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• Why won't IE let users login to a website unless in In Private mode?

  - by Richard Fawcett

  I'm not entirely sure this belongs on SuperUser.com. I also considered ServerFault.com and StackOverflow.com, but on balance, I think it should belong here? We host a website which has the same code responding to multiple domain names. On 28th December (without any changes deployed to the website) a percentage of users suddenly could not login, and the blank login page was just rendered again even when the correct credentials were entered. The issue is still ongoing. After remote controlling an affected user's PC, we've found the following: The issue affects Internet Explorer 9. The user can login from the same machine on Chrome. The user can login from an In Private browser session using IE9. The user can login if the website is added to the Trusted Sites security zone. The user can NOT login from an IE session in safe mode (started with iexplore -extoff). Only one hostname that the website responds to prevents login, the same user account on the other hostname works fine (note that this is identical code and database running server side), even though that site is not in trusted sites zone. Series of HTTP requests in the failure case: GET request to protected page, returns a 302 FOUND response to login page. GET request to login page. POST to login page, containing credentials, returns redirect to protected page. GET request to protected page... for some reason auth fails and browser is redirected to login page, as in step 1. Other information: Operating system is Windows 7 Ultimate Edition. AV system is AVG Internet Security 2012. I can think of lots of things that could be going wrong, but in every case, one of the findings above is incompatible with the theory. Any ideas what is causing login to fail? Update 06-Jan-2012 Enhanced logging has shown that the .ASPXAUTH cookie is being set in step 3. Its expiry date is 28 days in the future, its path is /, the domain is mysite.com, and its value is an encrypted forms ticket, as expected. However, the cookie is not being received by the web server during step 4. Other cookies are being presented to the server during step 4, it's just this one that is missing. I've seen that cookies are usually set with a domain starting with a period, but mine isn't. Should it be .mysite.com instead of mysite.com? However, if this was wrong, it would presumably affect all users?

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• Registering domain during christmas holydays

  - by arkascha

  One of the domain names I tried to register previously has been blocked by a domain grabber two days prior to my own attempt. That was about 1 year ago. The attempt to buy the domain from that person failed due to a totally exaggerated price. So I dropped the issue and watched the domain (offered at sedo.com). As expected there were no more offers, the domain was not sold. Now I learn from the whois database that the registration of that domain name ends on 25.12.2012 (christmas holyday). This raises two questions for me, I fail to find reliable answers on the internet. So maybe someone experienced here can drop a statement or a hint: is it reasonable that the domain name in question really will be free again when that date mentioned in the whois database up to when the domain is registered has passed? I certainly know that the registration can be prolonged, that is not what I mean. I expect (hope) that that domain grabber does not extend the registration, since it costs money and effort and he failed to sell the domain. Provided this is the case and the domain registration is not prolonged, is that date mentioned reliable? Or might it just be some 'default' date? I would like to try to register that domain name as soon as it is unregistered. Since that domain grabber registered that domain only two days before my own registration attempt I would like to prevent such annoying interference next time. So I ask myself: is it possible to register a domain name on a holyday? I mean not to send an email to my provider to do so on that day or before, but to actually have to process taking place as not to wait for 1-2 days after the unregistration? My own provider which I am very happy with does not offer such service on a holyday (which is perfectly understandable). They are 'still checking' if they can offer something automatic. I researched and did not find an answer to the question if that is possible at all. Is an autoomatic registration attempt on a holyday possible? Where can I do that? Is that reliable? Thanks for any reply!

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• MvcReportViewer v.0.4.0 is available!

