_ (PORTINUSE, "lcl port in use") \
_ (IPINUSE, "ip in use") \
_ (ALREADY_LISTENING, "ip port pair already listened on") \
+ _ (INVALID, "invalid value") \
_ (INVALID_RMT_IP, "invalid remote ip") \
_ (INVALID_APPWRK, "invalid app worker") \
_ (INVALID_NS, "invalid namespace") \