On 19.6.2013, at 20.54, Ricardo Machini Barbosa ricardomachini@gmail.com wrote:
I am trying to do a proxy with dovecot to IMAP backend server that are using Microsoft Exchange 2013. I already did this with Microsoft Exchange 2007 and Microsoft Exchange 2010 and it works perfectly! But with Microsoft Exchange 2013 I can not perform LOGIN.
The error log message is: /imap-login: Error: proxy(user@domain.com.br): Login for exchange2013.domain.com.br:143 timed out in state=4 (after 30 secs, local=x.x.x.x:59640)/
My troubleshoot was:
- tcpdump on dovecot server side: I can see the commands sent/received by Microsoft Exchange. But no the "OK LOGIN" response.
/* OK The Microsoft Exchange IMAP4 service in xxxx is ready.// //C CAPABILITY// //L LOGIN "user@domain.com.br" "123456"// //* CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN STARTTLS UIDPLUS CHILDREN IDLE NAMESPACE LITERAL+// //C OK CAPABILITY completed./
Looks like Exchange 2013 IMAP has broken command pipelining :( See if it gets fixed by http://hg.dovecot.org/dovecot-2.2/rev/6e8bbc150fa9 and the attached patch on top of that? If it works, I'll commit that patch too.