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  • new ubuntu server installation - java server not receiving packets

    - by James
    I have developed a Java server which listens for UDP packets which come from mobile devices. At the moment, it works correctly if I run my Server on my windows PC. I can receive and respond to the UDP packets sent from my phone (over 3g, not wifi). However, I am trying to run the Server on a different computer which I found lying around my house. I have basically done a clean install of Ubuntu Server edition, updated it, installed the java run time environment and configured port forwarding to allow connections on the appropriate port. I have also tried to disable the firewall. The problem is, it doesn't appear as if the server is receiving any packets and I've exhausted my brain thinking on how to solve/debug the problem. Can anyone suggest to me what the problem might be? or more likely something I can do to help me find out more information about what is going wrong.

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  • Regression testing for firewall changes

    - by James C
    We have a number of firewalls in place around our organisation and in some cases packets can pass through four levels of firewall limiting the flow TCP traffic. A concept that I'm used to from software testing is regression testing, allowing you to run a test suite against a changed application to verify that the new changes haven't affected any old features. Does anyone have any experience or an offer any solutions to being able to perform the same type of thing with firewall changes and network testing? The problem becomes a lot more complicated because you'd ideally want to be originating (and testing receipt) of packets across many machines.

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  • Alienware Aurora R2 Slow Boot Up

    - by James R
    I have an Aurora R2 bought a few years ago, and recently I decided a RAM update and new Samsung SSD would be good for speed. So now it's super fast, with the exception of booting up. It still takes good 2 minutes to get past the first splash screen on the BIOS, it's only the BIOS, after that it's like lightning. I've Googled the issue, and the usual problem is the BIOS trying to boot from anything it can, with the fix being to change the boot menu. However I've changed it now, and it's still slow. When I disconnect the USB devices it speeds up, but I can't do that every time I want to boot the PC up! The only other option I can think of is upgrading the BIOS, however it seems that A04 is the recommended on for Aurora R2s, so I don't know if upgrading the BIOS could cause issues, especially not if it doesn't solve the issue. Also, when I disable my original hard drive in the boot menu, the PC won't boot up. Despite the Samsung one being fine to boot from, and the original not being needed as far as I know for starting Windows, it gives me an error message and makes me restart the PC, with a new boot configuration (with the original drive as second choice). Any ideas on how to make the BIOS boot faster? And why I need to have my original drive in the boot menu?

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  • How to determine the best byte size for the dd command

    - by James
    I know that doing a dd if=/dev/hda of=/dev/hdb does a deep hard drive copy. I've heard that people have been able to speed up the process by increasing the number of bytes that are read and written at a time (512) with the "bs" option. People have suggested that the optimal byte size is due to sector size. I personally think it would have something to do with the amount of cache that the hard drive has. My question is: What determines the ideal byte size for copying from a hard drive? and Why does that determine the ideal byte size?

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  • Visual Studio Installed - Icons not showing correctly

    - by James
    Hello, I have just installed Visual Studio but it seems to have not installed properly. Here is a picture of the problem: As you can see, there is no icon for the solution file even though Windows recognizes it correctly as a Visual Studio solution and opens it correctly. How can I fix this? Thankyou.

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  • Failing to load rootfs: Ubuntu 10 + grub2 + rootfs ext4 w/ RAID1

