Server object, ASP 0177 (0×800401F3) Invalid class string

This is the error you would receive if a class string is passed to Server.CreateObject, but it is incorrect or the class string is not in the registry (i.e. the ActiveX was never registered with regsvr32)

For example:

set ftp = Server.CreateObject("Chilkat.InvalidFtp2")

produces this:

Server object, ASP 0177 (0x800401F3)
Invalid class string