I believe this is a a side effect of r19219.
I seem to recall first seeing it a couple months ago.
I have two characters who use the fax daily. I started seeing Premature end of file errors on one of the fax configuration files, a lot, and almost never with the first character to use the fax. I am reasonably certain I have tracked it down to a logic error. I am perfectly capable of coming up with a kludge to address the issue but my solutions seem to lack elegance. So I am posting in hopes veracity (author of r19219) wants to look at it.
Referenced code is in FileUtilities which was reworked.
The first time the fax configurations are updated, the remote versions are usually newer than the local versions so they are downloaded.
But the second time, it is often the case that the remote version has not changed. Nevertheless the old version is replaced with a zero byte file and processing that generates the Premature EOF message.
The problem is that line 426
will overwrite an existing file with a zero byte file.
OutputStream ostream = DataUtilities.getOutputStream( local );
But after that happens, line 428 is executed
downloadFileToStream( remote, connection, ostream );
downloadFileToStream makes a connection. If the response code is anything other than 200 or a triggered exception, the remote file is never read (into ostream) and thus the associated disk file remains empty. The error is repeatable any time the response code is 304 which essentially means the cached copy is not older than the remote copy.
My inclination would be to fix this by deferring the creation of the output stream until I was sure the local copy was invalid. But changing the signature to pass a file name instead of a stream effects relay file code. Copying downloadFileToStream and renaming a copy with a different signature seems inelegant and potentially harder to maintain. There is probably a way to refactor downloadFileToStream but I am not seeing it easily, so I will post here.
I will do something about this in a day or two but it won't be pretty :-)