I have an asp page which connects to a SQL database, and requires login. If I attempt to the load the page in IE, I get absolutely nothing (just a blank white page with no error messages at all). If I attempt to load it in Firefox or Opera, I get the following error message:

Microsoft VBScript runtime error '800a0009'
Subscript out of range: '[number: 0]'
/KnowledgeBase/sos-kb.inc.asp, line 82

And here are the lines of code in question:

Line 80 Dim CurrentDomain, AuthInfo
Line 81 AuthInfo = Split(Request.ServerVariables("LOGON_USER"), "\", -1, 1)
Line 82 CurrentDomain = AuthInfo(0)

The site was working absolutely fine and for some reason, one day, it just stopped loading.

Any help would be appreciated.