I am getting ” Unable to negotiate TLS with this server” when trying to connect to exchange 2010 from imap_open() in PHP script. PHP ver is 5.2.17. I can connect to other mail servers but this one. IMAP on the server is set to “Secure logon. A TLS connection is required for the client to authenticate to the server” and is accessible from outlook or telnet on port 143.
I have read some posts on the internet that points to the bug in PHP but no resolution or workaround.