Event ID - 1016

Event Id1016
Description<name> proxy connection to <host name> for <host name> (mailbox <mailbox name>) failed with error <error code>.
Event InformationAccording to Microsoft:
Either the back-end server is not available or the configuration of the front-end server is incorrect. Or, the mailbox information for the client could be incorrect.
Verify that the back-end server is available. If the back-end server is available, verify that the configuration of the front-end server and the mailbox information are correct.
Reference LinksExchange (IMAP4SVC)

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