Re: Question about ident service

Tom Anderson <>
Mon, 24 May 2010 20:04:50 +0100
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On Mon, 24 May 2010, steen wrote:

On May 24, 4:52?pm, "John B. Matthews" <nos...@nospam.invalid> wrote:

Is your Java client sending the correct query request to the server, as
specified in section 4 of the RFC?



Well, I've tried to run a tcpdump on the test machine to see what goes
on, and I can see that the ftp server does ask the ident-daemon for an
ident, but when I connect to the server from java, the response is

You can see the relevant tcpdump output here:

The first 2 entries are when I connect to the ftp-server using telnet
and the resonse is as expected.

The last 2 entries are when I connect from java, and the response is

Any thoughts ?

1. Try a unix and/or networking group as well as this one; i doubt this is
a java problem per se.

2. What user are you running the java program as? root?

3. Does anyone have a .noident file in their home directory?

4. What does

netstat --inet -lp | grep $JAVA_PROGRAM_PID

say while the connection is open? Anything weird?

5. Has the java program sent anything over the socket at this point? Is it
definitely still open? I wonder if identd can't work out the owner of a
socket if it either hasn't been properly initialised yet (and there's some
kind of lazy initialisation going on under the hood) or it's already been
shut down.

6. If you're on linux, try running identd under strace and looking for
calls to sysctl - assuming you have a recent version of identd, that's how
it retrieves information about connections. If you're not, then there
should be some other combination of tracer and system call that does the
equivalent. There may be something in the output from that that indicates
why it doesn't spill the beans on the java program's connection.


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