I am new at programming. I am building a basic layout of a project where i got this problem. i have a scenario where i have several clients and a server. clients will be using a desktop C# application and on server sql database will be installed and they are far apart. how can I share data between clients and servers? please help
I am working on a trading application where we get streaming rates from the server within seconds or even milliseconds. The server and database run on the same Linux environment. The client is actually accessible from any location using JNLP/ Java web start. The user can directly download the JNLP file from a provided URL and launch the client application on his system and directly connect to the server regardless of where the server is located.
Now, the problem is when we are not using SSL, the application runs just fine. But with SSL slowness is observed which drastically reduces the performance of client application. However, the same thing is not observed when client and server both are running on the same machine (Windows). Does anyone have an idea about possible reasons which can cause this slowness?
We have this architecture:
Web Server: Web Application is deployed (html, javascript, css)
Application Server: WebApi is deployed
Problem is , I cannot make ajax request to reach Application Server because its behind firewall.
The Web Application is supposed to be used publicly to the internet users.
What changes should we do to make it work?
Should we move our Web Application to Application Server? But how would this be accessible on internet.
Thanks in advance for suggestions/advice.
You're going to have to put an exception in the firewall for the address of your web server... that way your web server can access the API but nothing else can (well, not quite nothing else - other stuff on that web server can but that can easily be solved by having your web app hosted on it's own/dedicated web server).
If your Web Application makes direct calls to the Web API endpoint (e.g. is a single page application that use a client-side javascript framework like AngularJS and/or it uses AJAX calls to your application server address), there is no way for your clients to access your API if you do not allow public access to your application server.
That's because your client resides inside your users web browsers.
You have to allow incoming connections to your Application Server through internet in your firewall.
Well, it all depends on how you look at things and how distributed your application should be (criteria like load, security).
In general, Web API might be just one more client (from your applications server perspective).
On the other hand, in robust/distributed system, you would have Web API only as an endpoint (controllers, mappers and things like that) that your mobile/ajax clients send requests to and then Web API communicates to Application server (where your business logic is).
Having Web API communicate to DB directly is not a good idea because as you add clients to application server (mvc, web api, services, etc...) then you have as many db access points as you have clients. So, its a code maintenance problem plus a problem of your view tier being aware of DB.
Ideally, you need Application server as a tier where all your business logic is and its the one that all your clients target (mvc web app, web api, desktop, services, etc...) and that is the one that should communicate to your DAL. Also, then you can set firewall rules on your application server to allow incoming traffic from trusted sources (your other servers) instead from the whole internet (ajax).
I'm using GeneXus X Evolution 3 and I want to install it in a production environment.
The web app works well, but the android one does not. It fails when starting.
Does the android app connect to the database hosted in the server? If so, how do I need to configure ports or what do I need to set in the datastore properties?
The native android application does not access your database. It accesses REST services hosted in your applications server and those connect to the database.
So what you have to set is the Services URL property.
If you have problems accessing the REST services, you may have some issues related to URL Rewrite or other common issues.
Hi,
My application is in Asp.Net MVC3 coded in C#.Net. I have published my solution and deployed it on IIS on the client machine. For this particular client we are not using any online server, we have published on client's local machine on IIS and from that machine only they will use it. The only problem we are having is regarding the security of the application as our client is accessible to the database as well as the application.
So under this scenario any technically aware person can take the published copy of the application and publish it again on their machine.
My query
How can i prevent the user from redeploying it on any other machine. Something like we have in the desktop application where the IP of the machine is taken and that particular application can run only on that machine.
I want my published content to be used only on the machine im have published and if the user wishes to copy the published content and deploy on other machine then it should not happen.
I have googled a lot regarding this but no result is returned in this regard.
Suggest how can i achieve the same.
Yes you can secure your ASP.NET MVC application to run on only 1 computer. Here are some companies that offer copy protection:
DeployLX by Xheo (http://xheo.com/)
Cryptolicensing by LogicNP Software (http://www.ssware.com/cryptolicensing/cryptolicensing_net.htm)
IntelliLock by Eziriz (http://www.eziriz.com/intellilock.htm)
ElecKey 2.0 R8 by Sciensoft (http://www.sciensoft.com/products/eleckey)