Hey there, sorry to hear you're still stuck with the "Unable to connect to web server" problem even after trying all the usual fixes—total frustration, I get it. Let's go through some less obvious but actionable steps that might turn things around for you:

• Reset IIS Express configuration: Fire up Command Prompt as an admin, then run the command iisexpress /reset. This wipes out any corrupted config files that could be blocking the connection, giving IIS Express a clean slate.
• Check firewall/antivirus interference: Sometimes Windows Firewall or third-party antivirus tools block Visual Studio or IIS Express from establishing a network connection. Try temporarily disabling them (don't forget to re-enable afterward for security) and restart your project to see if that clears the issue.
• Verify port availability: Even if you changed the port, it might still be grabbed by another process. Use the command netstat -ano | findstr :<your-port-number> in Command Prompt to check if the port is in use. If it is, you can either kill the conflicting process via Task Manager (using the PID shown) or pick a brand-new port in your project settings.
• Repair Visual Studio: Corrupted VS components can cause weird connectivity glitches too. Open the Visual Studio Installer, select your VS version, click "Modify", then choose the "Repair" option. Let it run through the repair process and restart VS afterward.
• Inspect the hosts file: Navigate to C:\Windows\System32\drivers\etc\hosts (you'll need admin rights to edit it) and look for any incorrect entries related to localhost or your project's domain. If you spot something off, comment it out with a # at the start of the line or delete it entirely.

Fingers crossed one of these steps gets your project connected smoothly! If you hit any snags with any of these, feel free to share more details.

内容的提问来源于stack exchange，提问作者Hasan Hasanov