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  • 5 ways to stop code thrashing&hellip;

    - by MarkPearl
    A few days ago I was programming on a personal project and hit a roadblock. I was applying the MVVM pattern and for some reason my view model was not updating the view when the state changed??? I had applied this pattern many times before and had never had this problem. It just didn’t make sense. So what did I do… I did what anyone would have done in my situation and looked to pass the blame to someone or something else. I tried to blame one of the inherited base classes, but it looked fine, then to Visual Studio, but it seemed to be fine and eventually to any random segment of code I came across. My elementary problem had now mushroomed into one that had lost any logical basis and I was in thrashing mode! So what to do when you begin to thrash? 1) Do a general code cleanup – Now there is a difference between cleaning code and changing code . When you thrash you change code and you want to avoid this. What you really want to do is things like rename variables to have better meaning and go over your comments. 2) Do a proof of concept – if cleaning code doesn’t help. The  you want to isolate the problem and identify the key concepts. When you isolate code you ideally want it to be in a totally separate project with as little complexity as possible. Make the building blocks and try and replicate the functionality that you are getting in your current application. 3) Phone a friend – I have found speaking to someone else about the problem generally helps me solve any thrashing issues I am having. Usually they don’t even have to say anything to solve the problem, just you talking them through the problem helps you get clarity of mind. 4) Let the dust settle – Sometimes time is the best solution. I have had a few problems that no matter who I discussed them with and no matter how much code cleaning I had done I just couldn’t seem to fix it. My brain just seemed to be going in circles. A good nights rest has always helped and often just the break away from the problem has helped me find a solution. 5) Stack overflow it – So similar to phone a friend. I am really surprised to see what a melting pot stack overflow has been and what a help it has been in solving technology specific problems. Just be considerate to those using the site and explain clearly exactly what problem you are having and the technologies you are using or else you will probably not get any useful help…

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  • tradeoffs of iSCSI vs. AFP when using Time Machine with a NAS?

    - by ajit.george
    I'm setting up a home NAS device (Synology DS409) that I'm planning to use for Time Machine backups (amongst other things). What are the tradeoffs between using iSCSI or AFP to mount the backup volume? The Synology wiki suggests that iSCSI is better if the Mac will be frequently disconnected from the network or sleeping, from the point of view of the volume automatically remounting. What about filesystem consistency? Given that unplugging a USB drive without properly unmounting it often requires the Time Machine volume to be repaired, would iSCSI have the same issues? Thanks in advance.

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  • How to SSH an outside server from a computer which is behind a proxy firewall ?

    - by Karan
    I access the Internet through an HTTP proxy firewall at college. And I need to login to a computer, via SSH, which is outside our network. I tried it as Linux command and on Windows using PuTTY. I also configured PuTTY to use our server's address. But still, "Proxy error: 403 forbidden" pops up. They must've blocked SSH access to outside systems. (college systems as accessible). I can SSH a web server (not the proxy server) at the college, which I use to browse proxy-free by tunneling. Now this server allows to browse restricted sites, but still no SSH. Any workaround, please?

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  • Bound external Cisco CIGESM ports to a specific BladeServer

    - by Vinícius Ferrão
    We have an IBM BladeCenter with 14 blade servers and one external Cisco CIGESM for Ethernet connectivity. Since this hardware is a little old, we will use it for other services, and we want to run a pfSense instance on one of the blades. It's just an Firewall Appliance, but it needs two network interfaces: one for the WAN and the other one for LAN access. Our architecture works on top of static routes, we don't use NAT, so we got the WAN IP in one interface routing to the another one. The main problem is how to plug the WAN cable in one of the four external ports and make it exclusive to the blade server containing the firewall. And we also need an exit port that goes through a 3COM 4200G switch that makes the internal routing and VLAN separation. Thanks in advance

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  • Are there any command line utilities which can calculate and/or limit how fast a pipe is running?

    - by stsquad
    I'm doing some basic stress testing of a Linux kernel network IWF with netcat. The set-up is fairly simple. On the target side: nc -l -p 10000 > /dev/null And on my desktop I was running: cat /dev/urandom | nc 192.168.0.20 10000 I'm using urandom for some poor-mans fuzz testing. However I find that even at this rate I can break something quite quickly. EDIT So I've been playing with trickle to rate limit how fast I'm generating data: cat /dev/urandom | trickle -u 10 nc 192.168.0.20 10000 But it's hard to tell if this is working. What would be really useful is a the pv equivilent of trickle that can work with pipes.

