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• KVM guest storage difference with NBD and NFS

  - by WojonsTech

  I am setting up my own little private cloud for my own use maybe for a project or to. I am using linux kvm on debian 6. I have 3 servers 2 of them for compute nodes and 1 storage node. I would I have already installed kvm made a few test machines got my networking setup. I have 2 nics on each server 1 nic is for web traffic other nic is for network traffic. My first Idea was to use NFS for storing the guest machines which can range in size, maybe 8gb maybe 100gb, it just depends. I was doing have heard of nbd before seems like it could work but I dont know what the performance differences are and if it will effect my enviroment, nfs looks like it will be easier to use.

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• SFTP not working, but SSH is

  - by Dan

  I've had a server running CentOS for a few months now. A few days ago, I stopped being able to connect to it over SFTP. I've tried from multiple computers, OSes, clients, and internet connections. I can SSH in just fine, though. For example, Nautilus gives me this: Error: DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken. Please select another viewer and try again. I was under the impression that SFTP was just pure SSH, and if one worked, the other would, and vice-versa. Clearly that's not the case, though. What could I have done wrong?

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• Cannot send email from EC2 instance on port 587

  - by Tahsin Mostafiz

  I have written a mail service for our flask application that uses Celery and RabbitMQ to send emails (using gmail). I have got the celery consumer and producer communicating okay but I cannot get to send send emails. I am getting a socket.error: [Errno 101] Network is unreachable. I think this means that AWS is blocking port 587 - even though in my security group I opened both ports 587 and 25 (inbound and outbound). Any reason why this is happening? Any help will be highly appreciated.

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• Adding Command-Line Switches To Windows Shortcuts

  - by jaytea

  Is there a way to, in general, create a Windows shortcut to a file and instruct Windows to pass certain switches to the application before passing the filename? For example: I have an Excel file, abc.xlsx. If I want to create a shortcut to open this file read-only, I would change the target to "C:\Program Files\Microsoft Office\Office12\EXCEL.EXE" /r abc.xlsx, but this fails when another person on my network opens the shortcut and their EXCEL.EXE is not in that same folder. Surely there's a way to tell Windows to pass the /r switch without supplying the path/filename of the application that is supposed to open the file?

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• Where does traffic shaping typically take place?

  - by eekmeter

  As part of upgrading our network infrastructure we are looking to traffic shape our bandwidth since we only have about 3Mb down / 1 Mb up. We're looking to prioritize it so that web browsing gets priority and in the future some VOIP might be added in as well. Internal LAN traffic doesn't need to be controlled just our outbound connection. I've been looking at Cisco hardware and it seems that several of their products do shaping at the core switch, firewall, and router level. I'm wondering where does shaping normally take place? Is it normally done at the router, core switch, or firewall?

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• is using Hosts for resolving a sql-server more performant?

  - by Ice

  Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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• How to synchronize tasks on multiple computers

  - by SysGen

  I would like to be able to run similar tasks on several computers that must be precisely synced. More specifically I need 4 laptops to be synced, probably over local network, and I need to use one of them to start a task (play a video) on all of them at the same time (different video files on different laptops). All of them are running Windows. Is there a third-party software or any easier way to do so over LAN without significant delay? I need virtually no response time - if there would be a single video streaming on all laptops then people should not recognize the delay.

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• Solution to: Hotmail Senders receiving NDR : “550-Please turn on SMTP Authentication in your mail client…”

  - by Tony Yustein

  Original question is here original question I can not answer to that question because the system requires me to have 10 credits, very nice.... This error is based mostly on mobile devices, mostly on iPhones and mostly on mobile networks. This is how much I have narrowed it to. I believe: Hotmail checks where your are connecting from If it is a mobile network it requires additional security for sending messages but the default iPhone config does not have this option for hotmail if the user creates the hotmail account on the iPhone with SMTP AUTH enabled manually it might solve the situation Cheers, Tony

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• Outlook '10 hangs often, IMAP sync

  - by user23150

  We have 3 employees using IMAP to sync with their Desktop and Android Phones. Two are using 70% of their accounts storage, another is using 80%. They all have similar counts on folder structure, etc. The employee with the 80% storage is constantly having Outlook freeze on them for up to 5 minutes at a time. I realize this is Outlook connecting and doing activity on the server, but no one else has this problem. In fact, one user with the 70% storage used uses a very slow laptop, and doesn't have freezing issues. The network is the same, the settings are the same - at a loss how to proceed? Obviously "Outlook is a crummy IMAP client" doesn't help management...

