|Component:||Microsoft Exchange Information Store|
|Message:||Accept clients on external interface <name> failed with error <error code>.|
The protocol used to access the database could not be initialized. You will receive the following message text in the Description of this event:
Accept clients on external interface Protocol failed with error code in hexadecimal. Possible values for the Protocol in order of the most commonly found are as follows:
The known causes of this event are an inability to contact a global catalog server, the internal and/or external Domain Name System (DNS) has been set up incorrectly, a DNS server cannot be located, and other types of incorrect network configuration.
Specific Cause 1
This issue can occur if the Exchange Server services have not been configured to run in the Inetinfo.exe tool; these services are configured to run in the Dllhost.exe tool, or they are not configured to run in any tool. This issue typically occurs if you removed Internet Information Services (IIS) from a computer that is running Microsoft Exchange Server, and then reinstalled IIS, but did not reinstall Exchange server.
There are several actions you can try to resolve this issue.
For information about reinstalling Exchange, do the following: