When many users uses a same webpage, will functionality in that webpage may behave abnormally?

Question

I have a website where it was hosted in 10 servers. From past somedays many users a using a particular webpage. so some functionalities in that particular webpage are not working as expected. They are behaving abnormally

For Example : I have a clear button on the page where user clicks on the button and it should clear all the checkboxes. But it was not clearing all the checkboxes. It was not a code error because we are using this webpage from many years.

More Details : *It is a Vb.Net code *.Net 1.1 version *VS2003 *We have hosted code in 10 servers, where if a server has heavy load it changes to other(Load Balancer). *Windows 2008R2 *IIS Version 7.5.7600.16385

My question is "As many users are using the webpage frequently will there be any thing happening" or any other reasons or bugs why this is happening. Any theoretical explanation for this issue please?

Answer 1

I could see that you are using VS 2003, VB.Net 1.1, Windows Server 2008 R2, and IIS 7.5 All the products you are using are out of support now.

Generally when many users use the web page then also it should work properly without any issues. As your project type is too old, it is difficult for us to comment on the possible cause of the issue.

One thing you could check is whether the website works fine on any of the 10 servers. If yes, compare the Server configuration and app settings with the Server that is having the issue.

See whether any Windows update got installed or if any configuration or code change occurred. It might give you some hints.

Check the browser console for errors. If you have the project then try to run it on your development machine to check whether it works. It could be possible, that some things got changed and you need to update your code according to it.