ActiveSync Tester Diagnostic

Diagnosis - It is not possible to establish communications from the Internet to the Exchange server.
The ActiveSync Tester has been unable to communicate with the Exchange server from the Internet and reported one of the errors below. ActiveSync mobile email requires that your Exchange server be accessible from the Internet. If you would like to use ActiveSync mobile email within your organization and do NOT wish to have your Exchange infrastructure accessible from the Internet, then you might like to consider using AccessMyLan. Try our Free Trial here »

If you believe you should be able to communicate with your Exchange server from outside your perimeter firewall, you should re-run the test from inside the firewall to identify if the issue is with the firewall configuration or with the Exchange configuration. With AccessMyLan your Exchange infrastructure can remain completely off-Internet, you do not need any open firewall ports, and you do not have to manage certificates.

Communication Error Analysis

  • Failed to resolve the DNS name.The Exchange server name entered is not valid on the Internet. Try entering the external name or IP address of the firewall.
  • Failed to connect to the server. [Connection Refused] This can be caused by the firewall not being configured to forward ActiveSync (SSL or non-SSL) traffic to the Exchange server or the Exchange server not being configured to accept SSL/non-SSL connections. Re-run the ActiveSync Tester form inside the network to verify the Exchange Server configuration.
  • Failed to connect to the server. [Connection reset by server] The firewall or Exchange server is resetting the connection. Re-run the ActiveSync Tester form inside your network to verify that the Exchange Server is configured correctly. If the Exchange server is configured correctly, make sure the Firewall is forwarding external ActiveSync traffic on the SSL port (443) or HTTP porty (80) to the Exchange Server.
  • Failed to connect to the server. [Host unreachable] On the machine running the ActiveSync Tester, issue a ping command to verify that the host name or address specified are correct.
  • Failed to connect to the server. [Timeout] This is usually due to a firewall configuration issue. Re-run the ActiveSync Tester from inside your network to isolate the problem to the firewall. The firewall will need to be configured to forward traffic on port 443 (SSL) to the Exchange server.
  • Failed to connect to the server. [Network unreachable] Most likely, the IP Address of the server is an internal address (such as 192.168.1.n) which is not routable on the Internet. The external name/address of the firewall must be specified, not the internal address of the Exchange Server.
  • Failed to connect to the server. The ActiveSync Tester was unable to establish a connection to the Exchange server. Re-run the test tool from inside your firewall to identify if the Exchange Server is configured correctly.
  • Failed to negotiate SSL with the server.The Firewall may not have a certificate configured or not be configured to forward SSL traffic to a server with an SSL certificate. Re-run the ActiveSync Tester from within the network to validate the Exchange server SSL configuration.

For more information on AccessMyLan and ActiveSync, consult the AccessMyLan Knowledge Base »

Disclaimer: All diagnostic and resolution information and associated links are provided as-is and AccessMyLan accept no repsonsibility for the accuracy or validity of any actions proposed. While feedback and suggestions are appreciated, we can not provide assistance to resolve generic ActiveSync configuration issues.