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  • How much overhead is there in persistent connections?

    - by nynex
    Ok so I'm musing over a little side project I want to start. Essentially its a multi-session web based FTP client. Multi-session in that you can log into several FTP servers at the same time and perform operations like moving a file from one FTP server to another. I'm doing this mainly to brush up on the new webdev technologies, particularly websockets. I'm using node.js + socket.io to keep a persistent bi-directional connection between the web browser and the web server. The web server will also have persistent connections to each FTP server the user has logged into. So if there are 100 concurrent users each logged into 5 ftp accounts, the web server will have 100 websocket connections + 500 ftp connections. Is servicing 600 connections a lot? I know it depends on the hardware resources of the server but is something like this doable on a budget? Are there more efficient means of doing something like this? I know its unlikely that this project will really get popular but I want it to scale well regardless. Thanks for any help, I've still got a lot to learn.

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  • Sonicwall site-to-site can not access remote network

    - by vpnwizard
    I have 2 SonicWall devices (tz100) in 2 different geographical locations. They are connected to each other using site-to-site vpn connection and this works just great. Device A network - 192.168.1.0/24 Device B network - 192.168.2.0/24 When I connect to one device, I can access, from my computer, anything on that specific subnet. However, I am unable to view anything, from my computer, on the other network. Is there a setting somewhere that will forward my requests to the other subnet? Example - I VPN into Device A, but would like to get to a server which is on the Device B network (192.168.2.0/24)

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  • Improve performance on Lync desktop sharing

    - by Trikks
    I'm using Lync 2010 server to handle some clients communication and screen sharing. The biggest issue is the performance with screen sharing, it is of rather high quality but the frame rate is very poor. I have been reading and searching a lot on the subject and 95% of all topics is about bandwidth, we have a 200/200 MBit Internet connection solely for this application. Also my test machines runs on an internal gigabit lan. The speeds between all boxes is hysterically fast. Next step was to ensure that there where some profiles for different bandwidths, so i registered some New-CsNetworkBandwidthPolicyProfile -Identity 50Mb_Link -Description "BW profile for 50Mb links" -AudioBWLimit 20000 -AudioBWSessionLimit 200 -VideoBWLimit 14000 -VideoBWSessionLimit 700 New-CsNetworkBandwidthPolicyProfile -Identity 100Mb_Link -Description "BW profile for 100Mb links" -AudioBWLimit 30000 -AudioBWSessionLimit 300 -VideoBWLimit 25000 -VideoBWSessionLimit 1500 Nothing fancy happend here either. Non of the test boxes have anything from Norton installed, they doesn't have any firewalls running (nor does the Lync server), all fences are down in this environment just for the testing. Is there any thing that I may have missed to improve the quality of this? Thanks

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  • File sometimes doesn't download from my website

    - by kylex
    When I attempt to download this file, sometimes it only downloads about 700KB (the file is 40MB) then I get the message that the download is complete. If I try to download the file again, it works properly. The problem seems prevalent in IE, although I've had it happen in Chrome sometimes too. I have the following code: <input type="button" value="Agree to Terms and Download" onClick="location.href='/downloads/setup.exe';" /> If it matters, this is over a secure connection. I also tried zipping the file, and had the same issues.

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  • Install a i386 printer driver into an amd64 distribution or how can I find a good printer based on features?

    - by Yanick Rochon
    Hi, I just bought a Lexmark Interpret S408 all-in-one printer. The box said that it supported Ubuntu 8.04, but I told myself it should work with Lucid... well no. The only driver I have found is for i386 while I have a amd64 image installed; the architecture is incompatible. So, the quesiton is : Is it possible to install that driver anyway, somehow? Or do I need to take that printer back to the store and buy another one? If the latter is the only alternative, I need a printer that has wireless connection capability can do color printing is of good price (less than $200 CAD) Thank you for your answers, help, and tips. ** UPDATE ** The driver was given in the form of deb package (for Debian distributions) and I managed to extract the actual deb package driver out of the install program. I ran sudo dpkg -i --force-all lexmark-inkjet-09-driver-1.5-1.i386.deb and the driver installed, and I was able to print something out. But that pretty much ends there; I cannot access anymore of the printer settings, etc. (i.g. scanner, fax, wifi settings, etc.) I should suffice for now as I'm satisfied with the printer's features (and size, and prince), but if I could have a full-linux-supported printer like that one, I would return this one in exchange for the other.

