[horde] Problem syncing with AS on Horde webmail 5.2.16

[Louis-Philippe Allard]

Hello maillist.  I hope someone can help with AS.  The problem is that  
sync seems successful but nothing appears on the Android client.

Basically, I am running Horde webmail 5.2.16 on a centos VM server  
which is accessible ONLY on LAN at adress https://centos-horde/horde.   
I am using IMP as Horde's auth backend with my Gmail creds.

I have successfully setup AS as per the wiki's instructions.

I have also setup the exchange account properly (?) on the Android  
client.  Client is a Nexus 6P phone.

I can see the client device under Administration > ActiveSync Devices

User:  lp.allard.1 at gmail.com
Device: Android
Last Sync Time: October 31, 2016 18:53
Status: Not Provisioned
Device Information:
ID: ANDROIDCXXXXXXXXXXXX
POLICY KEY: 0
USER AGENT: Android-Mail/6.9.25.134833125.release
EAS VERSION: 14.1
FORCED MULTIPLEXED BITMASK: 15
CACHED HEARTBEAT (SECONDS): Unavailable

The exchange account was added on the client by going in Settings >  
Accounts then adding an Exchange Account.

The first "gotcha" was that Android wouldn't let me use my Gmail  
adress as username (the one I currently use to login to Horde) as it  
was already in use with my GMail account on the device (Exact message  
was:  You're already using this username for the account Gmail).  I  
used a fake email like user at horde.localdomain to get past this step.

Then I clicked on "Manual setup"

Then I clicked on "Exchange" and entered my Gmail (and Horde)  
password.  Then clicked "Next".

Then I changed the Domain\Username field to my Gmail address (which is  
also the Horde username), entered my Gmail password, changed the  
server field to "centos-horde".  The port was left to default 443, and  
the security type was changed to TLS/SSL (Accept all certs) because  
other security settings didnt allow rto securely connect to the  
server...

I finally hit Next, then was presented with the Sync options which I  
left all checked and hit Finish.

After that, the AS sync process started on the server (using tail -f  
on the AS log file I saw tons of text going by).

One thing I noticed in the AS log is this coming back over and over again:

2016-10-31T19:44:08-04:00 androidcXXXXXXXXXXXXX INFO: [27189] Maximum  
memory usage for ActiveSync request: 19968048 bytes.

After the sync completes, Calendar is empty, task list is empty, and  
contacts are empty...

Thanks
  Louis-Philippe Allard
lp.allard.1 at gmail.com
Sent using Horde Groupware on GNU/Linux