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I'm using PureFTPd on MacOSX (Snow Leopard, not server version). When trying to access the FTP account from the outside via dyndns (e.g. using https://www.wormly.com/test_ftp_server) the connection always times out the FIRST time. When I try AGAIN in the next few seconds it works.

What is this about?

I have forwarded the ports to my apple router and tried disabling the OSX firewall as well.

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closed as off-topic by Braiam, Anthon, slm, Timo, Zelda Feb 14 at 17:08

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions describing a problem that can't be reproduced and seemingly went away on its own (or went away when a typo was fixed) are off-topic as they are unlikely to help future readers." – Braiam, Anthon, slm, Timo, Zelda
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What ports have you forwarded? If it's 21/tcp and you don't have an FTP-aware firewall, you might want to try turning on ‘passive mode’ on your FTP client. –  Alexios Jun 22 '12 at 11:36
    
I have forwarded 20,21,22 and also 30000-60000 for testing purposes. The FTP Server switches from active to passive mode when logging in: > EPSV * Connect data stream passively < 500 EPSV command not understood * disabling EPSV usage > PASV < 227 Entering Passive Mode –  Dennis Wehrmann Jun 22 '12 at 12:43
1  
Is it possible the device running the FTP server goes to "sleep", and your first connection attempt triggers WOL event, effectively waking the device allowing the subsequent attempts to go through? –  Tim Jun 22 '12 at 13:12
    
Hi Tim, good idea but that can't be the cause of the problem. I'm testing FTP access while the device is definitely awake. I guess the problem is related to the router / ports but I can't put my finger on it. –  Dennis Wehrmann Jun 25 '12 at 7:04
    
Is the problem still reproducible? –  Braiam Feb 14 at 16:11
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1 Answer 1

Which firmware version do you have on your Airport? Try updating its firmware; there are many people who have reported problems with port forwarding in at least version 7.5.2 that are fixed in the 7.6 series.

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