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  • Setting up a externally facing server on Windows. How do i setup DNS/Nameservers?

    - by Jason Miesionczek
    So i have a domain name that i would like to host from my static ip internet connection. I have windows server 2008 r2 installed, and dns setup. The dns server is currently behind a firewall, and i have the appropriate rules to allow traffic to reach it. My question is, what entries do i need to create in the DNS so that i can have some nameservers to use at my domain registrar, so that the domain correctly points to the server? I know that most domains have nameservers like ns1.domain.com, ns2.domain.com, etc. What would i point those to in my DNS?

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  • Server suddenly running out of entropy

    - by Creshal
    Since a reboot yesterday, one of our virtual servers (Debian Lenny, virtualized with Xen) is constantly running out of entropy, leading to timeouts etc. when trying to connect over SSH / TLS-enabled protocols. Is there any way to check which process(es) is(/are) eating up all the entropy? Edit: What I tried: Adding additional entropy sources: time_entropyd, rng-tools feeding urandom back into random, pseudorandom file accesses – netted about 1 MiB additional entropy per second, problems still persisted Checking for unusual activity via lsof, netstat and tcpdump – nothing. No noticeable load or anything Stopping daemons, restarting permanent sessions, rebooting the entire VM – no change in behaviour What in the end worked: Waiting. Since about yesterday noon, there are no connection problems anymore. Entropy is still somewhat low (128 Bytes peak), but TLS/SSH sessions have no noticeable delay anymore. I'm slowly switching our clients back to TLS (all five of them!), but I don't expect any change in behavior now.

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  • Cannot SSH into Amazon EC2 instance

    - by edelwater
    I read: Cannot connect to ec2 instance http://stackoverflow.com/questions/5635640/cannot-ssh-into-amazon-ec2-instance Amazon EC2 instance ssh problems etc... But could not fix it: suddenly (after a year of service, no changes on my winscp settings) it gives me "network error connection timed out" (im using ec2-user) (also from the amazon console). Log FILE: http://pastebin.com/vNq6YQvN All Sites that run on it run fine port 22 is allowed (never changed it) (security group) using the correct ec2-user and domain via my winscp / putty i can connect to other hosting (via ssh) update: SOLVED. I spend 2 days without looking at my own IP address .... (since it did not change the past 3 years....). Your comments made the spark in my brain. thank you so much. (and only now i find dozens of discussions from angry users that the static addresses from my provider are changed to dynamic ones: http://gathering.tweakers.net/forum/list_messages/1501005/12 ...)

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  • Why doesn't my PHP install see the MySQL extension?

    - by Evan Padd
    So I just set up PHP (Version 5.2.17), MySQL (5.5.28), and Apace (2.2) on my Windows 7 computer. I want to test a mysql connection, but the mysql extension is apparently not loaded (based on phpinfo()). Here's what I did: Changed the extension dir in the php.ini (extension_dir = ".;c:\php\ext") and uncommented the extension=php_mysql.dll line Copied libmysql.dll to the Apache's bin directory Added C:\php to the system's $PATH Restarted the server, then the computer And it's still not working. What did I miss? EDIT: I'm looking through phpinfo()'s outout and it says: "Server API | Apache 2.0 Handler" and I'm running 2.2. Is that a problem?