  - by Ilya Verbitskiy

  Originally posted on: http://geekswithblogs.net/ilich/archive/2014/06/04/mvcreportviewer-v.0.4.0-is-available.aspxToday I released new version of MvcReportViewer. This release contains mostly bug fixes reported by library users. I am glad to see that Open Source model works and people try to contribute to the project! Thank you everybody for your bug repots and help with the project. Version 0.4.0 Added support for ASP.NET MVC 5 Removed jQuery dependency. I have not tested it on IE8 or earlier versions. Any help with testing is welcome! Fixed problem with SSRS keep-alive cookies. Keep-alive cookies are issued every time a report is opened during a browser session. Many people don't restart their browsers and in my case, Chrome doesn't get rid of the cookie session data on close - had to manually delete them for the reports to start working again. I added KeepSessionAlive control settings to manage SSRS keep-alive behavior. It is set to false by default to fix Bad Request 400: Request Too Long issue. You can find usage example in Fluent.cshtml. Fixed the bug when ReportViewer Control parameters was not parsed when ShowParameterPrompts parameter had not been set. Changed public static MvcReportViewerIframe MvcReportViewer method to use IEnumerable<KeyValuePair<string, object>> reportParameters instead of simple object. The reason is users reported that they mostly use multiple report parameters’ values. Added support for SSRS hosted on Windows Azure. Users should set MvcReportViewer.IsAzureSSRS property to true in Web.config to use Windows Azure authentication. I do not have Windows Azure SSRS and build the code using http://msdn.microsoft.com/en-us/library/gg552871.aspx#Authentication article. It would be nice if somebody from community tested the change or provided me a test report on Windows Azure for testing purposes.

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• Passenger, Apache and avoiding page caching

  - by user38382

  I'm hosting a rack application with passenger and apache. The application is setup to cache the content of each request to the public directory after each request. This allows apache to serve the content directly as a static page for future requests. I would like to tell Apache, presumably through some rewrite rules that any requests with query parameters should not be cached, but instead passed down to the rack application. With a mongrel setup I would just redirect it to the balancer if it meets my rewrite conditions. How do you do the same with passenger?

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• How to create an GUI that communicate with the USB Devices

  - by VINAYAK

  I am doing my Project using win 32 programming.I am just learning about win32 programming and able to create an UI.I want to communicate with an USB Device with that UI.SO,How can i go for that?Is there any predefined functions will be there are we need to create the function for communicating with the OS and get the devices List and got the details about them. My purpose is to , 1.Creating an UI that tells about the Basic information about the device(We want to send a control request to the device to get the descriptors). 2.For that first of all i want to communicate with the OS for device attachment.That will lead to get the information about the device and Enumeration takes place and then only i request the device information through descriptors by using standard Requests. 3.And also i want to create the driver for my device.That will also need to achieve for communicating with OS(Windows). So,can anyone help me about this?How can i achieve this or approach this? Note: I am at the entry level now so anyone give response will be in a detailed format like step by step process would be appreciable.

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• Apache2 + FCGI + PHP5 not creating sockets / pools

  - by CodyRo

  I have a pretty vanilla setup with Apache2, FastCGI setup as DSO and serving PHP through an external CGI script that sets the max children / serves the request to PHP. The issue is FastCGI doesn't appear to be creating the PHP sockets / pooling them so each request calls the php-cgi binary, then dies off .. effectively making the reason I want to use FastCGI moot. The only configuration directives I have are: AddHandler php5-fastcgi .php Action php5-fastcgi /cgi-bin/fcgi.cgi FastCgiIpcDir /usr/local/apache2/fastcgi The dyanmic/ directory is getting created as anticipated, but there are no sockets in there. Permissions are indeed correct. Any help would be greatly appreciated, thanks!

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• Can't get spellcheck to work in any program?

  - by Brian John

  I have noticed that spellcheck will work with any program on Ubuntu. For some reason, this stopped working when I purged OpenOffice and replaced it with LibreOffice. I am guessing that I failed to install back a package that provides this spellcheck. All of thee misstakes inn thiss sentencee were NoT caughht. Spell check is vital to me because I am a student and I can not hand in work with mispellings.

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• unknown monitor problem

  - by dev

  I'm using HCL P30 laptop with 1280x800 60 Hz default resolution.But none of the ubuntu versions are capable of detecting my monitor.In 11.04 the resolution is 1024x768 61 Hz. When I run xrandr command in terminal,it returns xrandr: Failed to get size of gamma for output default Screen 0: minimum 640 x 480, current 1024 x 768, maximum 1024 x 768 default connected 1024x768+0+0 0mm x 0mm 1024x768 61.0* 800x600 61.0 640x480 60.0 So,how can I set it to 1280x800 60 Hz. plz reply soon. thnx in advance.

