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  • thick client migration to web based application

    - by user1151597
    This query is related to application design the technology that I should consider during migration. The Scenario: I have a C#.net Winform application which communicates with a device. One of the main feature of this application is monitoring cyclic data(rate 200ms) sent from the device to the application. The request to start the cyclic data is sent only once in the beginning and then the application starts receiving data from the device until it sends a stop request. Now this same application needs to be deployed over the web in a intranet. The application is composed of a business logic layer and a communication layer which communicates with the device through UDP ports. I am trying to look at a solution which will allow me to have a single instance of the application on the server so that the device thinks that it is connected as usual and then from the business logic layer I can manage the clients. I want to reuse the code of the business layer and the communication layer as much as possible. Please let me know if webserives/WCF/ etc what i should consider to design the migration. Thanks in advance.

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  • determine if udp socket can be accessed via external client

    - by JohnMerlino
    I don't have access to company firewall server. but supposedly the port 1720 is open on my one ubuntu server. So I want to test it with netcat: sudo nc -ul 1720 The port is listening on the machine ITSELF: sudo netstat -tulpn | grep nc udp 0 0 0.0.0.0:1720 0.0.0.0:* 29477/nc The port is open and in use on the machine ITSELF: lsof -i -n -P | grep 1720 gateway 980 myuser 8u IPv4 187284576 0t0 UDP *:1720 Checked the firewall on current server: sudo ufw allow 1720/udp Skipping adding existing rule Skipping adding existing rule (v6) sudo ufw status verbose | grep 1720 1720/udp ALLOW IN Anywhere 1720/udp ALLOW IN Anywhere (v6) But I try echoing data to it from another computer (I replaced the x's with the real integers): echo "Some data to send" | nc xx.xxx.xx.xxx 1720 But it didn't write anything. So then I try with telnet from the other computer as well: telnet xx.xxx.xx.xxx 1720 Trying xx.xxx.xx.xxx... telnet: connect to address xx.xxx.xx.xxx: Operation timed out telnet: Unable to connect to remote host Although I don't think telnet works with udp sockets. I ran nmap from another computer within the same local network and this is what I got: sudo nmap -v -A -sU -p 1720 xx.xxx.xx.xx Starting Nmap 5.21 ( http://nmap.org ) at 2013-10-31 15:41 EDT NSE: Loaded 36 scripts for scanning. Initiating Ping Scan at 15:41 Scanning xx.xxx.xx.xx [4 ports] Completed Ping Scan at 15:41, 0.10s elapsed (1 total hosts) Initiating Parallel DNS resolution of 1 host. at 15:41 Completed Parallel DNS resolution of 1 host. at 15:41, 0.00s elapsed Initiating UDP Scan at 15:41 Scanning xtremek.com (xx.xxx.xx.xx) [1 port] Completed UDP Scan at 15:41, 0.07s elapsed (1 total ports) Initiating Service scan at 15:41 Initiating OS detection (try #1) against xtremek.com (xx.xxx.xx.xx) Retrying OS detection (try #2) against xtremek.com (xx.xxx.xx.xx) Initiating Traceroute at 15:41 Completed Traceroute at 15:41, 0.01s elapsed NSE: Script scanning xx.xxx.xx.xx. NSE: Script Scanning completed. Nmap scan report for xtremek.com (xx.xxx.xx.xx) Host is up (0.00013s latency). PORT STATE SERVICE VERSION 1720/udp closed unknown Too many fingerprints match this host to give specific OS details Network Distance: 1 hop TRACEROUTE (using port 1720/udp) HOP RTT ADDRESS 1 0.13 ms xtremek.com (xx.xxx.xx.xx) Read data files from: /usr/share/nmap OS and Service detection performed. Please report any incorrect results at http://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 2.04 seconds Raw packets sent: 27 (2128B) | Rcvd: 24 (2248B). The only thing I can think of is a firewall or vpn issue. Is there anything else I can check for before requesting that they look at the firewall server again?

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  • Update to Grub2.x broke Xubuntu 12.04 client in VirtualBox

    - by mikodo
    I have VirtualBox-4.1 installed in Ubuntu 10.04 with a .vdi running Xubuntu 12.04. Recently, a Grub update for Xubuntu 12.04 to Grub2.x, broke it with the following explanation: error: ELF header smaller than expected grub rescue _ Is there an easy fix for this? I could reinstall, but I tweaked Xubuntu 12.04 to my liking, and don't want to re-install a new .vdi. Unfortunately, I didn't make a snapshot of it. Google results, have been over my head. Thanks.

