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Re: CFReadStreamOpen 550 error
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Re: CFReadStreamOpen 550 error


  • Subject: Re: CFReadStreamOpen 550 error
  • From: Mike <email@hidden>
  • Date: Sun, 02 Mar 2008 15:31:50 -0700

False alarm. I was getting distracted with the 550 error in the FTP
domain which is TLS, etc. when in fact it was a 550 dir not found error
because my ISP puts an additional directory at the root before my files.
I had missed the extra dir name in my URL.

It generally works for the most part although very rarely on occasion
the read on the stream will fail. I have mitigated this somewhat by
setting the flag to reuse connections to false to force a new connection
each time. But it does still fail for inexplicit reasons on very rare
occasions in which I just break out of my wait loop and tell the user to
try again. This is good enough for now.

Thanks.

Mike

Mark Pauley wrote:
What does the traffic on the wire look like?

Can you

sudo tcpdump -s0 -A host <ftphost>

and attach the output while you connect?


I'll see if I can fake up a server that thinks for a long time before responding...



_Mark



On Feb 29, 2008, at 10:38 PM, Mike wrote:

I have a very slow FTP server I am trying to download a file from. Logging in in passive mode can take anywhere between 30 seconds to 2 minutes, but login never fails given enough time.

When I open a CFReadStreamRef for downloading a file via CFReadStreamCreateWithFTPURL and then loop checking CFReadStreamGetStatus immediately after opening it, it first returns CFStreamStatusOpening and a few seconds later fails with kCFStreamStatusError, which I believe is because the FTP server doesn't respond immediately.

Is there a way to set the timeout on the stream's opening so that it will wait longer for really slow servers? I've verified everything else is correct: user name, password, path to file, the stream gets created and opens properly.

Here is my code:

// Make URL to file...
ftpURL = CFURLCreateWithString( kCFAllocatorDefault, kmaCurrentVersionsFIleURLCFString, NULL );
if( ftpURL )
{
// Make Read stream...
readStreamCFRef = CFReadStreamCreateWithFTPURL(kCFAllocatorDefault, ftpURL );
if( readStreamCFRef )
{
// Set properties
streamPropertySet = CFReadStreamSetProperty( readStreamCFRef, kCFStreamPropertyFTPUserName, CFSTR( "michael1" ) );


streamPropertySet = CFReadStreamSetProperty( readStreamCFRef, kCFStreamPropertyFTPPassword, CFSTR( "a1a1a1" ) );
streamPropertySet = CFReadStreamSetProperty( readStreamCFRef, kCFStreamPropertyFTPUsePassiveMode, kCFBooleanTrue );
streamPropertySet = CFReadStreamSetProperty( readStreamCFRef, kCFStreamPropertyFTPResourceSize, (CFNumberRef)kmaCurrentVersionsFIleSizeInBytes );
streamPropertySet = CFReadStreamSetProperty( readStreamCFRef, kCFStreamPropertyFTPFetchResourceInfo, kCFBooleanFalse );
streamPropertySet = CFReadStreamSetProperty( readStreamCFRef, kCFStreamPropertyFTPFileTransferOffset, 0 );
streamPropertySet = CFReadStreamSetProperty( readStreamCFRef, kCFStreamPropertyFTPAttemptPersistentConnection, kCFBooleanTrue );
// Open the stream...
streamOpened = CFReadStreamOpen( readStreamCFRef );
if( streamOpened )
{
// Wait for stream open success
while( ( streamStatus != kCFStreamStatusOpen ) && ( streamStatus != kCFStreamStatusError ) )
{
// Wait for open to complete...
streamStatus = CFReadStreamGetStatus( readStreamCFRef );
}


I get kCFStreamStatusError at this point and CFReadStreamGetError returns 6 and 550 for the domain & error which appears to be "SSL/TLS required on the control channel". Is there anything I else I need to set in order to avoid this error?

Thanks,

Mike
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 >Re: CFReadStreamOpen 550 error (From: Mark Pauley <email@hidden>)

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