Opened 19 years ago

Last modified 19 years ago

#930 closed Bug report

FileZilla does not use own ports

Reported by: zarggg Owned by:
Priority: high Component: FileZilla Client
Keywords: Cc: zarggg, Tim Kosse
Component version: Operating system type:
Operating system version:


When retrieving data from a remote host, the data is
sent to a local port that is not explicitly opened by

The result is that a firewall that unsolicited (or
unexpected) inbound packets will reject all inbound
data while attempting to use this program in a normal

Example: FileZilla opens port 3825 on the local
machine, but the data is being sent to local port 5004,
which is not open by any program on the local host. As
a result, the firewall on the local host rejects the data.

Change History (1)

comment:1 by Tim Kosse, 19 years ago

There must be a problem with some (maybe your) firewall or a
router between the server and the client.
FileZilla always opens the port before sending the address
to the server.

Lots of misbehaving routers and firewalls tend to inspect
ftp connections and modify the PORT and PASV commands and
their replies.

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