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FTP doesn't work for one client

Discussion in 'General Discussion' started by elleryjh, Aug 19, 2003.

  1. elleryjh

    elleryjh Well-Known Member

    Apr 12, 2003
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    I got a complaint that FTP doesn't work from one of my clients. He has two accounts and says ftp doesn't work on either account. He uses multiple clients, multiple os's, multiple ISPs, multiple computers. It gives the message Peer server has been reset or Connection to remote host has been reset.

    Both PureFTP and ProFTP produce this result.

    I can access his ftp space fine, and no other customer has complained.

    Any ideas? Support Ticket Number:
  2. WhiteCollar

    WhiteCollar Member

    Mar 22, 2003
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    RE: FTP doesn

    Dear elleryjh,

    In the pure sense of the message
    it means a RST (reset) was sent in reply to a packet (probably a connection request) sent from the client to the server.

    This can happen if the client-server port pair (the service numbers of both ends of the connection) are identical. The idea is that for some time following a conversation, the server will not reuse the port pair, in case stray packets arrive after the connection has been closed. This can and does happen. The packets are sure to arrive within a short time, if they
    arrive at all, so most servers will RST them if they arrive within, say, 2 minutes after the connection was closed.

    In a normal environment, client-server port pairs are not reused that quickly.

    It is possible, with the ftp servers, to limit the range of server port numbers chosen for the PASV mode data connection. If you\'re doing this, and your server is busy, AND the same client comes back on the same port number (probably a bug on the client\'s side), then you will see a RST. Many firewalls and proxies offer a similar feature, so it\'s possible they can cause the same problem.

    The most likely causes, though, are a failure on the Ethernet software,hardware, hub, or local firewall or router. If everything looks normal, especially if the server thinks the client is still connected to an FTP session and/or a data socket, you most likely have some local problem.

    Regards, Support Ticket Number:

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