Description:
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---
From manual page: http://www.php.net/function.imap-open#refsect1-function.imap-open-description
---
Function fails to connect to Exchange 2007-2010 IMAP or POP.
See related: https://bugs.php.net/bug.php?id=33500
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=161826

Problem still not solved.
Using the new DISABLE_AUTHENTICATOR parameter, the server ignores the options to  returns: "Array ( [0] => Unknown GSSAPI failure: An invalid name was supplied [1] => GSSAPI mechanism status: Hostname cannot be canonicalized [2]..."
Problem noted in support forums in many web applications that try to read an Exchange POP or IMAP mailbox: sugerCRM, GLPI, Sit, OsTicket, Kayako, etc.


Test script:
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<?php
imap_open('{mailserver.com/novalidate-cert/ssl}','username','password',null,1,array(DISABLE_AUTHENTICATOR=>array('GSSAPI', 'PLAIN')));
var_dump(imap_errors());

	


Expected result:
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bool(false) 
The code should open a connection string to the Exchange imap server.

Actual result:
--------------
array(6) { [0]=> string(52) "Unknown GSSAPI failure: An invalid name was supplied" [1]=> string(57) "GSSAPI mechanism status: Hostname cannot be canonicalized" [2]=> string(56) "Retrying PLAIN authentication after AUTHENTICATE failed." [3]=> string(56) "Retrying PLAIN authentication after AUTHENTICATE failed." [4]=> string(57) "Can not authenticate to IMAP server: AUTHENTICATE failed." [5]=> string(49) "[CLOSED] IMAP connection broken (server response)" }