    - by James
    I am having problems booting a new Ubuntu 10 (server) install. My primary HD (/dev/sda) is laid out as follows: Device Boot Start End Blocks Id System /dev/sda1 * 1 18 144553+ 83 Linux <-- /BOOT /dev/sda2 19 182401 1464991447+ 5 Extended /dev/sda5 19 2207 17583111 fd Linux raid autodetect /dev/sda6 2208 11934 78132096 fd Linux raid autodetect <-- / (ROOTFS) /dev/sda7 11935 182401 1369276146 fd Linux raid autodetect The rootfs is part of a RAID1 (software) array (currently degraded): # cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md2 : active raid1 sda6[1] 78132032 blocks [2/1] [_U] The UUIDs for the partitions are as follows: # blkid /dev/sda1 /dev/sda1: UUID="b25dd301-41b9-4f4d-9b0a-0e31713dd74c" TYPE="ext2" # blkid /dev/sda6 /dev/sda6: UUID="af7b9ede-fa53-c0c1-74be-31ec752c5cd5" TYPE="linux_raid_member" # blkid /dev/md2 /dev/md2: UUID="a0602d42-6855-482f-870c-6f6ecdcdae3f" TYPE="ext4" Finally, I have my grub2 menuentry setup as follows: ### BEGIN /etc/grub.d/10_linux ### menuentry 'Ubuntu, with Linux 2.6.32-25-server' --class ubuntu --class gnu-linux --class gnu --class os { insmod ext2 insmod raid insmod mdraid set root='(hd0,1)' search --no-floppy --fs-uuid --set b25dd301-41b9-4f4d-9b0a-0e31713dd74c linux /vmlinuz-2.6.32-25-server root=UUID=a0602d42-6855-482f-870c-6f6ecdcdae3f ro nosplash noplymouth initrd /initrd.img-2.6.32-25-server } When I attempt to boot, grub loads OK, however I eventually get the following error message: Gave up waiting for root device. ALERT /dev/disk/by-uuid/a0602d42-6855-482f-870c-6f6ecdcdae3f does not exist. Dropping to a shell! If from the grub bootloader I open a grub command line, I can ls (hd0,) and it lists the correct partitions with the UUIDs as shown above - sda6 shows 'a0602d42-6855-482f-870c-6f6ecdcdae3f' (the RAID UUID). If I ls (md2)/ it properly lists all the files on the RAID1 filesystem (ext4) so it doesn't appear to be an issue accessing the raid device. Does anyone have any suggestions as to what the problem might be? I can't figure this one out.

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  • Upgrade Ubuntu linux-virtual on EC2

    - by James Ward
    I have an Ubuntu 10.10 EBS boot server on EC2. There are new updates available for it: linux-image-virtual linux-virtual Is it even ok to upgrade those packages on an EC2 server? When I do try to upgrade them I get: The following packages have been kept back: linux-image-virtual linux-virtual Should I do a dist-upgrade or something to force it? Will my instance be able to be rebooted?

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  • Is an Adnroid-based Phone a Suitable MP3 Player for Music Streamed over the Internet?

    - by James McFarland
    I am considering getting an HTC phone running Android from Verizon Wireless when I next upgrade my phone. I also have an online account with a music vendor, where I have rights to listen to my collection, but not download the MP3s. Further, I have an unlimited data plan and Wi-Fi, so I have full access to bandwidth volume without any concerns. I am especially interested in mounting my phone in a car kit, and streaming my online music to my car's sound system while driving. If you are experienced in this scenario, or have tried this scenario - Is is reasonable to expect my HTC Android phone to provide me with streaming music via my cell data plan anywhere I get cell service?

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  • Nginx Redirection Issue

    - by James Gu
    My Nginx setting currently has this: location / { if (!-e $request_filename){ rewrite ^/(.*)$ https://domain.com/index.php?id=$1 redirect; } } Basically for non-existing pages (404) it redirects user to the home page. But now I have a wordpress blog setup at https://domain.com/blog/, but any wordpress items eg. https://domain.com/blog/test also got redirected to the home page. I wonder how to fix this?

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  • How do I mount an external USB hard drive on my Sheevaplug?

    - by James
    I've acquired a Sheevaplug running - I think - Ubuntu. I'd like to mount an external USB hard drive, but I don't know the name of the device that needs mounting. When I list the devices under /dev, a long list is produced. How do I find out which device listed needs to be mounted? Update: When I run dmesg after plugging the device in, I see the following at the end: usb 1-1: new high speed USB device using ehci_marvell and address 6 usb 1-1: device not accepting address 6, error -71 usb 1-1: new high speed USB device using ehci_marvell and address 7 usb 1-1: device not accepting address 7, error -71 usb 1-1: new high speed USB device using ehci_marvell and address 8 usb 1-1: device not accepting address 8, error -71 usb 1-1: new high speed USB device using ehci_marvell and address 9 usb 1-1: device not accepting address 9, error -71 And when I view /var/log/messages, I can see this: Sep 23 21:26:03 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Sep 23 21:26:04 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Sep 23 21:26:05 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Sep 23 21:26:05 debian kernel: usb 1-1: new high speed USB device using ehci_ma$ Unfortunately, I don't know what these mean.

