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Parallel remote kernel: MathLink connection not active

• To: mathgroup at smc.vnet.net
• Subject: [mg121573] Parallel remote kernel: MathLink connection not active
• From: Andrew <haines42 at gmail.com>
• Date: Tue, 20 Sep 2011 06:10:02 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hi all

I'm struggling to set up parallel remote kernels, and searching around
it seems that I am not alone but I could not find a solution.

In my case, both client and server are running Windows; the server is
running CopSSH and I have successfully set up a single remote kernel
using mathssh:

java -jar "`mathssh`" user@server "math -mathlink -LinkMode Connect -
LinkProtocol TCPIP -LinkName `linkname` -LinkHost x.x.x.x"

where x.x.x.x is the client's IP. I can set a notebook to use this
remote kernel, and executing $MachineName gives the name of the
server, so everything is working as expected.

However, I can't seem to get the same to work for parallel kernels. I
have pretty much just copied the configuration across and tweaked the
replacements:

java -jar "C:\Program Files\Wolfram \
Research\Mathematica\8.0\SystemFiles\Java\WolframSSH.jar" user@`1`
"math -mathlink -LinkMode Connect -LinkProtocol TCPIP -LinkName `2` -
LinkHost x.x.x.x -subkernel -noinit >& /dev/null &"

However, when it fires up, the server kernel spits out the error
LinkConnect::linkc:
  LinkObject[55512 at x.x.x.x,55513 at x.x.x.x, 1, 1]

which "is generated by an attempt to access a MathLink connection that
is not active".

Any ideas?