Hello,
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./
- tcpdump with telnet login on dovecot server side: Works fine.
/* OK The Microsoft Exchange IMAP4 service in xxxx is ready.// //a login "user@domain.com.br" "123456"// //a OK LOGIN completed.// //a logout// //* BYE Microsoft Exchange Server 2013 IMAP4 server signing off.// //a OK LOGOUT completed./
- Log verbose on Microsoft Exchange 2013. Look like that Microsoft Exchange did not receive the login command.
Someone already tried do this with Microsoft Exchange 2013 ?
See bellow some information about my dovecot configuration:
/# 2.2.2: dovecot.conf// //# OS: Linux 2.6.32-358.2.1.el6.centos.plus.x86_64 x86_64 CentOS release 6.4 (Final)// // //base_dir = /var/run/dovecot/// //disable_plaintext_auth = no// //listen = x.x.x.x// //mbox_write_locks = fcntl// //passdb {// // args = /etc/dovecot/dovecot-ldap.conf.ext// // driver = ldap// //}// // //protocols = imap pop3// //service imap-login {// // inet_listener imap {// // port = 143// // }// // inet_listener imaps {// // port = 993// // ssl = yes// // }// // process_min_avail = 4// // service_count = 0// // vsz_limit = 512 M// //}// //service pop3-login {// // inet_listener pop3 {// // port = 110// // }// // inet_listener pop3s {// // port = 995// // ssl = yes// // }// // process_min_avail = 4// // service_count = 0// // vsz_limit = 512 M// //}// //ssl_cert = </etc/dovecot/certificate/chained.crt// //ssl_key = </etc/dovecot/certificate/cert.key// //userdb {// // driver = prefetch// //}// // ///etc/dovecot/dovecot-ldap.conf.ext// //hosts = x.x.x.x// //dn = cn=admin,o=email// //dnpass = xxxxxxx// //ldap_version = 3// //base = o=email// //scope=subtree// //pass_filter = mail=%u// //pass_attrs = uid=user,=password=,=proxy=y,mailHost=host,=nopassword=y/
Thanks, Ricardo Machini