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• Squid randomly stops serving requests. How can I resolve this issue?

  - by Vijay

  The squid (2.7) proxy that I have running on ubuntu 8.10 stops accepting new requests after being online for a while, due to reasons that I can't discover. However doing a squid -k reload resolves the problem immediately. Now I manually run this command by monitoring the log and if i don't see any activity for 5 minutes I reload the config. Now on my quest for a solution I had several ideas: diagnose the root cause and eliminate it setup a script to automatically reload script if no new entries in access.log for the past 3 minutes painstakingly upgrade server to newer ubuntu version while keeping network offline or during off hours to minimize downtime. so i thought I would turn to you for solutions to option 2), as I do not understand squid enough for 1), and I'm avoiding 3) as long as i can. so can ideas?

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• Bacula configuration for clients that are turned on and off randomly

  - by Rastloser

  I'm evaluating Bacula as a centralized backup tool for a small network where users will turn machines on and off unpredictably. Some of the headless Linux boxes I need to back up are intended to be turned off by pressing the on/off-button on the case, without any way of telling the user to wait for a backup job to finish. So, we don't know when backup jobs may run (anacron might help with this, right?) and we don't know whether they'll be allowed to finish. Is Bacula a reasonable choice for such an environment?

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• When one DC crashes, TFS 2012 stops working

  - by blizz

  We have two Windows 2008 domain controllers. We installed the second DC only a few months ago. We also have a TFS 2012 server on the network. Today, when the older DC crashed, TFS stopped working completely. Local users received messages such as "You are not authorized to access ServerName\Collection". Remote users received messages such as "The server was used in your last session, but it might be offline or unreachable". So my question is, why did TFS not use the second, newer DC instead of just crashing along with the first DC?

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• What constitutes "commercial purposes"?

  - by RoboShop

  I'm looking at this license. It says that I can use it for "non-commercial purposes". What does that mean? I see in Stack Exchange, under Network Profile there is that graph that tracks your points across your Stack Exchange accounts. It uses a control called HighCharts which have a paid and Creative Commons licensed version. So would Stack Overflow constitute a commercial site? We don't pay to use this site, but obviously the site makes money from ads, etc. Then again, there's a lot of sites that have ads who won't necessarily make a profit, it may only be subsiding their costs. But even then, you could argue that even if it is only subsiding their costs, a lot of IT companies run at a loss in order to build a big enough customer base. So where is the line here? Is it any website on the internet? Is it any website that has ads? Is it any website that turns over a profit?

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• Ubuntu 10.4 No internet

  - by Keeper780

  I have Ubuntu 10.4 dual booted with Windows Vista on a work Lenovo R61 laptop. The home and work wireless connection were working fine. I lost all internet connection at work. The IT guy clearly knew nothing about Linux. Since he 'fixed' it get nothing, no wlan signal the Network manager icon was gone, no internet. I still have the live disc and if I run from the live disc the connections are there and everything works perfectly. How do I restore the internet easily on my laptop. I have been using Linux for 3 Years but I am still a bit of a newbie, this is the first major problem I've had in three years. It's driving me nuts. Thanks

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• safe to setup NAS in virtual image with web server?

  - by Erik

  My current setup is Ubuntu Desktop, running Apache + MySQL + PHP stack. I use this image to host my small website to the outside world. I want to now run a virtual machine on the box, that will act as the FreeNAS box for my internal network. This sounds like a bad idea if the website gets hacked/attacked. Should I just give up and grab a dedicated machine instead? Can I instead virtualize the web server and NAS side by side on this machine?

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• How do I justify to my management that we need a bandwidth upgrade?

  - by Sandeep

  I work in an office with a 8mbps line and about a 100 people. Our internet has slowed to crawl over the past few months, as we added headcount. However, using speedtest.net or other sites, still shows bandwidth as 8mbps. Now, how do I justify to management that we indeed need to upgrade our bandwidth ? Please note that I dont have access to our main routers or any network equipment. I can only use my system (windows+linux dual boot) to make a case for a reasonable justification. help!

