Server is unreachable issue in UI v1.2


I just use the default function in GUI like the reboot button not provision yet. when clicking the reboot & commit.
it always shows me “server is unreachable”.
I already set the config [cwmp.connectionRequestAuth] value. verifying it via

a. in sever browser it pop up window and input correct username/password then show below page.
b. firewall rule already add ip-src, dst-port accept by CPE.
ACCEPT tcp – anywhere tcp dpt:7547 /* Genieacs port */
c. when show server unreachable, i am sure CPE not receive any package in my log.

any clue for this? seems connection request not reach CPE, and CPE not send 6 ConnectionRequest event to ACS yet.