telnet on a nameserver on a port ??

[Kevin Darcy]

A telnet to port 53 should connect, but, whether it does or not, it
doesn't prove much of anything.

You might be better off capturing the packet data using a sniffer, and
verifying that the HP box is a) actually sending the packets to the
machine you think it is, b) properly constructing the packets, and c)
that the connection (if you are using TCP for some reason) is failing in
a "normal" way, e.g. client sends SYN, server returns RST. By the way,
are you specifically forcing the use of TCP via the RES_USEVC option?
ECONNREFUSED doesn't make a lot of sense for UDP, which is
connectionless. If you are forcing TCP, try not doing so.


- Kevin

Hetal Rach wrote:

> Hi friends,
>
> I had posted a question a couple of days back on my c
> program being unable to connect to a remote machine
> which is running a nameserver. here is another small
> question related to it..
>
> can i do a telnet to a machine on a specific port and
> get some data ?
> if so, what do i do for that..
>
> I'm enclosing the mail i had sent earlier.
>
> > Hi bind-users,
> >
> > I have a bind 8 nameserver running on a RedHat 6.2,
> > and i am
> > using bind API's to dynamically update the dns
> > entries. When run
> > from a solaris box, the program works fine, but when
> > run from an
> > HP box, res_send gives me ECONNREFUSED.
> > What I understnad from above is that res_send is
> > telling me that
> > the name server is not running on the remote host.
> But
> > nslookup
> > command works perfectly fine from the same box.
> >
> > ANy help regarding why this mught be occuring ?? or
> is
> > there some
> > HP specific stuff that i'm missing out ??
> >
> > I'm using HPUX 11.0 on D Class machines.
> >
>
> thanks,
> hetal
>
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