pbx port not communicating

Hi folks

client server linux 7.1.0.2, master+media linux 7.1.0.2 .they can ping each other, telnet client 13782, telnet client 13724 works fine.

but telnet client 1556 fails.  port is swtiched OFF then ON several times. we cannot reboot this server due to client restriction for next 8 days.

is there a way\setting we can just use bpcd and vnetd for communication and run backup. ??????