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  • why this routing configuration does not work?

    - by avs099
    I have 2 VMs in HyperV role: first is RRAS - it has 2 interfaces (both manually configured, no DHCP): 192.168.1.110 - "external" one, connected to the router 192.168.10.2 - that's internal interface which other VMs will be using as well also I added VPN connection to our main server - and it gets 192.168.2.136 IP address in 192.168.2.XXX network. And IP route is create on the server as well for this interface. second VM is called KITCHENER. It only has 1 interface 192.168.10.99 / 255.255.255.0, with default gateway set to RRAS server - 192.168.10.2 QUESTION: how can I ping "main server" - 192.168.2.1 - from the KITCHENER server when RRAS server is connected to VPN? please see screenshots with ipconfig /all, route print and ping 192.168.2.1 commands. What needs to be done to get this working? all servers are Windows 2008 R2 if that matters.

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  • What's an easy way to shut down a computer that I'm connected to via RDP

    - by MBraedley
    I have a secondary machine on my local network that I usually use via RDP. Most of the time, it's on 24/7, but there are times when I may want to shut it down from the RDP client machine. The shutdown and restart options aren't available from the Windows XP start menu when you connect to a machine via RDP, so how can I shut this machine off without actually going to the physical machine? Also note that this computer currently doesn't have a monitor attached to it, which is partly why I want to be able to shut it down over RDP.

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  • Windows diagnostic tools

    - by Tathagata
    I just joined a small computer lab which basically uses all Windows boxes and a few Windows Sever 2003. Coming from a *nix background I am missing all the nice tools that we have for diagnosis and troubleshooting. My question is what are the safe, free (not terribly concerned if it is like beer or freedom -both acceptable) tools out there that Windows system admins use for their day to day troubleshooting (network, applications, servers etc). I am aware of the tools that come with Windows (and their limited capabilites) - so my query is with what do you fill in your arsenal? (may be a list of win versions of tools that come in standard linux distros)

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  • Designing a completly new database/gui solution for my compnay

    - by user1277304
    I'm no expert when it come to Everything Visual Studio 2010 and utilizing SQL server 2008. I'm sure some of my personal projects I've built for personal use would get laughed off the face of the planet, but SQLCe has been the solution I was looking for those home type of projects. And they work, flawlessly. Now I feel it's time to step up to the big league. I want to develop a complete, unified and module based solution for my compnay that I'm working for. We're still using stuff from the 80s for goodness sake! I use Excel and query the ancient database on my own because I can't stand the GUI. Nothing against people of age, but the IDE our programmers are using is from the stone age, and they use APL of all things with it. I've yet to see a radio buttton control anywhere in the GUI where it would make sense. Anyway, I want to do this right from the ground up. I'm by no means a newbie when it comes to programming in .NET 2010, however, I want the entire solution to be professionaly done. I want version control, test projects, project flow, SQL 2008 integration and all the bells and whistles that come with that. I know for a fact that if we had something like that runnning, not only would development costs and time be slashed four fold, but the possibilities for expansion and performance would sky rocket. (Between the GUI an our DB engine, it can only use ONE CORE! ONE! It's 2012 for goodness sake!) Our buisness is growing and our current ancient solution just can't keep up, and I'd hate to see our buisness go down in flames because our programmer is stuck in the 80's and refuses to use anything current. So I ask you guys, the experts and know-it-alls, where do I start? Are there any gems of good books out there in the haystack of all "This for dummies" type of deals? I already have several people backing me in this endevour, and while it may seem brash to just usurp the current programmers, I'm doing this for the company as a whole. Thank you guys for your time.

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  • Particle trajectory smoothing: where to do the simulation?

