libURL error 10053?

[Richard Gaskin]

I have a WebMerge customer whose reporting that he's getting an error 
10053 when he tries to FTP.  WebMerge uses libURL v1.0.13.

I can't reproduce the error here, and the user claims that the same 
settings as he's using in WebMerge work well when FTPing from the 
command line (he's using WinXP).  We have a few hundred customers 
happily FTPing with WebMerge, so it must be something specific to his 
server or his login/password.

I can't find reference to what error #10053 could be.  Any clues as to 
how to diagnose this further?

TIA -
-- 
  Richard Gaskin
  Fourth World Media Corporation
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