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  • Cannot access any remote resource after connecting to Cisco VPN on Vista

    - by Deepak Singh Rawat
    I have installed Cisco vpn client version 5.0.07.0290 on Vista Business SP2. I am able to successfully connnect to the vpn. But after connecting I am not able to access any resource in the vpn (like database, other computers in the network etc.). I have tried the following without any success : Older versions of the client Other vpn clients like Shrewsoft : same issue as the cisco vpn client Disabled Internet Connection Sharing service Installed the client in the root administrator account Run the installer as administrator Run the vpngui and ipsecdialer in XP compatibility mode and as administrator I am not sure how to troubleshoot this issue. Can somebody please help me in troubleshooting this issue? P.S : I've Zonealarm firewall, can that be an issue?

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  • Week in Geek: Dropbox Rolls Out 2-Step Authentication Feature in Experimental Desktop Client Build

    - by Asian Angel
    Our last edition of WIG for August is filled with news link goodness covering topics such as Firefox 17 will make add-ons more secure, password hints are easily extracted from Windows 7 and 8, the latest stable release of ChromeOS adds a new apps list feature, and more. How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU HTG Explains: Is UPnP a Security Risk?

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  • Remote access to Microsoft Dynamics NAV (C/Side) with native non-SQL database

    - by Joannes Vermorel
    I am facing a company that have a fairly recent Microsoft Dynamics NAV (C/Side) setup that comes with a non-SQL storage system called the native database server. I would need to be remotely connect to this database, and perform what would equate to SQL queries with very modest needs (no join, no complex filtering). I am rather ignorant of this technology, does someone knows to how make remote queries to this ERP?

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  • Microsoft Translator client library for Silverlight

    A while back immediately after MIX10 I started messing with Microsoft Translator APIs for Silverlight applications. I also got some people asking about Windows Phone 7 stuff and messed around with that a bit. Heres some post for reference: Make your Silverlight applications speak to you Using XNA libraries in Silverlight for Windows Phone 7 (with Translator as an example) In talking with the Translator team following MIX (where they announced they were working on a Silverlight class library...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • rdp allow client reconnect without password prompt after several hours

    - by Tom
    Let me describe the setup first: client PC with several rdp sessions to local servers, all opened from saved rdp sessions with stored passwords, using the standard windows rdp client. several windows servers on the LAN, with varying server OS: windows server 2003, 2008, and even 2012 now. When I log onto my PC I open up rdp sessions to all those servers, and keep them open all the time for various reasons. Overnight the client PC is put into sleep or hibernate mode, thereby braking the rdp connections. On the next day when I wake the client PC and login again, the rdp sessions automatically try to reconnect to the servers, and this leads to the question: starting with server 2008 something apparently changed in the rdp server config, as all servers with 2008, 2008r2 and 2012 will prompt for the password in the rdp session, whereas the 2003 server rdp connections will re-establish without the password prompt. Apparently there is a timeout setting on 2008+ that, when exceeded, requires a reauthentication. Is there any way to setup the 2008+ servers to behave like 2003 did? I'd like the rdp sessions to reconnect without a password prompt even after a several hour disconnect.

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  • screen sharing not painting properly on client

    - by wittless
    I cannot get the screen sharing utility in ubuntu 11.10 to work properly. When I connect, I get the initial screen, but no updates. When I connect to my ubuntu box via a laptop, I can see the mouse moving, but when I click on anything, the screen does not update. I can disconnect, reconnect and then see the updated screen, but it does not automatically refresh. Is anyone else having this problem? How do I fix it?

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  • OpenSSL force client to use specific protocol

    - by Ex Umbris
    When subversion attempts to connect to an https URL, the underlying protocol library (openssl) attempts to start the secure protocol negotiation at the most basic level, plain SSL. Unfortunately, I have to connect to a server that requires SSL3 or TLS1, and refuses to respond to SSL or SSL2. I’ve done some troubleshooting using s_client and confirmed that if I let s_client start with the default protocol the server never responds to the CLIENT HELLO: $ openssl s_client -connect server.domain.com:443 CONNECTED(00000003) write:errno=104 --- no peer certificate available --- No client certificate CA names sent --- SSL handshake has read 0 bytes and written 320 bytes --- New, (NONE), Cipher is (NONE) Secure Renegotiation IS NOT supported Compression: NONE Expansion: NONE --- Watching this in Wireshark I see: Client Server -------syn----------> <------ack----------- ---CLIENT HELLO-----> <------ack----------- [60 second pause] <------rst----------- If I tell s_client to use ssl2 the server immediately closes the connection. Only ssl3 and tls1 work. Is there any way to configure openssl to skip SSL and SSL2, and start the negotiation with TLS or SSL3? I've found the OpenSSL config file, but that seems to control only certificate generation.