    - by nkint
    I have a particle system in which I have particles that are moving to a target and the new targets are received via network. The list of new target are some noisy coordinates of a moving target stored in the server that I want to smooth in the client. For doing the smoothing and the particle I wrote a simple particle engine with standard euler integration model. So, my pseudo code is something like that: # pseudo code class Particle: def update(): # do euler motion model integration: # if the distance to the target is more than a limit # add a new force to the accelleration # seeking the target, # and add the accelleration to velocity # and velocity to the position positionHistory.push_back(position); if history.length > historySize : history.pop_front() class ParticleEngine: particleById = dict() # an associative array # where the keys are the id # and particle istances are sotred as values # this method is called each time a new tcp packet is received and parsed def setNetTarget(int id, Vec2D new_target): particleById[id].setNewTarget(new_target) # this method is called each new frame def draw(): for p in particleById.values: p.update() beginVertex(LINE_STRIP) for v in p.positionHistory: vertex(v.x, v.y) endVertex() The new target that are arriving are noisy but setting some accelleration/velocity parameters let the particle to have a smoothed trajectories. But if a particle trajectory is a circle after a while the particle position converge to the center (a normal behaviour of euler integration model). So I decided to change the simulation and use some other interpolation (spline?) or smooth method (kalman filter?) between the targets. Something like: switch( INTERPOLATION_MODEL ): case EULER_MOTION: ... case HERMITE_INTERPOLATION: ... case SPLINE_INTERPOLATION: ... case KALMAN_FILTER_SMOOTHING: ... Now my question: where to write the motion simulation / trajectory interpolation? In the Particle? So I will have some Particle subclass like ParticleEuler, ParticleSpline, ParticleKalman, etc..? Or in the particle engine?

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  • Expanding Influence and Community

    - by Johnm
    When I was just nine years of age my father introduced me to the computer. It was a Radio Shack TRS-80 Color Computer (aka: CoCo). He shared with me the nuances of writing BASIC and it wasn't long before I was in the back seat of the school bus scribbling, on a pad of paper, the code I would later type. My father demonstrated that while my friends were playing their Atari 2600 consoles, I had the unique opportunity to create my own games on the Coco. One of which provided a great friend of mine hours and hours of hilarity and entertainment. It wasn't long before my father was inviting me to tag along as he drove to the local high school where a gathering of fellow Coco enthusiasts assembled. In these meetings all in attendance would chat about their latest challenges and solutions. They would swap the labors of their sleepless nights eagerly gazing into their green and black screens. Friendships were built and business partners were developed. While these experiences at the time in my pre-teen mind were chalked up to simply sharing time with my father, it had a tremendous impact on me later in life. This past weekend I attended the Louisville SQL Saturday (#45). It was great to see that there were some who brought along their children. It is encouraging to see fresh faces in the crowd at our  monthly IndyPASS meetings. Each time I see the youthful eyes peering from the audience while the finer details of SQL Server is presented, I cannot help but to be transported back to the experiences that I enjoyed in those Coco days. It is exciting to think of how these experiences are impacting their lives and stimulating their minds. Some of these children have actually approached me asking questions about what was presented or simply bragging about their latest discovery in programming. One of the topics that arose in the "Women in Technology" session in Louisville, which was masterfully facilitated by Kathi Kellenberger, was exploring how we could ignite the spark of interest in databases among the youth. It was awesome to hear that there were some that volunteer their time to share their experiences with students. It made me wonder what user groups could achieve if we were to consider expanding our influence and community beyond our immediate peers to include those who are simply enjoying their time with their father or mother.

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  • Port Forwarding on Actiontec GT704-WG Router Issues

    - by adamweeks
    I am trying to setup a server at customer's location that has the Actiontec GT704-WG DSL router. The port forwarding it not working at all. Here's the details: Server: OpenSuse Linux box with a static IP address of 192.168.1.200 Application running accepting connections on port 8060 Firewall disabled Local connections (within the network) working properly Router: Updated to latest firmware available DHCP range set to 192.168.1.69-192.168.1.199 to not have any conflicts with the server Firewall set to "off" Rule set in the "Applications" setting to forward 8060 TCP and UDP to 192.168.1.200 machine (I've tried using the "TCP,UDP" option as well as both individual options) I've also tried just simply putting the server in the DMZ to see if I could connect to anything, but still nothing. Looking for any clues before I call and waste hours explaining the issue to tech support.

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  • How should I troubleshoot a problematic wireless connection on Linux?

