We have an SBS 2003 server running Exchange 2003 and a few days ago users stopped being able to get email on their phones through ActiveSync. They are getting messages like network unavailable, or security certificate errors. Even when trying to re-setup the account or add new phones we get server unavailable on some androids, and on others "There are problems with the security certificate for this site" followed by "Unable to open connection to server, Security error occurred". I have taken many steps to try and resolve the issue including:
1. Checking 443 is open and pointed at the exchange server
2. Turning off our GFI Mail Essentials and testing
3. Using Server Manager wizard to re-create the certificate
4.Ran the Microsoft Exchange ActiveSync Connectivity Tests on their analyzer, and the failures that were produced per below:
5. Going through all these steps: https://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_1798-Exchange-2003-Activesync-Connection-Problems-FAQ.html
None of this has been successful, and I would greatly appreciate any help you can provide. All phones are affected, and PC's work normal.
The Microsoft Connectivity Analyzer is testing Exchange ActiveSync.
The Exchange ActiveSync test failed.
Elapsed Time: 795 ms.
Attempting to resolve the host name mail.xxxxx.com in DNS.
The host name resolved successfully.
IP addresses returned: xxx.xxx.xxx.xxx
Elapsed Time: 306 ms.
Testing TCP port 443 on host mail.xxxxx.com to ensure it's listening and open.
The port was opened successfully.
Elapsed Time: 253 ms.
Testing the SSL certificate to make sure it's valid.
The SSL certificate failed one or more certificate validation checks.
Elapsed Time: 235 ms.
The Microsoft Connectivity Analyzer is attempting to obtain the SSL certificate from remote server mail.xxxxx.com on port 443.
The Microsoft Connectivity Analyzer wasn't able to obtain the remote SSL certificate.
The certificate couldn't be validated because SSL negotiation wasn't successful. This could have occurred as a result of a network error or because of a problem with the certificate installation.
Elapsed Time: 182 ms.