How To Eliminate Application Reload Delay Using Load Balancer
Dec 21, 2010
One issue with ASP.NET apps is that they periodically reload themselves, causing a long delay and possibly timeout for users who hit the site during that time.
This may not be a problem for small websites, but it can represent significant downtime for high-traffic sites, if users happen to get routed to node in the web farm that is restarting.
Can load balancers somehow "know" if an ASP.NET application domain on a specific server is restarting? Then, they can route traffic around this server until the application has completed restarting.
Currently, I have my load balancer ping a simple .aspx page on the site. If there is a delay or the page fails to load, the host is taken out of rotation. Is it possible to do a more targeted health check, perhaps at the IIS level rather than ASP.NET level?
We are using Two servers for our application managed by a load balancer. One of which server contains Windows server 2003 & other one contains Windows server 2008. When a request is served by windows 2003 server and its subsequent goes to the other one (2008 server). Users gets log out. Are we need same Operating systems on both systems because( when request served by 2008, and subsequent on 2003 is served without any issue).
I have a couple of servers and a load balancer. I want to show a server name which is currently serving the page.
I am using HttpContext.Current.Request.ServerVariables["SERVER_NAME"] and HttpContext.Current.Request.ServerVariables["LOCAL_ADDR"] but is shows the same data for all servers (load balancer information is shown but not the information about exact server name).
I'm creating web application behind load balancer. To this moment I configured it to store session in database but I'm not sure how should I handle session expiration. The problem is not sessions are not removed from database but Session_End event because I have to call some web service method in it.
Assuming Session_End is called when expires the thing I'm afraid of is situation when session is created on one server but finished on another. In this case I'm afraid Session_End on first server will be executed prematurely and I will call web service too early. What would you suggest in this situation?
Edit:
I remember some time ago reading about Sql Agent reacting to session end event and then performing custom code. Can anybody confirm that this solution is possible?
I have published a website and installed it on my local machine and it works fine, but when i install it on the both servers who controlled from the load balancer i got an error like the WebResource.axd not found. how can i resolve this problem? i have checked the IIS for axd mapping, the "Check that file exists" is unchecked for both servers.
We host a SaaS application on 4 windows 2008 servers loadbalancer via a LVS. We use infragistics and Ajax Control Toolkit on several pages, one page represents a list of people using a Web Datagrid, each time a person is clicked in the list, an Ultra Web Tab component is updated at the botom of the page with detailed information on that person. After a certain amount of clics on different people (number of clics can be between 1 and 5) Scriptresource.axd craches with the following error :
[Code]....
I don't get this error when I run my application on one server using the server's private IP adress. I tried to synchronize the dates of the dlls System.Web and System.Web.Extensions on each server, I still get the same error.
I haven't deployed behind a load balancer before. My customer has a WCF service built and tested on servers using a service model configuration that is relatively straightforward. It provides a service to return an image of a map for another application. To get the map, it calls other services.
The service was built in Visual Studio 2010 targeting the 3.5 framework. The customer is using IIS 7.5 and an F5 load balancer. When moving to the production server, the Web.config was changed to add the load balancer behavior and specify the endpoint to show the physical and logical address of the service:
[Code].....
There was a problem when the service was deployed to a server behind the load balancer. When I try to call the service from WCFStorm or WebServiceStudio I get the message "The provided URI scheme 'https' is invalid; expected 'http'.
The endpoints for the service itself look right to me. However in the development and testing versions of the config, the client section uses http instead of http, while on the production servers it uses the load balancer's https address. This seems like it should be obvious, but we're missing it.
Our server operations team has asked the web development team (ASP.NET) to provide a URL in our application, which the load balancer can ping to perform health checks.
What should be executed on this page? I think we should attempt a database connection to ensure connectivity between the web and database.
we have an web site access on PRODTEST Environment . We are facing an issue site works fine when we try to access the site using the Individual Server names (with Ip address).
I have four servers 2 App Server(behind firewall) and 2 webservers and each server is accessing through Load Balancer.
App Server is a modules for Data Access layer and webserver is for Presentation layer.
My Issue is My Load Balancer has Secure certificate installed but certificate is not installed on servers and I want to make cookie as secure in site , as per my understanding " cookie should be set as secure only for SSL site other ways new session will get create every time" so should I install SSL certificate on webserver to make my cookie as secure or will it work properly even if only Load Balance has SSL.
I have the following web farm setup in production server. Browser --> HTTPS --> Load Balancer --> HTTP --> webserver node F5 Load balancer handles off box SSL termination. It implies that SSL resides on F5 load balancer. Problem Statement: Ajax calls do not go through unless "Access data sources across domains" option is enabled in IE security settings.
