Error executing remote system command on an AIX Informix database from an NT Informix Server

Dear All, I realise there are many queries and answers already posted on a similar topic, but none seem to be able to get this working. I have two informix servers, one on Windows NT and one on AIX 4.3. Informix NT (7.31) Informix AIX (7.xx) I have a stored procedure on the unix box with a system command SYSTEM '/usr/bin/ksh /usr/bin/env > /tmp/mylog' I have set up the trust, so that I can connect to the AIX instance as informix from the NT server. I connect from the NT server to the AIX instance as informix and execute the procedure. I get the following error - 668 Command cannot be executed 127 No Primary Key I think that the 127 error number is from the shell execution. The /tmp/mylog file is created but with no values. Even if I replace it with an echo hello command I get an empty file. Having read one of Jonathan Leffler's responses, the SHELL environment variables needs to be set to the the Shell of the remote system. In my case that is 'set SHELL=/usr/bin/ksh' . I did this and it still didn't work. Am I missing further environment variables as I am executing the procedure from NT. Has anyone managed to do this? Many thanks in advance, Nick