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  • Error when adding to the domain : the specified server cannot perform the requested operation

    - by James
    When we add computers to the domain in Windows 7, we get the error: Changing the Primary Domain DNS name of this computer to "" failed. The name will remain "domain.com". The error was: The specified server cannot perform the requested operation. This happens on multiple computers and retrying yields the same result. Despite the error, the computer is still able to login to the domain ok. The DCs are windows 2003. Has anyone found a way to get rid of this error? Any help is appreciated.

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  • Serious voltage and temperature problems

    - by James Willson
    My computer has been acting up when I play games so I wanted to look into why. Issue 1: GPU Temp According to afterburner and speedfan my 8800GTX idles at 90 degrees and then when playing games shoots up to over 110C which is when my graphics basically starts to give rendering issues. Issue 2: CPU Temp Speedfan is saying my CPU temp is 83C idle but when I look at core temp it says core0 is at 35C and core1 is at 33C. Issue 3: Voltages This is what speedfan is saying for my voltages: Vcore1: 1.01V Vcore2: 1.90V +3.3V: 3.31V +5V: 4.95V +12V: 0.51V -12V: -16.80V -5V: -8.43V +5V 5.13V Vbat: 3.25V Vcore: 3.00V +3.3V: 3.20V These voltages, for lack of a better word, look f*cked. With all this happening, the computer runs ok under normal use. Is the software giving out incorrect readouts or instead should I immediately move the computer into another room before it explodes? P.s I would like to add this is a stock system. EVGA 8800GTX, E6850 CPU, 800W PSU

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  • Can I simulate human typing on Windows?

    - by James Sulak
    I'm working on a talk that will involve typing code and running it in front of an audience. So I don't screw it up, I'd like to pre-record typing the more complicated bits of the source code and play it back. Most programs I've found that do similar things (like AutoHotKey) dump the text instantaneously as a giant block. Is there any program that will do this and allow me to adjust the play-back speed?

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  • How can I modify keyboard shortcuts for Firefox?

    - by e.James
    I recently started using Firefox as my primary web browser, and I would like to change some of the default keyboard shortcuts, especially the ones used to switch between tabs. Can this be done? I took a peek through the Firefox directory in "Application Support", as well as the application bundle itself, but nothing jumped out. Google searches have also proved fruitless. Any help is appreciated! Update: I'm running Firefox version 3.6 for Mac OS 10.6.2

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  • Automation Question using VMWare Workstation

    - by James K
    I'm running an experiment that requires me to create 100 instances of Windows XP w/SP3 and saving each VM instance off to a hard drive. I have to annotate the time that the VM load starts (starting my timer when I see the "Setup is preparing...") until the load ends when I see the final desktop after VM loads its drivers. I also have to annotate the host start and stop time. Is there any way this process can be automated? Each load runs me about 16:00 minutes and gets real tiresome after a time. BTW... Exact timing is not necessary, eyeballing as described above is sufficient for my testing needs.

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  • Windows 7 - You don't have permissions to save in this folder

    - by James
    Huh? I'm getting this message - "You don't have permissions to save in this folder" - even though I am the only user on this machine, and administrator. How can I set permissions for myself to do everything, everywhere (including saving deleting etc)? Thanks. Edit: Sorry, forgot to say which folder it was. It is a folder in Program Files, where I save my PHP files for local testing. Sorry if Im a bit daft with all this, but I've upgraded straight from XP to 7, and having never used vista, I'm used to being allowed to have full control.

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  • wamp - Changing PHP version stops server running

    - by James Connor
    I downloaded wamp which works (green icon). However I need to test a site locally in Joomla 1.5 which caused errors when using php 5.3 I believe I need a PHP version lower then this i.e 5.2.x To do this I have gone through PHP - Version - Get More.. and installed a older PHP version. However when I start this PHP version the icon stays on an orange colour and going in localhost doesn't work. I haven't used wamp before so my knowledge of it is limited. If anyone could point me in the right direction it would be greatly appreciated, Regards.

