Figure 1 explains
the syntax for TCP/IP message IDs on the host:
Figure 1. Syntax
for TCP/IP message IDs
The product identifiers (ppp) for TCP/IP
are EZA, EZB, EZD, EZY, EZZ, and SNM. The number (nnnn)
indicates a unique 4-digit numeric value assigned to the message by
product. The type code (t) indicates the severity assigned
to the message.