I have not done it in a while, but the other server has to be accessible to the account CF is running under. For example, if the other server is set up as a mapped drive, the ColdFusion user account must have permission to access that drive. IIRC, the typical user account "System" (on windows), does not.
In other words, cffile only works on your local server (or any drives accessible on your local server).
Last edited by arrgh; Jan 30th, 2009 at 12:49 am.