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-ERR Server Unavailable. 21 Exchange 2013

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Hello, 

POP3 service on the Exchange 2013 version of CU5 913.22 does not work. just stopped working, but do not know when as yet not launched it productively. 
I get an error in Outlook when connecting to or through Telnet during the "list". 
POP3 service is running on the backend servers. 
User has enabled POP3 mailbox. 
Connectory are set to default-path. 
Firewall allows traffic between Cas server and Mailbox server. 
Exchange is published by Kemp. All real servers, certificates are added. 

Met up with this version of this error? The net information regarding 2010 and adding an entry to the configuration file pop3, but in 2013 the ex has this entry. 

Please help.

Regards Lukas


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