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• TIME_WAIT connections not being cleaned up after timeout period expires

  - by Mark Dawson

  I am stress testing one of my servers by hitting it with a constant stream of new network connections, the tcp_fin_timeout is set to 60, so if I send a constant stream of something like 100 requests per second, I would expect to see a rolling average of 6000 (60 * 100) connections in a TIME_WAIT state, this is happening, but looking in netstat (using -o) to see the timers, I see connections like: TIME_WAIT timewait (0.00/0/0) where their timeout has expired but the connection is still hanging around, I then eventually run out of connections. Anyone know why these connections don't get cleaned up? If I stop creating new connections they do eventually disappear but while I am constantly creating new connections they don't, seems like the kernel isn't getting chance to clean them up? Is there some other config options I need to set to remove the connections as soon as they have expired? The server is running Ubuntu and my web server is nginx. Also it has iptables with connection tracking, not sure if that would cause these TIME_WAIT connections to live on. Thanks Mark.

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• How to troubleshoot a remote wmi query/access failure?

  - by Roman

  Hi I'm using Powershell to query a remote computer in a domain for a wmi object, eg: "gwmi -computer test -class win32_bios". I get this error message: Value does not fall within the expected range Executing the query local under the same user works fine. It seems to happen on both windows 2003 and also 2008 systems. The user that runs the shell has admin rights on the local and remote server. I checked wmi and dcom permissions as far as I know how to do this, they seem to be the same on a server where it works, and another where it does not. I think it is not a network issue, all ports are open that are needed, and it also happens within the same subnet. When sniffing the traffic we see the following errors: RPC: c/o Alter Cont Resp: Call=0x2 Assoc Grp=0x4E4E Xmit=0x16D0 Recv=0x16D0 Warning: GssAPIMechanism is not found, either caused by not reassembled, conversation off or filtering. And an errormessage from Kerberos: Kerberos: KRB_ERROR - KDC_ERR_BADOPTION (13) The option code in the packet is 0x40830000 Any idea what I should look into?

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• Thinking of Powerline adapters for networking

  - by Henderson McCoy

  will powerline work as good as wifi I am now in a large house (renting a room) and the router is in the front of the house and I am in the back. Don't know if wifi will have the range and stability so I am looking at all the alternatives from running a long cable to powerline. looks like a powerline adapter set will cost about $50 http://www.bestbuy.com/site/Actiontec---500-Mbps-Powerline-Home-Theater-Network-Adapter-Kit/5215483.p?id=1218625358741&skuId=5215483 has anyone use these or other powerline adapters? how is powerlines speed? Are they more stable then wifi? powerline cost is good i am just currious about the performance

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• Linux wget, how to display progress percentage after session has reload?

  - by skyrail

  I am running debian Squeeze in console mode on a plug computer. I control it opening an SSH session from a Windows machine, on the same local network. I started downloading a large file using wget. What I get is a console progress bar showing the percentage of data downloaded, file size, and download rate. When I close the session, debian is still running and downloading. Fine. But When I close and reopen a session, how can see which amount of data was downloaded, using a linux command ? thanks.

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• customErrors="RemoteOnly" not working properly in Server 2008

  - by Atomiton

  It would appear that on my brand new Windows Server 2008 with IIS7, customErrors is not working. We have customErrors set to RemoteOnly in the web.config on our Asp.Net sites and applications. However, no matter what we do, it would appear that our sites act like it's set to On and we can't get any detailed messages showing up on our applications when remoted into our servers. I'm not entirely sure how to trace where this is being overrided, or if there is something in the way the server is configured that would make the server think the request is internal? How does this actually resolve correctly, anyway? Any help is appreciated... Our network admin has added domains to our hosts file to direct applications to the IP address.