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  • Changing path to basedir of mysql

    - by shantanuo
    When-ever I need to start mysql from command line, I need to cd to the base directory and then use mysql command as shown below: # cd /home/ec2-user/percona-5.5.30-tokudb-7.0.1-fedora-x86_64/ # ./bin/mysql Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 3 mysql> How do I start mysql simply by typing "mysql" at command prompt? I tried to export the path but it did not work. export path=$PATH:/home/ec2-user/percona-5.5.30-tokudb-7.0.1-fedora-x86_64/bin/

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  • file downloaded via firefox and curl have different size

    - by Arash Mousavi
    When I download a file from this link by Firefox its size is 74580 B, But when I download it by curl with exactly all of header was sent by Firefox its size is 79891 B (I copied all header from Firefox and paste it in curl command). what is the problem? If you need any additional data ask me in comment. My curl command: curl --header 'Host: members.tsetmc.com' --header 'User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0' --header 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' --header 'Accept-Language: en-US,en;q=0.5' --header 'Referer: http://www.tsetmc.com/Loader.aspx?ParTree=15131F' --header 'Cookie: ASP.NET_SessionId=pwzbckbdpjlzqj45vcdbd455' --header 'Connection: keep-alive' 'http://members.tsetmc.com/tsev2/excel/MarketWatchPlus.aspx?d=0' -o 'MarketWatchPlus-1393_3_14.xlsx' -L

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  • Trying to turn an WD Mybook 1TB to slave drive in PC

    - by Steph W
    Yes I realise that most external Hard Drives would not be transitioned into internal sitting Hard Drives, but unfortunately we broke the miniUSB connection that transfers the data from external Hard Drive to laptop. What we are TRYING to do now, is get the WD MyBook 1TB to funtion alongside (preferably as SLAVE) to my currently exsisting Desktop Hard Drive. both are SATA drives. We have the SATA power, and Data cables, and these are in place (but - somehow NOT working) - Help please - I am not computer illeterate, just don't know how to switch this so it works. How do I turn one into master, and the newer one (that was external) into the slave drive?

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  • How to route packets from Wi-Fi to Ethernet on OSX?

    - by Alexander Artemenko
    I have a trouble, configuring a home network. Here is how my devices are connected together: Internet     ? Wi-Fi Router ? MacBook     ? iMac ?ethernet cable? Synology NAS I have no ability to plugin NAS right into the Wi-Fi router. The problem is that MacBook does not see NAS, because they are in different networks — I configured Wi-Fi Router to serve 192.168.10.0/24 addresses, and configured iMac's ethernet connection to use 192.168.20/24 network. Is there a way to setup route from MacBook to the NAS?

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  • Netgear VPN can't access specific server

    - by Critologist
    I have a Netgear FVS318N configured with a VPN. I'm trying to access my call recorder with the provided software from another office. I've already setup the VPN connection, and it works. I can connect and ping the remote router and a few other things on the network. However, I can't ping or connect to my call recorder. If I move outside of the office network (i.e. connect directly to the cable modem or via a mobile hotspot), I can connect and ping the call recorder just fine. The office has a simple Linksys WRT54G router and is using AT&T Uverse. The remote location is using Charter Cable with a Netgear FVS318N. Has anyone ever encountered anything like this before? I've setup an identical VPN previously for a different client using similar hardware and never encountered this. Thanks in advance!

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  • Finding the shortest path through a digraph that visits all nodes

    - by Boluc Papuccuoglu
    I am trying to find the shortest possible path that visits every node through a graph (a node may be visited more than once, the solution may pick any node as the starting node.). The graph is directed, meaning that being able to travel from node A to node B does not mean one can travel from node B to node A. All distances between nodes are equal. I was able to code a brute force search that found a path of only 27 nodes when I had 27 nodes and each node had a connection to 2 or 1 other node. However, the actual problem that I am trying to solve consists of 256 nodes, with each node connecting to either 4 or 3 other nodes. The brute force algorithm that solved the 27 node graph can produce a 415 node solution (not optimal) within a few seconds, but using the processing power I have at my disposal takes about 6 hours to arrive at a 402 node solution. What approach should I use to arrive at a solution that I can be certain is the optimal one? For example, use an optimizer algorithm to shorten a non-optimal solution? Or somehow adopt a brute force search that discards paths that are not optimal? EDIT: (Copying a comment to an answer here to better clarify the question) To clarify, I am not saying that there is a Hamiltonian path and I need to find it, I am trying to find the shortest path in the 256 node graph that visits each node AT LEAST once. With the 27 node run, I was able to find a Hamiltonian path, which assured me that it was an optimal solution. I want to find a solution for the 256 node graph which is the shortest.