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• Chromium never stops loading iGoogle

  - by regulatethis

  I almost always keep a tab open on google.com/ig. Recently I've noticed that the "loading" animation for that tab never stops spinning, even though the page appears to be fully loaded. Even though there's no direct problem with this, I find the animation really distracting and to be honest it's driving me crazy. I've done a few things to try to figure this out. I've removed every single one of my gadgets (so my igoogle is blank), but that made no difference. I've disabled adblock and scriptno. nothing. I've watched the network console in developer tools to look for resources that haven't finished loading, but it looks like everything is done. I'm all out of ideas. For my sanity's sake, please help.

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• SQL Server 2008 R2 installation Error "Not all privileges or groups referenced are assigned to the caller"

  - by CodeSlinger

  Im getting an error half way through an SQL Server 2008 r2 installation. The error states Not all privileges or groups referenced are assigned to the caller. it asks to retry or cancel. Upon trying both, the error message returns and I must cntrl-alt-delete to end the process. I have checked all permissions associated with local account, network domain account and ran installation as administrator. I have searched on the web and other people are having this problem too but I cant find a solution. so I turn to the experts, anyone encounter this error??

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• How to forward traffic using iptables rules?

  - by ProbablePattern

  I am new to iptables and I have been doing Google searches for a few days now without finding a good solution to this problem. I have computer A with a public ip address (say 192.0.2.1) that can access the Internet unrestricted. I have another computer B with a private ip address (192.168.1.1) that can only access computer A. How do I use iptables to forward network traffic from B through A to the Internet? I need to use http, ftp, and https in order to use apt-get with sudo. Both computers run Ubuntu linux. I have tried using Squid but I think it is far too complicated for what I need to do.

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• Keeping folder of files in sync over 3 machines

  - by Wizzard

  Morning, Got 3 machines that have user content on them, which I need to keep in sync. This is a 3 way sync. Currently I run rsync but we just don't handle deletes. Have looked at something like gluster, but that seems a little over the top Any other software out there to do a 3 way sync, or a good network file system...? There is for web servers so we don't want a slow / IO hungry process. 3 servers... user content could be added to 1 and needs to be moved to other two.

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• Very small image for rebuilds

  - by Deon

  I worked at a place last year that had a very small image for Windows XP re-builds. It was two Norton GHO files, totalling about 2-3 GB. This is how it worked: Boot into Norton Ghost Map to the network share where the images lived Apply the image to the workstation Reboot It would then load into Windows Setup Enter the Domain Admin credentials so it can join the domain That's it... it would then reboot into Windows and the image was complete. How did they make an image so small? Did they perhaps kick off a Windows install and create an image then? I particularly liked how it required no user input other than a domain admin login.

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• CSS file not served by IIS 7.5 after multiple clear cache refreshes in a row in browser

  - by KenB

  We are experiencing an interesting issue with IIS 7.5 static caching and a css file. When we use IE to hit the page in question everything works fine - 200 OK on css file. When we refresh the page it works fine - 304 Not Modified on css file. When I refresh again with control key it reloads fine - 200 OK on css file. Now if I do a control key + refresh multiple times in a row really fast the css fails to load and in the developer tools network it says "Loading..." for the css file and it hangs never coming back. Any ideas?

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• How can I tell if a host is bridged and acting as a router

  - by makerofthings7

  I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is configured correctly. What IP, ICMP, or SNMP (etc) tricks can I use to poll the hosts and determine if the host is acting as a router? I'm assuming this test would presume I know the target IP, but in a large network with many subnets, I'd have to test many different combinations of networks and see if I get success. Here is one example (ping): For each IP in the DMZ, arp for the host MAC Send a ICMP reply message to that host directed at an online host on each subnet I think that there is a more optimal way to get the information, namely from within ICMP/IP itself, but I'm not sure what low level bits to look for. I would also be interested if it's possible to determine the "router" status without knowing the subnets that the host may be connected to. This would be useful to know when improving our security posture.

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• Safe to use high port numbers? (re: obscuring web services)

  - by sofakng

  I have a small home network and I'm trying to balance the need for security versus convenience. The safest way to secure internal web servers is to only connect using VPNs but this seems overkill to protect a DVRs remote web interface (for example). As a compromise, would it be better to use very large ports numbers? (eg. five digits up to 65531) I've read that port scanners typically only scan the first 10,000 ports so using very high port numbers is a bit more secure. Is this true? Are there better ways to protect web servers? (ie. web guis for applications)

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

  - 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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