I have the similar setup in staging server except F5 Load balancer. The ASP.Net application makes perfect AJAX calls on both HTTP and HTTPS. However, the staging server web farm use windows NLB and SSL resides on individual web server nodes
I have 3 servers where 1 of them serves as a load balancing server. In my ASPX page, I want to add a HTML comment to show the IP address or even host name of the server selected by the load balancer. I tried looking through IIS Server variables and tried using SERVER_NAME but that just returns the domain URL.
My website uses forms auth and I am trying to create a load balancer (hardware) rule which will keep track of sessions based on the aspxauth cookie. Is it safe assume that the value of the cookie is unique?
I notice on some sites i can login wrong which brings me to a login page. log in incorrectly again which brings me to a wrong password page (where i can log in) and if i login wrong again i dont increase my page history count. It takes exactly 2 backs no matter how many times i get it wrong and i dont see any pages in my forward history
I've got an ASP.NET MVC app that uses Linq to Sql for data access. Say I have two objects: An Order object that has a foreign key to a Customer object by CustomerID. So, in my Order class, you would see two properties: an int CustomerID field, and an EntityRef member accessible by a Customer property.When the edits or submits an Order, my MVC app will update the CustomerID field directly of the Order class, instead of updating the Customer property. This saves us from having to fetch a customer record, and I can use the default model binding code to fill the property automatically as long as the submitted form request has a customerID entry
I'm trying to use jQuery to load a PartialView. It does this fine at the first loading of the page. But then I need to be able to reload the PartialView when a save button is pressed. I get a reload, but this time the PartialView is all I get back. I.e. I don't get the PartialView loaded as a part of the main page, but rather as a page of its own. What am I doing wrong?
Here are the relevant parts of the jQuery in the View:
I am working on a web app that will heavily rely on configuration. The configuration is also will be written by another process or human. I am looking to get response on best practices in .net 3.5 on how to implement this case. I had used the configuration section of an early version of the Enterprise Library Applications Block. I really liked working with it but from what I hear it is discontinued in current versions. Hence the question... Need to be able to serialize collections, pick up file write event to reload new instance of config into memory.
We have an ASP.NET application deployed on 2 Application servers with load balancer server. It is using INPROC state management. The ADO.NET connection pooling is enabled with 50 as minimum connections and 100 maximum connections.
In Load testing (using load testing tool) when the application reaches to 50 users no more users can connect (login) to application the TPS reaches zero. No errors are logged in application log related to application or database. The sessions are working fine.
What I have is a masterpage with some tables and contentplaceholders. What I want in some pages is that a table be removed because i have 3 columns on 3 tables and i need 2 columns only(so minus one table). Now i can access the table and give it some css through code but what i give is width:0 (and visibility:hidden if ever successful). The table contains one contentplaceholder inside a <td>. I can also access the td.The problem is that the table (thus contentplaceholder) will not go away.
It remains as entity as extending the second column will just push it downside(behavior expected when the column3 with contentplaceholder is present). So is there a way to remove the table holding the contentplaceholder?Only thought is to hide it and push it right that i admit i haven't tried it yet, I suppose it would be easier to make another master page but the problem is that i want specific designs on many pages so if this does not work i would either have to make many master pages or just use simple pages.
In my application I am using a login screen. While a new user registers he has to fill the First name and Last name. There is a user search option. The details of the users will be shown in the user details page. Some users try to add html tags like </td></tr> with first name and last name. So after rendering from DB the page alignment is breaking. How to fix this problem?? How can I avoid html tags while entering the user details?
I have a login page and <authenticationmode="Forms"> in my web.config. Every before the login page is displayed, the browser pops up a login form. Is there a way to prevent that popup ?
I have two text boxes and one label control. All three controls are in different "td". Now what i want to do is , i am subtacting a value of textbox2 from the value of textbox1 and storing an answer in label control. I have written a code of subtracting values in the text changed event of textbox 2 and i am also getting an answer in label control. But when text changed event fires, it takes some time to execute which i reall dont like. this is why i want to use update panel to reduce that time. how can i use update panel in this kind of situation. i tried but not successded. so please write some code here related to my controls.
I have a form that is Ajax enabled (we use ajax to display a "processing" message). We're having problems with the customers double clicking the button so I want to disable the button upon the first click. I use the code below which works fine in IE but not in Firefox or Chrome.
In Chrome and Firefox, the button grays out but is still clickable. Do you see any problems with the code above? on a workaround or alternate method of disabling the button? I have thought about using session state to flag when the button is clicked and just ignore subsequent clicks but would rather disable the button entirely.
