VMD-L Mailing List

From: John Stone (johns_at_ks.uiuc.edu)
Date: Fri Aug 13 2010 - 12:55:06 CDT

Shawn,
  If you're using the most recent version of VRPN, then you'll likely
have to compile your own VMD from source code, as we use a slightly older
VRPN library in our VMD builds, to go along with drivers for the
Sensable Phantom devices. None of the error messages you were getting
looked like they were caused by VRPN version mismatches, so this may not
even be the current source of your problems. My guess, from all of those
connection failure messages is that your firewall was, or is, interfering
with the socket connections between VMD and the VRPN server. To check
whether or not the VRPN server is configured correctly, I would recommend
that you try and run the VRPN "printvals" program and verify that you're
able to get it to connect to the VRPN server, independent of VMD.
If the printvals program doesn't work, then you must still have some
configuration problem or some kind of network problem or firewall issue.
If on the other hand, the printvals program works fine, then probably you
are having problems due to a .vmdsensors config issue, or the VRPN
versions being mismatched, etc. Try the VRPN printvals tests and let
me know what happens.

Cheers,
  John Stone
  vmd_at_ks.uiuc.edu

On Thu, Aug 12, 2010 at 02:25:26PM -0600, Shawn wrote:
> Thanks a lot John!
>
> Please bear with me as I have not figured out how to check the VRPN
> version number. Do you know how to do it?
>
> I did not compile VMD. The current VMD is original with the machine I am
> using. It's very possible it's a binary from your website. So should I
> compile my own?
>
> Thanks.
>
>
> Shawn
>
> On Thu, Aug 12, 2010 at 2:00 PM, John Stone <johns_at_ks.uiuc.edu> wrote:
>
> Shawn,
> What version of VRPN are you running? Are you running the stock
> VMD binaries we provide, or your own VMD compile? I ask because our
> stock VMD builds might be linked against a much older version of
> VRPN than the one you're using. Let us know which versions you're
> running
> and we'll try and give further suggestions.
>
> Cheers,
> John
> On Thu, Aug 12, 2010 at 01:48:31PM -0600, Shawn wrote:
> > After your crystal ball is fixed, please apply it to me coz I may
> be still
> > deep in the swamp. :)
> >
> > Anyway, thanks a lot for pointing out a possible direction!
> >
> >
> > Shawn
> >
> > Kohlmeyer <akohlmey_at_gmail.com> wrote:
> >
> > On Thu, Aug 12, 2010 at 3:28 PM, Shawn <sltsucb_at_gmail.com> wrote:
> > > Thanks Axel!
> > >
> > > We are using only one computer, and the Falcon is connected to
> the
> > same
> > > machine which runs the IMD. If it's a network config problem,
> is there
> > a way
> >
> > that is exactly why the request should come from localhost and
> not
> > from the assigned ip number.
> > > to identify and fix it?
> >
> > i have never seen this before.
> >
> > if i would know what is messed up, i would have answered.
> > sadly, i have no psychic talents and my crystal ball is still in
> repair.
> >
> > there are a bunch of things that can be done to debug these
> > kind of things. i would start by tracking traffic with tcpdump
> and
> > see what happens and where it goes. using strace or ltrace on
> > the various involved executable to narrow down the cause.
> >
> > axel.
> >
> > >
> > > Thanks!
> > >
> > >
> > > Shawn
> > >
> > --
> > Dr. Axel Kohlmeyer akohlmey_at_gmail.com
> > http://sites.google.com/site/akohlmey/
> >
> > Institute for Computational Molecular Science
> > Temple University, Philadelphia PA, USA.
>
> --
> NIH Resource for Macromolecular Modeling and Bioinformatics
> Beckman Institute for Advanced Science and Technology
> University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
> Email: johns_at_ks.uiuc.edu Phone: 217-244-3349
> WWW: http://www.ks.uiuc.edu/~johns/ Fax: 217-244-6078 

-- 
NIH Resource for Macromolecular Modeling and Bioinformatics
Beckman Institute for Advanced Science and Technology
University of Illinois, 405 N. Mathews Ave, Urbana, IL 61801
Email: johns_at_ks.uiuc.edu                 Phone: 217-244-3349
  WWW: http://www.ks.uiuc.edu/~johns/      Fax: 217-244-6078