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• Problem getting GOBI 2000 HS to work

  - by Zypher

  I've been trying to get my integrated GOBI WWAN card to work under 10.10 for a while now. I was able to get the network manager to see the card after installing the gobi-loader package. I was able to setup the connection, but i cannot establish a connection to Verizon. Below is the output from /var/log/daemon.log as i try to connect. Oct 19 14:29:42 gbeech-x201 AptDaemon: INFO: Quiting due to inactivity Oct 19 14:29:42 gbeech-x201 AptDaemon: INFO: Shutdown was requested Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> Activation (ttyUSB0) starting connection 'Verizon connection' Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> (ttyUSB0): device state change: 3 -> 4 (reason 0) Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled... Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started... Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> (ttyUSB0): device state change: 4 -> 6 (reason 0) Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete. Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) scheduled... Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) started... Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> (ttyUSB0): device state change: 6 -> 4 (reason 0) Oct 19 14:33:45 gbeech-x201 NetworkManager[1105]: <info> Activation (ttyUSB0) Stage 1 of 5 (Device Prepare) complete. Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <warn> CDMA connection failed: (32) No service Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <info> (ttyUSB0): device state change: 4 -> 9 (reason 0) Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <info> Marking connection 'Verizon connection' invalid. Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <warn> Activation (ttyUSB0) failed. Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <info> (ttyUSB0): device state change: 9 -> 3 (reason 0) Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <info> (ttyUSB0): deactivating device (reason: 0). Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <info> Policy set 'Auto SO-GUEST' (wlan0) as default for IPv4 routing and DNS. Oct 19 14:34:46 gbeech-x201 NetworkManager[1105]: <info> Policy set 'Auto SO-GUEST' (wlan0) as default for IPv4 routing and DNS.

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• nginx timeout albeit ridicolous configuration

  - by Joa Ebert

  The scenario is an API server that should handle uploads. Posting on my.host.com/api/upload should do something with the body the client sends. However the API server has been designed to block the whole request until it fully processed the file, including some analysis which can take up to approx. 5min (...!). This has to change of course. In the meantime I wanted to setup nginx as a load balancer in front of the API servers. I quickly ran into a timeout issue, consulted Google and came up with this ridiculous test configuration: user www-data; worker_processes 4; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; access_log off; sendfile on; send_timeout 3600; keepalive_timeout 3600 120; tcp_nopush on; tcp_nodelay on; gzip off; client_header_timeout 3600; client_body_timeout 3600; proxy_send_timeout 3600; proxy_read_timeout 3600; proxy_connect_timeout 1800; proxy_next_upstream error; include /etc/nginx/conf.d/*.conf; include /etc/nginx/sites-enabled/*; } And upstream test { server host1; server host2; } server { listen 80; server_name my.host.com; client_max_body_size 10m; location /api/ { proxy_pass http://test; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $host; proxy_redirect off; } } Still, when an upload happens, I get the following result in the error.log: 2010/12/22 13:36:42 [error] 5256#0: *187359 upstream timed out (110: Connection timed out) while reading response header from upstream, client: xx.xx.xx.xx, server: my.host.com, request: "POST /api/upload HTTP/1.1", upstream: "http://apiserver:80/upload", host: "my.host.com" What else could I do? If I look at the log of the API server I still see that it is processing the request and analyzing the file. But I think 3600 seconds as a timeout should be more than enough. This happens even after a could of seconds. And I did a reload and force-reload of the configuration as well of course.

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• How to install Oxford Advanced Learners' 8 in ubuntu 12.04 LTS 64bit

  - by ioweyou

  I have bought Oxford Advanced Learners' 8 which come along with installation CD. In the cd they have linux installation option. But i can't install that in my ubuntu. When i run setup.sh from my terminal i get the following error message: The setup program seems to have failed on amd64/unknown Fatal error, no tech support email configured in this setup Does anyone have idea about installing OALD 8 in ubuntu 64 bit os?

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• Nautilus copies files but not directories from samba server on OS X

  - by camsolo

  I need to copy files from OS X on a Mac to Ubuntu on a PC. I enabled File Sharing on the Mac and selected the samba option. I was then able to connect to the samba server in Nautilus. Copying files was no problem, but copying directories failed, with the error message "is a directory". I can accomplish what I want using samba in the terminal. But it would be more conveninient to do this in Nautilus.

