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Re: [ESPResSo] Problem concerning vmd-connection

From: Axel Arnold
Subject: Re: [ESPResSo] Problem concerning vmd-connection
Date: Sat, 18 Apr 2009 20:45:35 +0200 (CEST)
User-agent: SquirrelMail/1.4.5

On Fr, April 17, 2009 18:22, Raimo Hartmann wrote:
> Hello!
> I'm trying to establish an online connection from espresso 2.1.0 to
> VMD 1.8.6 (precompiled version)
> If I use the "prepare_vmd_connection"-command the first frame of the
> simulations appers correctly in VMD but than the console of VMD prints
> an error that the connection over port 10000 can't be established. I
> tryed using different computers but still get the same problem. Is it
> necessary to use a certain version of VMD?


No, VMD 1.8.6 is definitely fine, I am using it myself.

That the first frame is shown only demonstrates that vmd is executing the
vmdstart.tcl that Espresso writes during prepare_vmd_connection; however,
the network connection does not seem to work. First you should check that
the network is ok, and you are not for example firewalled on port 10000.
To check, start Espresso, and establish an open VMD port using e.g.

part 0 pos 0 0 0
prepare_vmd_connection test 1 0

Then try telnet <host_running_espresso> 10000. Espresso should stop and
say "No go from VMD", otherwise, port 10000 is blocked. If you are running
vmd on the same host as Espresso, you can alternatively try "telnet
localhost 10000"; if that works, you should modify prepare_vmd_connection
in scripts/aux.tcl and replace "set HOSTNAME [exec hostname]" by "set
HOSTNAME localhost". However, you cannot connect to a remote Espresso
then, of course.


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