    - by Gearoid Murphy
    I recently purchased a netgear 150 usb wireless dongle for use with my 11.10 Xubuntu amd64 system. Using the network-manager interface, I can see local wireless networks and enter the authentication details for my local wireless lan. Unfortunately, the connection does not seem to work, I keep getting notifications that my wireless has disconnected (but none indicating that I've connected). When I examine syslog, it seems to indicate that I've successfully associated with the wireless switch and that dhcp has successfully acquired an ip address but the log shows that the dhcp process keeps sending requests, eventually dropping the connection. 'ifconfig wlan0' never shows the dhcp address logged in syslog. I suspect that the problem lies with the usb dongle, my configuration or the wireless switch but I am not certain how to isolate the problem, can anyone provide some insight on how I should go about homing in on the cause of this problem or verifying the functionality of the individual components, thanks.

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  • Airport Express configuration

    - by Christina
    We are trying to set up remote access to a computer that houses a server fro a particular program we are running. The program says we need to configure the office router. In the firewall settings it says to open ports 5345-5351 (TCP only). Port Forwarding: You will also need to forward the same range of ports (5345-5351) to the computer running the Server. This typically requires that the computer running the Server be assigned a static IP on the local network. Having trouble figuring out which IP address we actually need to be using on the client side of this program in order to access the server computer. Can someone walk through this process?? We are working on Mac OSX 10.5. Thank you in advance!

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  • Managing self-updating Windows software in GPO-deployed packages

    - by Paul
    Being very new to Windows software distribution for a small network (<50 clients) I was wondering how software packages like Adobe's Reader or Java are handled. I can deploy them as MSIs via group policies just fine. But what happens when the client software detects updates? What are common ways to handle this? Disable the software's autoupdate feature? Redeploy when the admin detects a new version? Just fishing for knowledge, thanks for any hint.

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  • Are all SFP+ tranceivers usable for FEX between Nexus 5000 and Nexus 2000?

    - by Alain O'Dea
    I am looking at building a network with Nexus 5000 parent switches and Nexus 2000 fabric extenders. The mystery at the moment is what kind of SFP+ tranceivers are required for cross-connecting racks. Right now I am considering FET-10G, but I am not sure that 100m is long enough given the separation between racks is potentially very large since it is a rented rack environment. Are all SFP+ tranceivers usable for FEX between Nexus 5000 and Nexus 2000? Specifically, can SFP-10G-SR transceivers be used for longer distance FEX?

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  • How can Facebook's session get mixed up because of NAT and/or Proxy

    - by Alex
    Have received some reports from a customer (a very large company) they reported issues from clients who are using Facebook. These clients claim that once in a while when they log in to Facebook they end up in someone else's session. I know that network is NATed then Proxied before getting to Facebook.com. Although I'm not able to explain how this issue can occur. Is it possible that the Proxy is not sending the right session back to the clients? How can they end up with someone else's session since Facebook is cookie based session?? Anyone seen this before?

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  • Problem accessing MICROSOFT##SSEE database (Error: 18456, Severity: 14, State: 16.)

    - by Philipp Schmid
    After an unexpected server shutdown due to a power failure, I can no longer connect to the internal windows database MICROSOFT##SSEE which is hosting Central Admin for my SBS 2008 server. The log shows: Error: 18456, Severity: 14, State: 16. Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. [CLIENT: <named pipe>] I've tried to connect using the SQL Management studio (connecting to .pipemssql$microsoft##sseesqlquery) but no luck. The SQL Server Configuration Manager doesn't show a entry for 'Protocols for MICROSOFT##SSEE' (but shows it for 2 other database hosted on the same SQL server 2005 Express edition. I have tried to restore the master.ldf and mastlog.log files from a backup, but the issue persists.

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  • creating decision tree based troubleshooting documentation?

    - by Joseph
    We troubleshoot a lot of server and network issues and follow a loose set of steps on what to do in different cases. With more and more people and responsibility, the need for standardization is needed so we don't miss something. I know I could accomplish what I want using flowcharts, but I'd like to do something similar to a "Choose Your Own Adventure" style. I think this is pretty much the same as what support call centers seem to do. Are there any tools to make creating such documentation easier? I'm looking for a web based approach if possible.

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  • What is the default value for Empty Temporary Internet Files when browser is closed in IE8?

