RunNCF file from a Remote NetwareServer

I have a Netware 4.11 server that is running ARCserveIT. It backs up a Netware 3.20 server. I need to stop InoculanIT during backup because
it seems to slow the backup down when we leave it up. I went into the configuration for the backup and added PRE/POST commands as follows

PRE
\\servername\sys:system\istop4

POST
\\servername\sys:system\istart4

both commands fail with the following error

??? Unknown Command ???

is my command syntax correct or is this even possible?