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• Fix Firefox Not Scrolling with Up/Down Arrow Keys or Home/End Keys

  - by The Geek

  If you’ve encountered a problem where your Firefox installation no longer scrolls when you use the up or down arrow keys, and even the Home or End keys don’t work anymore, there’s an easy fix. When this problem happens, you’ll notice that moving the arrow keys around just moves the cursor around the page. Annoying! The problem is because you tripped the Caret Browsing feature at some point, and accidentally hit Yes. To fix this, you can just hit the F7 key again. Or, if you want to do it the about:config way, filter by accessibility.browsewithcaret and make sure it’s set to false. Remember, you can double-click on any boolean value to toggle between true and false. Similar Articles Productive Geek Tips Keyboard Ninja: Scrolling the Windows Command Prompt With Only the KeyboardShow Shortcut Keys in ScreenTips in Visual Studio 2003Show Shortcut Keys in ScreenTips in Visual Studio 2005Future Date a Post in Windows Live WriterDisable the Irritating Sticky / Filter Keys Popup Dialogs TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips DVDFab 6 Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 Need Help with Your Home Network? Awesome Lyrics Finder for Winamp & Windows Media Player Download Videos from Hulu Pixels invade Manhattan Convert PDF files to ePub to read on your iPad Hide Your Confidential Files Inside Images

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• How can I tell which interface my Supemicro IPMI is piggybacking on?

  - by lorin

  I've used IPMI before, but only on servers where the IPMI interface had a dedicated ethernet port. I've got an Ubuntu 10.04 server with two ethernet cards, which is supposed to have an IPMI interface on it (the motherboard is a Supermicro H8DMR-I2). From what I understand, the IPMI interface is piggybacking on one of the two NICs. Is there any way I can tell which NIC the IPMI interface is piggybacking on? Using ipmitool I've tried to set the IP address on the IPMI interface for the subnet for eth0, and then the subnet for eth1, and it's never reachable. (Can you even reach an IPMI interface from the same NIC it's piggybacking off of, or do you need to try connecting from a different machine on the network?) Also, is there anything special I need to do to enable it? I can access the IPMI interface locally using "ipmitool".

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• Sql Server 2005 cluster - unable to rename to old server name

  - by Paul2020

  We have a sql 2005 cluster on W2K8 cluster. It is a named instance say SRV1\A. Then I built a new W2K8 (with a diff cluster service name) but the same service account. Then I installed a new sql 2005 cluster say SRV2\A. Now when I bring down the sql server resources on SRV1 and try to rename SRV2\A to SRV1\A through the cluster admin, I get the error the network name already exists. I have tried bringing an old cluster and installing a new cluster with the same name and it works. Why am I not able to rename the name? Any advice would very helpful.

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• allowing 2 VM's to communicate RED HAT 64 bit

  - by ????? ????????

  My physical PC is running 2 VMs on virtualbox. Both of the VM's are linux 64 bit. I am going through this tutorial: http://www.cyberciti.biz/faq/rhel-centos-fedoracore-linux-network-card-configuration/ in order to expose both of their IP's so that they can speak to each other. Mike Schwager November 25, 2009 at 10:55 pm Whoops! In section 3, you forgot about editing /etc/hosts. I believe RedHat comes complete with the system’s host ip address set up in /etc/hosts. Don’t forget to give it a look. I agree with Mike because after I looked into the /etc/hosts files, it has just default localhost stuff in it. How should I reconfigure the hosts file?

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• Building Web Applications with ACT and jQuery

  - by dwahlin

  My second talk at TechEd is focused on integrating ASP.NET AJAX and jQuery features into websites (if you’re interested in Silverlight you can download code/slides for that talk here). The content starts out by discussing ScriptManager features available in ASP.NET 3.5 and ASP.NET 4 and provides details on why you should consider using a Content Delivery Network (CDN).  If you’re running an external facing site then checking out the CDN features offered by Microsoft or Google is definitely recommended. The talk also goes into the process of contributing to the Ajax Control Toolkit as well as the new Ajax Minifier tool that’s available to crunch JavaScript and CSS files. The extra fun starts in the next part of the talk which details some of the work Microsoft is doing with the jQuery team to donate template, globalization and data linking code to the project. I go into jQuery templates, data linking and a new globalization option that are all being worked on. I want to thank Stephen Walther, Dave Reed and James Senior for their thoughts and contributions since some of the topics covered are pretty bleeding edge right now.The slides and sample code for the talk can be downloaded below.     Download Slides and Samples