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  • Wi-fi signal with keeping the internet cable

    - by daGrevis
    So the situation is that I have Ethernet cable which provides internet to my computer. Thing I want is to have wi-fi connection in my house and Ethernet cable (like I have before) to use for my PC. I will use wi-fi for my laptop and mobile phone. I think I need router for that and I'm looking at Asus RT-N16 (suggested in Coding Horror) for it, but I am not sure. Is it the right thing for me and I will be able to get wi-fi signal and keep the Ethernet cable? I guess the system will be that current cable goes into router, router provides wi-fi signal and gives back new cable... or something like that. Thanks in any advice! And sorry if topic isn't in right site.

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  • ISP issue browsing "sonos.com" - need to diagnose and prove [closed]

    - by john
    I am unable to browse to a website "sonos.com" with my ISP (virgin). I have ruled out browsers, PCs, macs, routers, wifi, etc. Other ISPs (even other virgin connections in different areas!) supply this site no problem. I am 99% convinced there is a DNS issue lurking here. There is something fishy about the DNS for the site : What I notice is that online DNS sites tell me the right IP address for "sonos.com", but not for "www.sonos.com". Anyway when I type "sonos.com" the browser (any/all of the 4 I tried) fail to display the page. Firefox gives a "connection was reset" error. If I browse to sonos.com using the IP address it works OK. Browsing to www.sonos.com or sonos.com works fine with other ISPs of course. Questions: 1 Does anyone have any idea what might be going on here? 2 Any suggestions as to tools/monitors to help investigate/prove what is going on I can then take this up with virgin and/or sonos. Thanks

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  • Kill ssh background process after disconnect / timeout?

    - by keflavich
    I frequently use ssh tunnels to access VNC sessions on remote machines, but this is on my laptop so the connections break when I put it to sleep for the night. If I then try to re-open the connection in the morning, I have to manually kill the ssh session, otherwise I get this error: bind: Address already in use channel_setup_fwd_listener: cannot listen to port: 1202 Could not request local forwarding. The SSH command I'm using is this: ssh -N -C -f -L 1202:localhost:5900 name@server What's the best way to have the ssh tunnel die when it disconnects? Or reset?

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  • Wireless dropouts that only affect subset of devices

    - by jwaddell
    When watching videos streamed over WiFi from a NAS box (D-Link DNS-323) I am getting wireless dropouts. However they only appear to occur when I have left my laptop (Dell Inspiron 9300 running Windows XP SP3) running; the laptop is usually suspended if I'm not using it. The dropouts have occurred when streaming to a Netgear EVA8000 streaming device, and also to a PS3. I'm using a Netgear DG834G as the wireless modem/router. When a dropout occurs I go to the laptop and see that its wireless connection has also dropped out. The odd thing is that my wife's MacBook and my iPhone still maintain their connections. What could be causing this behaviour, and how do I go about fixing it?

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  • is there such a thing as a ip femtocell, and what does it do?

    - by The Journeyman geek
    My dad mentioned a co-worker suggested using a device, that might use cdma to route calls through IP to save costs on a certain overseas project we're on- since our home base is quite far from there. I've never heard of such a device, so if it does, i'm wondering, if its specific to particular ISPs, or if you can just pick one off the shelf, plug it into an arbitraty internet connection, and make calls using it and a cellphone of some sort? As you can tell, details are sketchy, so... if such a device dosen't exist, saying so might be a right answer ;)

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  • tunneling x11vnc through ssh on a non standard port to ubuntu computer tightvnc