    - by schellack
    We have four different machines that all have "Empty Temporary Internet Files when browser is closed" set to true (checked) in IE8's Internet Options (located under the Security section in the Advanced tab). No one remembers checking that checkbox to turn on the setting. What is the default value supposed to be? I'm specifically interested in Windows 7 and Windows XP. I have run rsop.msc on one of the corporate machines—3 of the 4 are members of a corporate network/domain—and see this under User Configuration, which makes the current scenario seem even stranger: The Local Group Policy Editor (gpedit.msc) also shows the Configure Delete Browsing History on exit setting to be Not configured (under Computer ConfigurationAdministrative TemplatesWindows ComponentsInternet ExplorerDelete Browsing History).

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  • System freezes for 5 seconds when seeking in or skipping to songs and videos

    - by pragmatick
    When I start playing a new video or MP3 or skip to a time when playing them, my system hangs for a couple of seconds. A restart solves this problem, but only for a while. It does not matter which player I use (VLC, Media Player, Winamp, Zoom Player), which media files or if they are located on a network drive or on the local hard drive. Everything else works flawlessly and after the playing has started, there are not problems - until I switch to another file. Additionally, when the Winamp playlist continues to the next song, the system does not hang. When I skip to the next song manually, the system hangs. I've been using Windows XP for years and consider myself a fairly professional windows user, but I have no idea what could cause this. Dual-core 2Ghz, 2GB RAM, Windows XP SP3, Audigy card with kxproject. Worked flawlessly for years. Would be glad if anyone could help.

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  • What is the advantage of iSCSI over SMB?

    - by sofakng
    At my house I'm running a Hyper-V server with a Windows Server 2008 R2 VM acting as a file server. Files are shared across my network using SMB. (Also, the machine is using a PERC 6/i RAID card but I don't think that's important) I'm thinking about setting up a dedicated SAN (iSCSI) machine and then switching my Hyper-V server to ESXi. What are the advantages of using iSCSI versus SMB? I think I would still need a file server OS (eg. Win 2k8) sharing files via SMB so I'm not sure the end result would be any different than my current setup...

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  • Restarted computer, now wireless and Visual Studio is broken

    - by Earlz
    I installed the new update for TortoiseSVN which requires a restart. Upon restarting a lot of things broke. I'm currently running a virus scan, but what would cause this? Among the things that no longer work is Visual Studio. It now says "Invalid License Data. A reinstall is required" and my wireless internet does not work. When I go to connect to my network it will say "Can not connect" and then when I diagnose the problem it says "The connection to accesspoint-name was cancelled" (and yes, canceled is misspelt like that) What could have caused this? My computer did not install any updates or anything like that upon restarting and it was running fine before I restarted it.

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  • accessing files on a shared folder via IIS

    - by Darkcat Studios
    Im not sure if this suits stackexchange, serverfault or here... so i'll go with here for a start. I'm having issues setting up a network share to be accessed by IIS, all I need to do is read/write files on the Other server. We have 2 servers set up (Both 2008 R2 & IIS 7.5), one is the WEB server, which is externally accessible and NOT part of the domain. We also have an Intranet server which has no internet connectivity and is part of the domain. These 2 servers can talk to each other happily, I have the SQL server on the WEB server shared across to the intranet server so that the web content is editable from the intranet. I can share a folder on the web server (say, wwwroot/Images/) and connect to it from the intranet server, even have it as a mapped drive (but i know thats not going to work for IIS to access it), So there seems not to be a connectivity issue. I can also set up a Virtual folder in IIS on the Intranet server - this is where it gets annoying - I cant connect using pass-through authentication because there is no suitable user on the web server (which is not on the domain). If i set up a user on the web server, eg Intranet_USR, and give it appropriate rights to the folder, files and share, i can connect, but only view folder contents in IIS, not read, although that user has read privileges!! Any help much appreciated!

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  • Prevent machine in a LAN from receiving a remote shutdown

    - by WebDevHobo
    I'm probably just overreacting, but I recently came across a LAN-scanner that showed me the option "remote shutdown", for all found computers on the scanned network. Now, how exactly does this work? If I send such a message, will the shutdown happen no matter what, or is it required to have the password/user-name of the user of that other computer. Mostly I'm wondering: can this be done to me and how do I prevent it? EDIT: what's more, I had the scanner check for shares. The result being this: Double clicking the links opens them in explorer, basically meaning my entire C and F drive(only 2 HD's I have) are completely exposed to anyone in my LAN. Or can I open these because it's my own machine?

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