Stupid! Stupid! Stupid! Not for the first time I have got it wrong. I was posting to a different IP address, very similar node name, so the NSDIR entry was not being referenced by my program. It has raised a timeout error on IPCRECV following the IPCDEST and IPCCONNECT which I am now having to look at. What a day! Can a system respond to fast for IPCRECV to pick up?