I did Install exchange 2013 Cluster DAG, and system work fine now
The problem is very strange , the POP and IMAP work fine on exchange master, telnet port 110 to exchange 2 as below:
But the POP3 and IMAP on exchange slave not working, telnet on port 110 exchange 1
All configuration on exchange 1 and 2 are the same
When i reboot exchange master, all the POP and IMAP client not working
Anyone can help me ?