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• How to debug xsane "no devices available" error on 64 bit Ubuntu 10.04

  - by BD at Rivenhill

  I have a Brother MFC-J615W printer/scanner and I wish to use the scanning feature across a network with a computer running 64-bit Ubuntu 10.04. I have installed the drivers from the Brother website and followed all of the instructions, and printing works fine, but xsane (installed from repositories) produces a popup with the message "no devices available" on startup. I recently had success with a similar approach when installing drivers for a Brother MFC-495CW on 32-bit Unbuntu 9.10, so I am aware of issues such as requiring root access if the driver permissions are not set correctly, but running xsane as root does not solve this problem. Are there any tools available to debug this problem further or does anyone have advice on how to proceed?

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• Linksys WRT54G2 not showing connected PC's in DHCP table

  - by Moose

  For some reason all of a sudden my linksys WRT54G2 no longer shows PC's connected in the DHCP table. It was being touchy then all of a sudden they all just disappeared. It showed 2 of the 4 connected then it showed the other 2 then it only showed 1 and then it was showing none. I seem to be having a connection reset every 30-60 minutes also not sure if that is related to the router going bad or if it is just comcast being it's typical crappy self. I have tried to reset my router and my cable modem and both problems still seem to keep happening(no PC's in table and connection reset every 30-60 mins). Now I know the router doesn't store clients after a router reboot but they normally show up within a matter of minutes for me in the past. Before anyone asks yes all devices on the network are using DHCP and not static. Could this be a sign of the router starting to go bad?

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• Why doesn't update-manager allow me to upgrade distribution?

  - by spoulson

  I have an Ubuntu 9.04 PC behind a corporate firewall and proxy server. This requires that in order to get update-manager to fetch and apply updates, I must set the proxy and authentication settings in the Synaptic network configuration. Once done, I can check for updates and things work smoothly (except I don't get popup notifications of new updates, must manually check periodically). However, distribution updates just don't show up in update-manager, such as the newly released 9.10 Karmic Koala. I had the same issue in upgrading 8.10 to 9.04 and solved it by downloading and upgrading from the 9.04 ISO. What do I need to do to upgrade to 9.10 using the standard update-manager UI?

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• Path of md device wrong after reboot

  - by flammi88

  I have to set up a software raid (level1) on a Ubuntu server 12.04. It should serve files in the network via Samba. The server has the following disks: 250gb Sata hdd (Ubuntu is installed on that drive) 2 TB Sata hdd (first disk in raid array, data disk) 2 TB Sata hdd (second data disk) I created one partition on every data disk with the type Linux raid autodetect. In the second step I created the raid1 with the following command: mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1 After that, I added the array to the mdconf: mdadm --examine --scan >> /etc/mdadm/mdadm.conf The problem is: After a reboot the array is not available on the path /dev/md0. Instead of that it gets reassembled as /dev/md/0 but it is not very reliable. Has anybody a solution for this issue?

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• Accessing IPv6 router interface from a minimal Fedora installation?

  - by Zack

  I've recently installed Fedora 16 and am trying to set up a simple apache server. The only problem I've run into so far is that I'm unable to access my router's web interface from any box on my network. It assigns addresses via dhcp, and the router always responds to a ping. The server is also picking up an IP from the router on the proper subnet. Now, all I really need to do is forward a port, however I am receiving "Unable to connect" through the web interfaces and "connection refused" via telnet. What are my options, and how might I go about troubleshooting this? Will I need the server's ip to be static in order to change these settings? The router is a "Netopia" model, if that helps.

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• Cannot Access Web Interface on HP 2510G

  - by Stephen

  I am currently setting up a new infrastructure with HP 2510s as edge switches and an HP E5406 as the main switch. I also have a DHCP and DNS server running on the same network. When i first set up one of my 2510 switches, I gave it a static IP through the console and then went to the web interface to continue my configuration. Later, I realized that I assigned it the wrong IP address, so i went through the web interface and changed the IP address to the correct one. Now, I can't access the web interface. I can telnet to the switch on the new IP address, but the web interface will not load. If I switch from static IP to DHCP, it loads the web interface. Any ideas on what could be causing the web server in the 2510 not to load with the new static IP address?

