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 ?

• Edited by huynhtrongnhatminh 2 hours 25 minutes ago

Hi

What AV or firewall do yo have on the slave vs the master? Are the services started on the slave?

Master and Slave using Symantec EndPoint 12 and all configuration are same

all POP and IMAP services started on master and slave

Are you getting password prompt when POP clients connecting to Exchange1?
Can you share the screenshot of the outlook error?

Hi 

Mostly this issues are related to AV or Firewall, check the services when you restart server

When setup client connect POP on slave Exchange, the connect failed

Connect POP on Master is working

Hi,
As suggested above can you uninstall/Disbale AV and try?
Please check this URL as well. There are few fixes
https://social.technet.microsoft.com/Forums/exchange/en-US/5f1a2cee-19ad-43e6-b281-bb7f094d8c09/pop-works-via-localhost-but-not-from-other-networked-machines?forum=exchangesvrclients