Remote Desktop on Port 21 works only in the lan

Discussion in 'Windows XP Work Remotely' started by Luis, Sep 23, 2003.

  1. Luis

    Luis Guest

    I have to connect at home (RD server on Windows XP Pro) from my office, so I
    have to use an open port in the office firewall.

    I have to connect via GPRS from my laptop, also.

    If I setup the RD server, let's say, on either port 3111 or port 8080 I can
    connect from my laptop/GPRS without any problem.

    If I setup the RD server on either port 21 or port 25 (open ports in my
    office lan), I can connect my laptop from the local lan, but I cannot
    connect from my laptop via GPRS.
    I get the following error message:

    Remote Desktop Disconnected
    The client could not establish a connection to the remote computer.
    1) Remote connections might not be enabled at the remote computer
    2) The maximum number of connections was exceeded at the remote computer
    3) A network error occurred while establishing the connection

    Point 1 is not, because I can connect from the lan where the RD server is
    Point 2 should be no sense for RD server on XP Pro, as far as I can see.
    Anyway, via GPRS, I always get error on port 21, but I never get error on
    port 3111.
    Point 3 may have some meaning if I had any firewall issue.

    I have a Kerio firewall at the server and an AtGuard firewall at the client.
    I disabled both firewall, but it didn't help.

    Furthermore, looking at the Kerio window for "Opened Connections at
    localhost" I can see that:

    - SVCHOST.EXE is listening on port 21 (that looks fine)
    - when I try to connect on port 21 from the laptop/GPRS, a new line is added
    displaying that SVCHOST.EXE is connected on port 21 (and the remote address
    and local port of my laptop/GPRS are displayed). But this lasts for just a
    second or two and then this new opened connection disappears (and the laptop
    returns the error I reported above)

    So I can't see how it could be a firewall issue (expecially when I disable
    both at the client and at the server).

    But why does it work fine (on port 21) if I connect from the laptop via lan,
    while it fails if I connect from the GPRS? Why laptop/GPRS works fine if I
    connect on port 8080?

    Any help will be greately appreciated.

    I would also appreciate any suggestion about other ports that may be opened
    at my office firewall.

    Thanks in advance.
    Luis, Sep 23, 2003
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