Supposing that while debugging with VWD the ASP .NET Development server runs at port 4754. (tray icon).
The page for debug is opening at http://localhost:4750 and every time i have to type in the address bar the correct address. http://localhost:4754
In other words the http://localhost port, is always the ASP .NET Development server port minus 4
Why the page for debug is not opening in the same port with the one shown in the tray icon?
Are you using ESET security?
I had this problem, but I never was able to fix it. I came across this link though, maybe it will help you. Also be sure to check the comments on that page in case the main article didn't resolve the issue.