Fix ‘This Page Isn’t Working’ Error for ASP.NET Core App on IIS [2025 Guide]
Having trouble accessing your ASP.NET Core app hosted on IIS with your custom local domain (e.g., itech.com)? Instead of loading, the browser shows “This page isn’t working” or the site fails to respond.
00:00 Fixing “This Page Isn’t Working” in ASP.NET Core on IIS
00:05 Open IIS Manager to Check Site Configuration
00:15 Refresh the IIS Site in Browser (Still Not Working)
00:24 Explore the Site Files and Structure in IIS
00:30 Open web.config File in ASP.NET Core Project
00:48 Add EnvironmentVariables to web.config (Setup for Debugging)
01:21 Enable Development Environment Flag in web.config
01:39 View SQL Server Exception in ASP.NET Core App
01:42 Read Detailed SQL Exception for Troubleshooting
01:45 Start Fixing the SQL Server Connection Bug
01:54 Set Custom SQL Credentials in Connection String
02:30 Problem Solved – ASP.NET Core App Working on IIS
02:50 TechWinsRecord Channel Update Announcement
06:00 End of Tutorial – Thanks for Watching!
In this video, we’ll show you how to troubleshoot and fix This Page Isn’t Working that prevent your ASP.NET Core app from loading on IIS using a custom domain:
How to configure IIS bindings properly for your domain
Editing the Windows hosts file to map your domain to localhost
Fixing port conflicts and ensuring the app is running
Setting up the right application pool identity and permissions
Checking firewall and SSL settings that can block access
Perfect for developers deploying apps locally on IIS with custom domains.
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