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  • Oneiric updates cause "Window Creation Error" in Second Life client

    - by Yuttadhammo
    With the latest Oneiric updates, I've been unable to use Second Life, a virtual reality simulator, in Ubuntu. I assume it has something to do with the NVidia driver, since the error in the console says: WARNING: createWindow: LLWindowManager::create() : Error creating window. WARNING: LLViewerWindow: Failed to create window, to be shutting Down, be sure your graphics driver is updated I guess I could file a bug on Launchpad, but I'm not sure where to file it. Does anyone have any insight into what may be causing this problem? It was working fine a week ago, and older viewers (Imprudence viewer anyway) still work fine.

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  • Approach to Authenticate Clients to TCP Server

    - by dab
    I'm writing a Server/Client application where clients will connect to the server. What I want to do, is make sure that the client connecting to the server is actually using my protocol and I can "trust" the data being sent from the client to the server. What I thought about doing is creating a sort of hash on the client's machine that follows a particular algorithm. What I did in a previous version was took their IP address, the client version, and a few other attributes of the client and sent it as a calculated hash to the server, who then took their IP, and the version of the protocol the client claimed to be using, and calculated that number to see if they matched. This works ok until you get clients that connect from within a router environment where their internal IP is different from their external IP. My fix for this was to pass the client's internal IP used to calculate this hash with the authentication protocol. My fear is this approach is not secure enough. Since I'm passing the data used to create the "auth hash". Here's an example of what I'm talking about: Client IP: 192.168.1.10, Version: 2.4.5.2 hash = 2*4*5*1 * (1+9+2) * (1+6+8) * (1) * (1+0) Client Connects to Server client sends: auth hash ip version Server calculates that info, and accepts or denies the hash. Before I go and come up with another algorithm to prove a client can provide data a server (or use this existing algorithm), I was wondering if there are any existing, proven, and secure systems out there for generating a hash that both sides can generate with general knowledge. The server won't know about the client until the very first connection is established. The protocol's intent is to manage a network of clients who will be contributing data to the server periodically. New clients will be added simply by connecting the client to the server and "registering" with the server. So a client connects to the server for the first time, and registers their info (mac address or some other kind of unique computer identifier), then when they connect again, the server will recognize that client as a previous person and associate them with their data in the database.

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  • Managing client passwords [closed]

    - by C.Johns
    I am just starting up a small website development business and one of the issues I am having is remembering passwords and account information for clients hosting, cpanel, ftp accounts etc. I was wondering what is the most suitable system / industry standard for controlling such information? Pretty marginal on the close there... I read the FAQ and I felt list this could be a common issue for webmasters, its defiantly not a coding questions so stackoverflow is out of the question and its not a broad question its focused on one particular aspect of being a webmaster.

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  • Silverlight 4 + RIA Services: Ready for Business: Updating Data in the Client

    To continue our series, lets look at updating the data.  I have created a Plates.xaml page with very similar structure to the above.    For details on how I created this page, check out my PDC 09 demo walk through.    Now lets look at updating the Plate data.. First we will create some default form UI by dragging an entity from the datasources window in much the same way we did above.  But before we create the UI, notice the order of the fields it...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Proxy Client for Ubuntu

    - by WindowsEscapist
    I want to use a proxy for web browsing similar to Ultrasurf for Windows. I've tried to use TOR, but it isn't working! The problem is whenever I search something along the lines of "ubuntu + linux proxy", sites assume that I want to set up a proxy server rather than use one. I just want something with little to no configuration needed (i.e. I don't have my own proxy server). UltraSurf is a free software which enables users inside countries with heavy Internet censorship to visit any public web sites in the world safely and freely. Users in countries without internet censorship also use it to protect their internet privacy and security.

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  • Can a NAT close out VPN connections?

    - by Scoop
    I have a client running on a VPN behind a NAT. The client becomes inaccessible after a while if it is not "active". The VPN software is PPTP and the OS of the client if Debian. I'm unsure about the exact cause of what makes it inaccessible or if it is another piece of software that is causing the problem. But my current thing I am trying to figure out is if the NAT is healing and causing the client VPN to become inaccessible. Could this be causing the problem or should I look elsewhere?

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  • Ubuntu One Client 3.02b stuck at "File Sync Starting" on Windows XP 32-bit

    - by user1491665
    I have been using Ubuntu One on Natty on my laptop and (sad) Win-XP 32-bit on my desktop. At first, the sync function worked well on both platforms but now it's stuck at "File sync starting" on Win-XP 32-bit. I have already tried to uninstall it completely (removed device, deleted folder, restarted pc) and reinstall it but no luck. It is able to display a list of "My Personal Folders" though. I did some Google-ing and found someone had similar problem on Win7 64-bit and some said the bug is resolved since version 3. Unfortunately that's not the case for me. As the title suggests, I am running v3.02b on WinXP. Any help / comments would be greatly appreciated. Thanks!

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