==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.4
- Linux/BSD distribution name and version: Ubuntu 14.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP (Switched to AD)
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? no
- Related log if you're reporting an issue:
====

Recently setup a new iRedMail server with Roundcube for webmail using the tutorial at :

http://www.unixmen.com/how-to-install-i … -in-linux/

along with :

http://www.iredmail.org/docs/active.directory.html

to setup AD authentication.

It works great internally.  I can access the admin website and the roundcube webmail site.  I can authenticate using my AD users and send emails as said users.  I can see all AD users in the GAL.

However...

If I open up my firewall to allow access to the webmail site, I can access it.  However I cannot login if attempting from an external location.  Using the same login that works internally, generates the error, "Invalid request! No data was saved."

If I look at the Dovecot log I see the following:

Apr 04 13:46:18 imap-login: Info: Login: user=<xxxxx@xxxxxxxxx.info>, method=PLAIN, rip=127.0.0.1, lip=127.0.0.1, mpid=2398, secured, session=<2dRy+60vQAB/AAAB>
Apr 04 13:46:18 imap(xxxxx@xxxxxxxx.info): Info: Disconnected: Logged out in=273 out=1009
Apr 04 13:56:26 lmtp(965): Warning: Killed with signal 15 (by pid=1 uid=0 code=kill)

Any idea how to make this work?