    - by user72372
    I have been stuck with setting up my virtual desktop on my ubuntu laptop. I am running ubuntu to ubuntu with x11vnc I start the process on my laptop as follows: " ssh -L5904:localhost:5900 -p Port remoteuser@remoteip." That command works, then I start x11vnc server, "x11vnc -noncache -once -shared -rfbauth ~/.vnc/passwd." This command works and starts connection. Then I open another window on my laptop and type, export VNC_VIA_CMD='/usr/bin/ssh -2 -c aes128-cbc -x -p Port -l User -f -: %L:%H:%R %G sleep 20' (not sure if works). then I type, vncviewer -endcodings Tight -depth 8 -quality 1 -via IPofremotemachine -u remoteuser localhost:01. The first time it work but from now on it just gives me the vncviewer -help screen everytime. I type in the password for my remote machine and then shows -help screen for vncviewer. I think the problem is with Tightvnc viewer but don't know what. Please help. I got some info on www.vanemery.com/Linux/VNC/vnc-over-ssh.html?.

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  • WiFi slow sometimes, reboot helps, how do I debug it?

    - by January
    Ubuntu 12.04.1 with all updates installed. Laptop Lenovo Thinkpad X230 with Intel Corporation Centrino Advanced-N 6205. WiFi sometimes becomes extremely slow. Often this occurs when I wake the system from suspend and connect to a different network. I find no obvious clues in system logs. /etc/init.d/network-manager restart doesn't help, but a reboot does. How can I go on with debugging this issue? In specific, which parts of the system should I try to restart (without a complete reboot)? I know of problems with Intel WiFi (see for example this question and the instructions here), but if that was the problem, I would expect the WiFi to be slow at all times, and not just sometimes. Also, I have a gut feeling that it might be a DNS issue (for example, getting a page from a known server is faster than accessing a new server), but I don't know how to tackle it. Update: despite numerous updates in the meanwhile, I still observe this behavior. It happens always when I access my WiFi router at home after returning from work; when I reboot my laptop, the connection speed is good again.

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  • Windows Server 2008 R2 Upgrade via Remote Desktop

    - by Marko
    Is it possible to do an in-place upgrade of Windows Server 2008 R2 to Windows Server 2012 using only Remote Desktop? My plan is to extract WS 2012 installation iso file to C:\WS2012 and run the setup. After restart Remote Desktop connection will be lost, but will it be restored later? Is setup going to automatically install everything, restart, run WS 2012 and start listening for RDP connections? Server is rented and I would like to save the KVM fee. I read here that it's possible to upgrade WS 2008 to WS 2008 R2 like that. Thanks!

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  • Why can my Mac not connect to my iPhone via ssh?

    - by martin08
    I couldn't always ssh to my iPhone from my Mac. They're both on the same wifi network but sometimes the connection is established, sometimes it failed. From my Mac: $ ssh [email protected] ssh: connect to host 192.168.0.102 port 22: Operation timed out $ ping 192.168.0.102 PING 192.168.0.102 (192.168.0.102): 56 data bytes ping: sendto: No route to host ping: sendto: Host is down ping: sendto: Host is down I enabled SSH on the phone and am sure it can load webpages. So what might be a reason why they cannot connect? Thanks

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  • Chrome - Why am I automatically authenticated to a web app even after clearing browser cookies?

    - by Howiecamp
    I am accessing a web application using Chrome. If I sign out of the app and clear all Chrome history/cookies/etc (even Flash cookies which are now handled by Chrome in the same Clear History area) and then re-access the site, I am automatically logged in without being prompted for credentials. I then launched Chrome in Incognito mode and was able to reproduce the same behavior. However, the I was prompted upon the first logon while in Incognito mode. The web application behaves as expected in Internet Explorer 10. Some info about the application: It's a Sharepoint site using NTLM authentication The credentials are Active Directory-based, as the username is domain\username My connection is over the Internet and there is no AD relationship between my local Windows account, my Windows PC. In other words I (meaning my locally logged on user and my PC) are not in any way part of their AD domain. The site is running SSL on port 443 Why might Chrome be automatically authenticating me?

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