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• Forward Hostname via my router to another PC for debugging

  - by Markive

  Hi, My web service runs on for example: http://mydomain.com/mywebservice.asmx. This works great, but I have a PDA application which I want to debug it synchronising through this web service. Currently the only way I can do this is to debug the webservice running on the actual server which is far from ideal. What I would like to do is for any device connecting on my wireless network, if it requests mywebservice.asmx for this to forward the request to my development PC and for IIS to then handle the request and allow me to debug in Visual Studio. So device on the network that requests the hostname: mywebservice.asmx will his this PC.. I am at a loss to set this up on my router (Zoom ADSL X6), this is massively out of my scope but any help would be much appreciated

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• Small hiccup with VMware Player after upgrading to Ubuntu 12.04

  The upgrade process Finally, it was time to upgrade to a new LTS version of Ubuntu - 12.04 aka Precise Pangolin. I scheduled the weekend for this task and despite the nickname of Mauritius (Cyber Island) it took roughly 6 hours to download nearly 2.400 packages. No problem in general, as I have spare machines to work on, and it was weekend anyway. All went very smooth and only a few packages required manual attention due to local modifications in the configuration. With the new kernel 3.2.0-24 it was necessary to reboot the system and compared to the last upgrade, I got my graphical login as expected. Compilation of VMware Player 4.x fails A quick test on the installed applications, Firefox, Thunderbird, Chromium, Skype, CrossOver, etc. reveils that everything is fine in general. Firing up VMware Player displays the known kernel mod dialog that requires to compile the modules for the newly booted kernel. Usually, this isn't a big issue but this time I was confronted with the situation that vmnet didn't compile as expected ("Failed to compile module vmnet"). Luckily, this issue is already well-known, even though with "Failed to compile module vmmon" as general reason but nevertheless it was very easy and quick to find the solution to this problem. In VMware Communities there are several forum threads related to this topic and VMware provides the necessary patch file for Workstation 8.0.2 and Player 4.0.2. In case that you are still on Workstation 7.x or Player 3.x there is another patch file available. After download extract the file like so: tar -xzvf vmware802fixlinux320.tar.gz and run the patch script as super-user: sudo ./patch-modules_3.2.0.sh This will alter the existing installation and source files of VMware Player on your machine. As last step, which isn't described in many other resources, you have to restart the vmware service, or for the heart-fainted, just reboot your system: sudo service vmware restart This will load the newly created kernel modules into your userspace, and after that VMware Player will start as usual. Summary Upgrading any derivate of Ubuntu, in my case Xubuntu, is quick and easy done but it might hold some surprises from time to time. Nonetheless, it is absolutely worthy to go for it. Currently, this patch for VMware is the only obstacle I had to face so far and my system feels and looks better than before. Happy upgrade! Resources I used the following links based on Google search results: http://communities.vmware.com/message/1902218#1902218http://weltall.heliohost.org/wordpress/2012/01/26/vmware-workstation-8-0-2-player-4-0-2-fix-for-linux-kernel-3-2-and-3-3/ Update on VMware Player 4.0.3 Please continue to read on my follow-up article in case that you upgraded either VMware Workstation 8.0.3 or VMware Player 4.0.3.

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• Service layer coupling

  - by Justin

  I am working on writing a service layer for an order system in php. It's the typical scenario, you have an Order that can have multiple Line Items. So lets say a request is received to store a line item with pictures and comments. I might receive a json request such as { 'type': 'Bike', 'color': 'Red', 'commentIds': [3193,3194] 'attachmentIds': [123,413] } My idea was to have a Service_LineItem_Bike class that knows how to take the json data and store an entity for a bike. My question is, the Service_LineItem class now needs to fetch comments and file attachments, and store the relationships. Service_LineItem seems like it should interact with a Service_Comment and a Service_FileUpload. Should instances of these two other services be instantiated and passed to the Service_LineItem constructor,or set by getters and setters? Dependency injection seems like the right solution, allowing a service access to a 'service fetching helper' seems wrong, and this should stay at the application level. I am using Doctrine 2 as a ORM, and I can technically write a dql query inside Service_LineItem to fetch the comments and file uploads necessary for the association, but this seems like it would have a tighter coupling, rather then leaving this up to the right service object.

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• Nginx server_name is set to mydomain.com, so why is www.mydomain.com getting served too?

