interprocess communication errno host number net1

[unixac]

When I receive errors for IPC problems:
"send_ipc: XXXXX failed to host 17 via net1: fd=0 errno = Bad file number (9)" or "send_ipc: XXXXXX failed to host 17 via net1: fd=0 errno = Not a stream device (60)"
What does host 17 mean? I only have 10 hosts in the system configuration.