XFOR: EXCALCON May Fail to Connect to the CALCON Server (201280)

The information in this article applies to:

Microsoft Exchange Server 5.5

This article was previously published under Q201280

SYMPTOMS

Lotus Notes users may notice that all the Free/Busy (F/B) queries for Exchange Server users are failing. This might indicate that the remote procedural call (RPC) communication between the two systems is broken.

CAUSE

The Exchange Calendar Connector(EXCALCON) task on the Notes server communicates by means of RPC to the Calendar Connector (CALCON) on an Exchange Server computer. Although the Exchange Calendar Connector task is supposed to be able to re-establish RPC connectivity to the Calendar Connector, there is a small chance that it will fail during the attempt. This will result in all F/B queries from Notes for Exchange Server users to fail.

RESOLUTION

To resolve this problem, follow these steps:

Ensure that the Calendar Connector is back up and running, and that any network connectivity issues have been resolved.
On the Notes server, shut down the Exchange Server Add-on task.
Once the task has successfully shut down, restart the Exchange Calendar Connector Add-on task. For instructions on loading and shutting down the Exchange Calendar Connector Add-on task, refer to the documentation in the Exchsrvr\Connect\Calcon\Doc directory.

STATUS

Microsoft has confirmed that this is a problem in Exchange Server 5.5.

Modification Type:	Minor	Last Reviewed:	4/28/2005
Keywords:	kbbug kbpending KB201280