source code and/or the binary form of any redistribution upon the copyright holder's request. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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• Cannot Login to SBS 2008

  - by Ryan Holt

  Hi All, I'm hoping someone has an answer for me... I installed a new Microsoft SBS 2008 server last week and everything appeared to be working normally. I went to reboot the server yesterday to finish the install for Microsoft Windows Installer 4.5 and upon reboot could no longer login to the server via either RDP or local console. The error message I get states that there are no logon servers available to service the logon request. I'm able to login to the server fine via Safe Mode with Networking but cannot login via a normal method. The server is currently at SP1. I attempted to install SP2 inside of safe mode after enabling the installation services via a registry edit but the install failed and rolled back after 2 or 3 hours. It appears that one of the services is not starting for some reason. I believe it's LSASS but can't actually login to see the active services during a normal boot. Does anyone have any suggestions?

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• Cost effective way to provide static media content

  - by james

  I'd like to be able to deliver around 50MB of static content, either in about 30 individual files up to 10MB or grouped into 3 compressed files, around 5k to 20k times a day. Ideally I'd like to put some sort of very basic security around providing the data to ensure that a request is from the expected source, but if tossing the security for a big reduction in price is possible then it's an option. Does anyone have any suggestions other than what I've found: Google AppEngine is $0.12/GB & I believe has a file size limit of 10MB so I'd have to break the data up a bit. So a rough calculation would seem to be that this would cost me about $30 to $120 a day. Or I've seen something like what seems to be just public static content delivery with no type of logic capabilities like Usenet.nl at what I think calculates to about $0.025/GB which would cost me about $6 to $25 a day. Any idea if I'm going about these calculations right & if there might be a better option for just static content on a decently high volume delivery? Again some basic security would be great but if cost is greatly reduced without it then I'm up for that.

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• 503 service unavailable when debugging PHP script in Zend Studio

  - by user25932

  I have a web server with apache 2.0 installed. It comes with Zend Server install pack. When I’m trying to debug my php files apache serves a blank page with 503 service unavailable. Of course slow server-side code is tying up Apache requests for far too long, but I need it to wait, until my debugging comes to end. When I call to the page from a browser it launches ZendStudio debugging my PHP script (request redirects Zend Debugger module). I debug through my script and if I finish debugging in 120 seconds, I normally return to the browser. When it takes more than 120 seconds the browser displays '503 service unavailable' and I can't return to page output. I have even forced 'max_execution_time = 300' 'max_input_time = 600' in php.ini and 'TimeOut = 500' in httpd.conf. No matter whether it is Opera, IE or Firefox. I spent two days googling it, no right answer until now.

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• Connection to mysql server in SYN_SENT

  - by Sunil

  We are facing a strange problem from last few days between our application server and database server(Mysql): connection to database server from application server hangs in SYN_SENT state and after that we are not able to make any connection to database server on mysql port(3306). When we checked the netstat output on database server its in SYN_RECV state. What I can figure out is mysql server is receiving the SYN request and responding also and its not reaching to the client hence SYN_RECV at server side and SYN_SENT at client side. I think SYN_SENT state should go after some time and because of this other db connection attempts to same server should not hang. Does anybody have any idea how can we resolve this issue? Out setup details : Application server: RHEL 5.4, kernel-release = 2.6.18-164.el5, x86_64 Database server: Mysql Version : 5.1.49 RHEL 5.4, kernel-release = 2.6.18-164.el5, x86_64

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