Exchange Server Calendar not syncining with WM6.0

Posted on 2008-06-10
Last Modified: 2013-12-05
I have a Blackjack I with WM6.0.  Using the latest version of Active Sync I am able to sync email, contacts, tasks both up and down.  However, Calendar events only sync up to the server and not down to the phone.  During the sync, the counter showing the number of new calendar entries to be synced is correctly shown on my phone and it even counts off like it is working.  No events though make it to the phone.

We are running MS Exchange 2003
Question by:GPSATHOME
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LVL 15

Expert Comment

ID: 21755139
It could have something to do with security settings, or the anti virus program on the exchange server.

Author Comment

ID: 21755191
I would need more help as my IT admin has looked for a solution and so far has no suggestions.
LVL 15

Expert Comment

ID: 21755203
Are there any errors in the Exchange server log, or on your log?  Have you verified all settings are correct on your mobile device?
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Author Comment

ID: 21755220
No error messages on the server.

I have reset my phone many times using many combinations.  There really are not that many options on the phone side.  I agree with you that it is probabaly on the server or firewall side.
LVL 15

Expert Comment

ID: 21755348
could have something to do with the SSL certificate and the way the NAT is setup.

f you have static IP addresses and Exchange ActiveSync isn't working correctly, then the problem most likely is related to your SSL certificates. Typically, when you enable Exchange ActiveSync, wireless clients synchronize using SSL encryption. SSL encryption requires the use of an SSL certificate, which contains the server's fully qualified domain name (FQDN) and IP address. This can be problematic.

When clients attempt to synchronize, they connect to the NAT firewall, not directly to the Exchange Client Access server (CAS). The NAT firewall forwards the request to the server, which responds. The server attempts to establish SSL encryption using its certificate. However, the server's output is proxied back through the NAT firewall, which has a different IP address than the server.

Because the organization has one public IP address, that address is used for all outbound communications. The client thinks that the response is coming from the NAT firewall's IP address, rather than the Exchange server's IP address. The SSL certificate contains the server's IP address; therefore, the client thinks the certificate is invalid.

One solution for this involves creating a host entry on the mobile device that maps to the FQDN to which the SSL certificate is assigned. Windows Mobile devices don't support the use of host files, but you can add the necessary host record to the device's registry. Host information can be entered into the mobile device's registry at: HKEY_LOCAL_MACHINE\comm\tcpip\host.

Author Comment

ID: 21760027
Your firewall apporach may have some merit.  However, the Active Sync on the phone is not using an SSL connection.  Does this fact make any difference?
LVL 15

Accepted Solution

LegendZM earned 250 total points
ID: 21761962
It might, I've only ran Active Sync over SSL, I've never used it in a non-secure setting.

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