  - by Lorenz Forvang

  I have my Nginx conf set up as follows: server { listen 443 ssl; server_name mydomain.com; ... } When I load https://mydomain.com, the site loads fine. But when I load https://www.mydomain.com, the site loads as well. Why is this happening? I set up the DNS records using Amazon Route 53 as: A mydomain.com xxx.xxx.xxx.xxx (IP) CNAME www.mydomain.com mydomain.com So is a request to www.mydomain.com arriving at Nginx as a request to mydomain.com? If so, how do I differentiate requests to www.mydomain.com and mydomain.com at my server?

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• Hyperic HQ metrics not working

  - by Robin Weston

  I am having a problem with Hyperic HQ. Several metrics, some in IIS 6.x (Request Execution Time, Request Wait Time) and some in .NET 2.0 (Bytes in all Heaps, Exceptions Thrown per Minute), always show 0. If I view perfmon on the server itself I can see that the counters have values greater than zero. There are some metrics that work fine, such as Total Get Requests per Minute and the other IIS defaults. I have looked in the server logs but nothing obvious shows up. Please advise. Am happy to find more information if required.

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• nginx + Jetty - thousands of connections stuck in LAST_ACK

  - by virulence

  I have a FreeBSD machine with jails -- two in particular, one that runs nginx and another that runs a Java program that accepts requests via Jetty (embedded mode) Jetty receives upwards of 500 requests/sec constantly and there has been an issue lately where I will constantly have over 60,000 connections in the LAST_ACK state between nginx and jetty. Distribution of all connections (includes some other services, particularly php-fpm) root@host:/root # netstat -an > conns.txt root@host:/root # cat conns.txt | awk '{print $6}' | sort | uniq -c | sort -n 18 LISTEN 112 CLOSING 485 ESTABLISHED 650 FIN_WAIT_2 1425 FIN_WAIT_1 3301 TIME_WAIT 64215 LAST_ACK Distribution of nginx - jetty connections root@host:/root # cat conns.txt | grep '10.10.1.57' | awk '{print $6}' | sort | uniq -c | sort -n 1 3 CLOSE_WAIT 3 LISTEN 18 FIN_WAIT_2 125 ESTABLISHED 64193 LAST_ACK I'd prefer every request to fully close the connection. Clients requests are about 10 minutes apart from each other so connections must be closed. Some of the connections, tcp4 0 0 10.10.1.50.46809 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46805 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46797 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46794 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46790 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46789 10.10.1.57.9050 LAST_ACK tcp4 0 0 10.10.1.50.46771 10.10.1.57.9050 LAST_ACK etc.. On Jetty's end I've set maxIdleTime to 2000 -- before this all connections were in ESTABLISHED but they are now LAST_ACK On Jetty's end I've set Connection: close (i.e response.setHeader(HttpHeaders.CONNECTION, HttpHeaderValues.CLOSE);) Jetty never reports a lot of open connections -- always very few. PF/IPFW is not currently being used nginx - reset_timedout_connection is on I cannot figure out how to get nginx or jetty to forcibly close the connection, is this simply something that needs to be fixed in Jetty so that it fully closes the socket after the request finishes? Thanks a lot in advance EDIT: forgot my nginx config for the proxy setup- proxy_pass http://10.10.1.57:9050; proxy_set_header HTTP_X_GEOIP $http_x_geoip; proxy_set_header GEOIP_COUNTRY_CODE $geoip_country_code; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_set_header Connection ""; proxy_http_version 1.1; EDIT2: Forcing Jetty to close the connection via request.getConnection().getEndPoint().close() does nothing -- it's obvious the connection IS being closed (as it's in LAST_ACK) but why isn't it getting past this? Is Nginx keeping the connection open to the backend for some reason?

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• FBI, DOJ Falling Short on Identity Theft: Report

  <b>eSecurityPlanet:</b> "An audit by the Justice Department's Office of the Inspector General reveals that while the FBI and Justice Department have made "various efforts" to fight identity theft crimes in recent years, these initiatives have "faded as priorities" mainly because the agencies have failed to develop a coordinated plan to deal with what's become an epidemic of cybercrimes."

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• how to debug upstart scripts?