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• FotoJeff.com | My Photography Blog

  - by Jeff Julian

  I have been recently been doing more photography and Flickr was only allowing me to do so much with the images in displaying them.  No customization of skin, no page grouping, no post like pages.  So I decided to host a WordPress blog to host my images.  I really wanted to try WordPress to see what features single-hosted blog products offer that our multiple-hosted blog system could take advantage of.  So far the product is very cool, I can see how such a large developer network would help produce such cool “apps” for WP.  The product makes if very easy to make changes to your hosted environment that would be a little scary for a multiple blog host.  I need to compare features for their hosted solution. Any who, FotoJeff.com is my new photography blog home.  I have been working with the Kansas City Rescue Mission a lot lately so most of my shots are for them. FotoJeff.com – Photography Blog of Jeff Julian My hope is to make this blog again my technology blog, Staff of Geeks our Geekswithblogs.net announcement blog and FotoJeff.com my photography blog.  I need to start dog fooding my thoughts on blogging and keep the noise down (by making more noise with this post :D). Technorati Tags: FotoJeff.com,Photography,Blogs,Geekswithblogs

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• Windows Azure Virtual Machine Test Drive Kit

  - by Clint Edmonson

  The public preview of hosted Virtual Machines in Windows Azure is now available to the general public. This platform preview enables you to evaluate our new IaaS and Enterprise Networking capabilities. Once you have registered for the 90 Day Free Trial and created a new account, you can access the preview directly at this link: https://account.windowsazure.com/PreviewFeatures If you’ve been to any of my presentations lately, you’ll know that I’m fired up about these new offerings. As I’ve worked through some scenarios for myself and with my customers, I’ve been collecting the resources that helped me to ramp up. Here’s a collection of links to the items I’ve found most useful: Core Resources Digital Chalk Talk Videos – detailed technical overviews of the new Windows Azure services and supporting technologies as announced June 7, including Virtual Machines (IaaS Windows and Linux), Storage, Command Line Tools http://www.meetwindowsazure.com/DigitalChalkTalks Scenarios Videos on You Tube – “how to” guides, including “Create and Manage Virtual Networks”, “Create & Manage SQL Database”, and many more http://www.youtube.com/user/windowsazure Windows Azure Trust Center - provides a comprehensive of view of Windows Azure and security and compliance practices http://www.windowsazure.com/en-us/support/trust-center/ MSDN Forums for Windows Azure http://www.windowsazure.com/en-us/support/preview-support/ Microsoft Knowledge Base article Microsoft server software support for Windows Azure Virtual Machines Videos Deep Dive into Running Virtual Machines on Windows Azure Windows Azure Virtual Machines and Virtual Networks Windows Azure IaaS and How It Works Deep Dive into Windows Azure Virtual Machines: From the Cloud Vendor and Enterprise Perspective An Overview of Managing Applications, Services, and Virtual Machines in Windows Azure Monitoring and Managing Your Windows Azure Applications and Services Overview of Windows Azure Networking Features Hybrid Will Rule: Options to Connect, Extend and Integrate Applications in Your Data Center and Windows Azure Business Continuity in the Windows Azure Cloud Linux on Windows Azure Blogs Understanding Windows Azure Virtual Machines An Overview of Windows Azure Virtual Network Virtual Machines and Windows Running SQL Server in a Windows Azure Virtual Machine Support for Linux Virtual Machines on Windows Azure

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• Distributing Files using a Group Policy on Windows Server 2003

  - by tonedeath

  A piece of software that we use at our office has recently moved to a new licensing system. This means that from now on a new set of license key files will need to be distributed to each of our 25 client installations every year. All of the clients run XP and are part of an AD domain controlled by a Windows 2003 DC. I'm already using group policies to deploy software updates. I gather that this is possible with Group Policy Preferences in Server 2008. I'm just looking for a good method using Server 2003. The same set of files need copying to each client. I also have them hosted on a network share accessible by each client. I'm more of a *nix person, so I'm not particularly up on scripting in a Windows environment.

