FTP Status Message Details?

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Hi all,

I having a difficulty finding details for an FTP error message I am
receiving in a batch FTP.
The message appears intermittently when trying to get a certain file, see
following log excerpt:

> get myfilez99.div pfile99  
200 PORT command successful.
550 myfilez99.div: error 23. 

Now I know from the IBM manual that 550 is "Requested action was not taken;
the file was not found (or no access)".
So I think the file I'm trying to get is use when I'm trying to get it, but
I don't know what "error 23" means.
Does anyone know where I find the meaning of the "error numbers". 

TIA for any help :-)

Cheers,
Ivan

P.S. The local client is AS400 and the remote server is OS/2 (or so it says)
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