Event ID - 1006

Event Id1006
SourceNotificationServices
DescriptionAn attempt to open the requested database failed.
Event InformationAccording to Microsoft:
Cause:

This error maps to SQL Server error 4060, which indicates that the current user does not have permissions to log in to the specified database. The event log entry for this error includes the description of the SQL Server error that caused it, which looks similar to the following: Cannot open database requested in login <database_name>. Login fails.</database_name>
User Action :
Check that the account used by Notification Services has login permissions on the database noted in the error message.
Reference LinksAn attempt to open the requested database failed.

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