Look at the top of members.asp, specifically this code, blocks people who are not logged in...
if strDBNTUserName = "" then
Err_Msg = "<li>You must be logged in to view the Members List</li>"
Response.Write " <table width=""100%"" border=""0"">" & vbNewLine & _
" <tr>" & vbNewLine & _
" <td><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """>" & vbNewLine & _
" " & getCurrentIcon(strIconFolderOpen,"","") & " <a href=""default.asp"">All Forums</a><br />" & vbNewLine & _
" " & getCurrentIcon(strIconBar,"","") & getCurrentIcon(strIconFolderOpenTopic,"","") & " Member Information</font></td>" & vbNewLine & _
" </tr>" & vbNewLine & _
" </table>" & vbNewLine & _
" <p align=""center""><font face=""" & strDefaultFontFace & """ size=""" & strHeaderFontSize & """ color=""" & strHiLiteFontColor & """>There Was A Problem!</font></p>" & vbNewLine & _
" <p align=""center""><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """ color=""" & strHiLiteFontColor & """>You must be logged in to view this page</font></p>" & vbNewLine & _
" <p align=""center""><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """><a href=""JavaScript:history.go(-1)"">Back to Forum</a></font></p>" & vbNewLine & _
" <br />" & vbNewLine
WriteFooter
Response.End
end if
EDIT - the code in red blocks them, the rest is just window dressing, so to speak.