Forum Post: KEY_EST_INIT Problem

Dear All,

I am facing problem while initiating a key est init request from a router to and ESI device.

I am using UTIL interface of ZNP specification. 

KEY_EST_INIT Request from Router to ESI:
FE 06 27 80 01 00 0A 02 00 00 A8

SYNC Response:
FE 01 67 80 00 E6

ASYNC Response from ESI
FE 03 44 80 E9 0A 02 26

Problem is "E9" in the ASYNC response. which indicate the ZmacNoAck .

Can somebody please point out the possible causes for this behaviour.

TIA,

Rakesh