POP3 issue connecting to Exchange 2013 server.

[ehofstede]

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Dear,

I got POP Fetching working just fine when HESK connected to my Exchange 2003 server. But I replaced the exchange 2003 server for an Exchange 2013 server and now it's not working anymore.
When I configure POP3 Fetching and I test the POP3 connection, this is the answer I get;
Connecting to (domain) ...
S +OK The Microsoft Exchange POP3 service is ready.
C USER helpdesk@ec-hosting.nl
S -ERR Command is not valid in this state.

It seems like Exchange 2013 reacts different to POP3 requests than Exchange 2003 does. It seems like 2013 expects a different command first, before the command "USER"

Does anybody know how to solve this?
Thank you very much!
Regards,
Erwin.

[Klemen]

Have you tried with "TLS Protocol" setting in HESK both ON and OFF?

If that doesn't help you may want to try some other authentication methods:
http://technet.microsoft.com/en-us/libr ... 41%29.aspx

Or it may even be a command size issue - in Exchange EMC on the Connection tab under Connection Limits try increasing "Maximum command size" value. By default it should be 40, try 128.

[ehofstede]

Thanks, I solved it.

The TLS setting didn't work, but on the Exchange server I set the pop3 authentication to basic authentication.
The webserver with the helpdesk software on it is the only server/machine that is allowed to connect to this exchange server using pop3, so that's ok by me.

Thanks for your help!