FAQ.Does any one have additional information on URL Access error codes?
Feedback.

Answer: I guess you are using the URLaccess manager...
Example:

Select Case error
Case -30770
  Return "Invalid URL"
Case -30771
  Return "A dialog box with a progress indicator is already displayed"
Case -30772
  Return "Destination file already exists"
Case -30773
  Return "Invalid URL format"
Case -30774
  Return "Transfer protocol is not supported"
Case -30775
  Return "Server is busy"
Case -30776
  Return "Server identification has failed"
Case -30777
  Return "The value of the property is not yet available"
Case -30778
  Return "Invalid or undefined property"
Case -30779
  Return "The buffer is too small to receive the requested property"
Case -30780
  Return "The property cannot be set"
Case -30781
  Return "Invalid call"
Case -30782
  Return "Resource file empty"
Case -30783
  Return "Extension fails to load"
Case -30784
  Return "Invalid configuration"
Case -30785
  Return "The URL Access Manager is not available"
End Select

Notes: To connect to a server that requires a password and username, call URLaccess with 128+16 as the openFlag.