the enviroment is:
zabbix server internal:ip=internet ip <====>zabbix agend internet ip:internel ip

zabbix server can access zabbix agentd any port
zabbix agentd can access zabbix server 10051 tcp port
zabbix agentd 10050 port is up
from zabbix server telnet zabbix agentd other port ,it;s ok
from zabbix server telnet zabbix agentd 10050 not ok

Escape character is '^]'.
Connection closed by foreign host.

pls help me ......