It's hard to say what the cause of the failure might be, since you don't reveal the actual command being invoked. I guess it is something involving rsh(1). You might want to check the manual pages on Solaris and Linux for implementation differences, i.e. command line switches.

Then, I'd run that script under strace -f -ff -o script-out to check the resulting output for the forked rsh.

_($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                              /\_¯/(q    /
----------------------------  \__(m.====·.(_("always off the crowd"))."·
");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}