I get the following messages in the event log very
infrequently but it requires manual intervention.  I do
not understand why the user would be null.  Any
suggestions on locating the source of the problem?

An error occurred in BizTalk Server.

Details:
------------------------------
[0x1711] The server is shutting down because of a
database failure.

An error occurred in BizTalk Server.

Details:
------------------------------
[0x80004005] BizTalk Server failed to initialize a
connection to database: "InterchangeSQ" on
server: "MSNCRIUS".  :'Login failed for user '(null)'.
Reason: Not associated with a trusted SQL Server
connection.'
[0x1705] There was a failure creating the internal work
item. Make sure that SQL Server is running.

[0x1705] There was a failure creating the internal work
item. Make sure that SQL Server is running.

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