Unable to start debugging on the web server. Logon failure: unknown user name or bad password...

Here is an even better solution than using locolhost with some bugus port.  There was a security change in SP1 for Windows 2003 that prevents debugging on anything but localhost.  There's an obscure KB article about it here:

http://support.microsoft.com/?kbid=896861 

The fix is simple:

1.	Click Start, click Run, type regedit, and then click OK.
2.	In Registry Editor, locate and then click the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
3.	Right-click Lsa, point to New, and then click DWORD Value.
4.	Type DisableLoopbackCheck, and then press ENTER.
5.	Right-click DisableLoopbackCheck, and then click Modify.
6.	In the Value data box, type 1, and then click OK.
7.	Quit Registry Editor, and then restart your computer. from : https://forums.asp.net/t/927517.aspx?Unable+to+start+debugging+on+the+web+server+Logon+failure+unknown+user+name+or+bad+password+