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  • My 4 GB microSD card only allows me to use 1 GB

    - by James Litewski
    My phone came with a 4 GB microSD card. On the card it lists that 3 GB goes to Muve Music which is Cricket's music program, and I get 1 GB... Well, I don't pay for Muve Music, so why waste the space? I thought I'd be able to simply buy an adapter and reformat the microSD card to get the full 4 GB; but that wasn't the case... I could only find the 1 GB partition on the card. I even tried reformatting the disk, but I had no luck. How can I get the full 4 GB? BTW, I'm running Mac OS X v10.7 (Lion).

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  • In an Excel calendar, how can I create a calendar event for a date based on an entry for another date?

    - by James
    Sounds a bit confusing, doesn't it? I've created an 'events calendar' in Excel for my local area. Each date throughout the year is assigned to a row. What I want to do is, when I enter an event for a particular date, then automatically create an entry elsewhere in the calendar for an action to be taken. So for example, There's an event on the 30th July, so I enter it into the calendar. I'd like to be able to specify that an entry should be made 4 weeks earlier, on the 2nd July, to tell me to blog, tweet or whatever about that particular event. Can Excel help me to do that and if so, what do I need to do?

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  • Is this a valid backup strategy for MongoDB?

    - by James Simpson
    I've got a single dedicated server with a MongoDB database of around 10GB. I need to do daily backups, but I can't have downtime with the database. Is it possible to use a replica set on a single disk (with 2 instances of mongod running on different ports), and simply take the secondary one offline and backup the data files to an offsite storage such as S3 (journaling is turned on)? Or would using master/slave be better than a replica set? Is this viable, and if so, what potential problems could I have? If not, how do I conceptualize this to work?

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  • Windows 7 Locking Executable Files

    - by James Burgess
    Since I've been using Windows 7 RTM (as opposed to the Beta and RCs), I've been having a peculiar issue with executable files. I first noticed it whilst using Visual Studio, in that when building a project, it would often fail saying that the output file was locked - but the problem has stemmed further. When I've executed an application, closed it (cleanly), and attempted to delete/move/rename/overwrite said file, Windows 7 tells me that the file is locked/access is denied. I've made use of software like LockHunter/Unlocker but it is seemingly unable to remove these locks (most of the time, it shows no locks at all). After about 5-10 minutes, the respective files are unlocked again, but needless to say this is a bit of a workflow-breaker (as it's not simply constrained to VS). I've done the usual tasks of virus/malware scanning, and turned up with absolutely nothing. I've got no peculiar services running, and the problem was not present before I installed a Windows 7 RTM version. Any help is greatly appreciated.

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  • Choosing a home network layout

    - by James M.
    I have a server, 4 PC's, a network printer, a switch and an ADSL modem. Currently the server runs Red Hat 9 and sits between the internet and the other PCs like in http://upload.wikimedia.org/wikipedia/en/1/12/Sample-network-diagram.png I have bought a new server PC to replace the old one, and I plan to install Fedora Core linux on it. The server acts as web and file server. The PCs all run Windows. Alternatively, I could connect the new server and all PCs to the switch, and connect the switch to the modem. (Sorry, couldn't find an image.) What are the pros and cons of these network layouts? Eg. in terms of reliability, security and flexibility? I am not a Linux guru but know of (and am not afraid of) iptables, dhcpd et al. Thank you for any tips, pointers and links.

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  • Macbook Pro 2.2ghz 2011 (OSX 10.6.7) problem with NTFS 3G

    - by James
    I installed NTFS 3G but now get the following error message when I try to plug in my external drive. I also get it on startup about my Windows partition. Uninstall/ reinstall does not work. NTFS-3G could not mount /dev/disk1s1at /volumes/freeagent GoFlex Drive because the following error occured: /library/filesystems/fuse.fs/support/fusefs.kext failed to load- (libkern/kext) link error; check the system/ kernel logs for errors or try kextutil(8). The MacFUSE file system is not available (71) Any help would be great. I'd hope to avoid reinstalling OS X if possible!

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