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• SSRS Subscription Fails

  - by Chad

  Our SSRS server is not executing a subscription correctly. (Only subscription we have btw) We created a subscription to export a report as an excel file to the file system. Tried running the job that gets generated, and this error happens 'EXECUTE AS LOGIN' failed for the requested login 'NT AUTHORITY\NETWORK SERVICE'. The step failed. It's not the most helpful in tracking down what exactly it was trying to do. EDIT Digging further into the logs I also get these errors w3wp!extensionfactory!f!7/30/2010-14:29:26:: w WARN: The extension Report Server FileShare does not have a LocalizedNameAttribute. w3wp!extensionfactory!11!7/30/2010-14:34:48:: w WARN: The extension Report Server Email does not have a LocalizedNameAttribute.

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• Cyrus IMAP: Unable to connect to remote host: Connection refused

  - by Nick

  I'm working on setting up a Cyrus 2.2 IMAP server on Ubuntu Server 9.04. If I telnet from the server itself: # telnet localhost imap I get: * OK IMAP Cyrus IMAP4 v2.2.13-Debian-2.2.13-14ubuntu3 server ready Which is what I should be seeing. If I try from another machine on the network: telnet 192.168.5.122 imap I get: telnet: Unable to connect to remote host: Connection refused To the best of my knowledge, there is no firewall running on the box. I've tried restarting the saslauthd and cyrus2.2 daemons, with no effect. What else can I try?

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• Ping only works after about 30 seconds

  - by Ricardo Polo

  Today I am working on this issue and I would love your ideas. There is a network with something like this LAN 1 -- WAN CHANNEL--- LAN 2 The LAN 1 have two segments. When I make a ping from LAN 1 segment 1 it works like a charm. When I make a ping from LAN 1 segment 2 I have no ping, but after about 30 seconds of continues ping (ping -t) it start to work perfect. After some time of no activity with the destination host the issue happens again. Tracing the route packets stops in the last router before the target. This is the first router in LAN 2 after the WAN channel. In the next screenshot you can see thie issue, the first ping is before a continuos ping and the second one is while continous ping is running. Thank you in advance

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• Gist (or other git-backed pastebin) on my own Server?

  - by Jim Dennis

  Does anyone know of a package to allow me to run a clone of gist on my own internal servers? I'd like to encourage our dev. teams to use a GIST like pastebin (with syntax highlighting and, preferably, with a git-based or git compatible backend). However, I want the code to remain within our network. Suggestions? (By the way, I've glanced at things like pygist but that's a client rather than providing the pastebin server side functionality. I suppose one option would be to add support for a Git backend to: pasttle

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• Should I install an AV product on my domain controller?

  - by mhud

  Should I run a server-specific antivirus, regular antivirus, or no antivirus at all on my servers, particularly my Domain Controllers? Here's some background about why I'm asking this question: I've never questioned that antivirus software should be running on all windows machines, period. Lately I've had some obscure Active Directory related issues that I have tracked down to antivirus software running on our domain controllers. The specific issue was that Symantec Endpoint Protection was running on all domain controllers. Occasionally, our Exchange server triggered a false-positive in Symantec's "Network Threat Protection" on each DC in sequence. After exhausting access to all DCs, Exchange began refusing requests, presumably because it could not communicate with any Global Catalog servers or perform any authentication. Outages would last about ten minutes at a time, and would occur once every few days. It took a long time to isolate the problem because it was not easily reproducible and generally investigation was done after the issue resolved itself.

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• DNS Settings in Cisco Wireless Lan Controllers

  - by Braden

  The WLC is a 2100 series and I have looked back and forth through the entire web interface. Originally the idea was that the gateway should be the DNS controler and the WLC pointed directly at the gateway. For some reason, random clients are having DNS specific issues when it comes to seeing certain shares around the network. The problems are also very intermittent. Aside from going to each box and implementing a static DNS is there ACTUALLY a DNS setting lodged into the WLC settings (and I am being a numpty and can't find them) or am I stuck with performing the config 1 by 1?

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