  - by poolie

  For some reason I'm getting an error during apport upgrades, the cause of which is % sudo service apport start start: Job failed to start Under sysvinit, I could debug this kind of problem by running eg sudo sh -x /etc/init.d/whatever start but that doesn't seem to map over to upstart. What should I try next? update: it turns out there is a workaround that will let the install proceed. But I'm still interested in the general question of how you would trace the script.

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• Windows Advanced Firewall certificate based IPSEC

  - by Tim Brigham

  I'm working on migrating from using IPSEC settings stored under the 'IP Security Policies on Active Directory' to using the 'Windows Firewall with Advanced Security' for my 2008+ boxes. I have successfully been able to get this set up using Kerberos authentication, however my openswan implementation on my Linux boxes is using certificates. Whenever I try changing the authentication method to computer certificate (using RSA and my root CA) the connection is bombing out. I've made this change at both a connection request policy and on the IPSEC settings on the root Windows Firewall with Advanced Security node. The windows event log shows the authentication request is taking place but failing negotiating a mode. What am I missing here?

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• Is realtime validation of username good or bad?

  - by iamserious

  I have a simple form for the user to sign up to my site; with email, username and password fields. We are now trying to implement an ajax validation so the user doesn't have to post the form to find out if the username is already taken. I can do this either on keyup event or on text blur event. My question is, which of these is really the best way to do? Keyup From the user POV, it would be good if the validation is done as and when they are typing, (on key up event) - of course, I am waiting for half a second to see if the user stops typing before firing off the request, and user can make any adjustments immediately. But this means I am sending way more requests than if I validated the username on Blur event. Blur The number of requests will be much lower when the validation is done on blur event, But this means the user has to actually go away from the textbox, look at the validation result, and if necessary go back to it to make any changes and repeat the whole process until he gets it right. I had a quick look at google, tumblr, twitter and no one actually does username validations on keyup events, (heck, tubmlr waits for the form to be posted) but I can swear I have seen keyup validations in a lot of places too. So, coming back to the question, will keyup validations be too many for server, is it an unnecessary overhead? or is it worth taking these hits to give user a better experience? ps: all my regex validations etc are already done on javascript and only when it passes all these other criteria does it send a request to server to check if a username already exists. (And the server is doing a select count(1) from user where username = '' - nothing substantial, but still enough to occupy some resource) pps: I'm on asp.net, MS SQL stack., if that matters.

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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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• Spreading incoming batched data into a real-time stream

  - by pr1001

  I would like to display some events in 'real-time'. However, I must fetch the data from another source. I can request the last X minutes, though the source is updated approximately every 5 minutes. This means that there will be a delay between the most recent data retrieved and the point in time that I make the request. Second, because I will be receiving a batch of data, I don't want to just fire out all the events down a socket once my fetcher has retrieved it: I would like to spread out the events so that they are both accurately spaced amongst each other and in sync with their original occurrences (e.g. an event is always displayed 6 minutes after it actually happened). My thought is to fetch the data every 5 minutes from the source, knowing that I won't get the very latest data. The original data would be then queued to be sent down the socket 7.5 minutes from its original timestamp – that is, at least ~2.5 minutes from when its batch was fetched and at most 7.5 minutes since then. My question is this: is this the best way to approach the problem? Does this problem have any standard approaches or associated literature related to implementation best-practices and edge cases? I am a bit worried that the frequency of my fetches and the frequency in which the source is updated will get out of sync, leading to points where no data will be retrieved from the source. However, since my socket delay is greater than my fetch frequency, the subsequent fetch should retrieve newer data before the socket queue is empty. Is that correct? Am I missing something? Thanks!

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• Bridging two sockets

  - by Itehnological

  I wondered if it is possible to bridge two incoming tcp sockets. For example: Client A -----> Server <----- Client B The the server sends it's magic to both clients and then they connect to each other bypassing the server Server Client A ----------><---------- Client B UPDATE: The idea is when those clients can't bind to ports to listen to still be able to create connection between each other with the help of the server. For example Client A and Client B have tcp sockets with the server. User A decides to chat with User B and creates a new tcp connection with the server with the request to bridge it with User B. The server sends that request to Client B and it also opens up a new tcp connection with the server for that chat line. Now when the server has both chat connections from A and B it bridges them and they can work without the server, and as a result the server won't have to process all the messages and files the two users share. That's the idea/

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