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A layer in a map service that uses an ODBC connection is unavailable if the connection to the data source has been interrupted.
An ODBC connection is handled differently than an SDE connection. If the connection between ArcGIS Server and the ODBC data source is broken, restarting the map service is required to recover the data.
Restart the map service to restore the ODBC connection to the data source. Restarting the map service may be done using ArcCatalog or through ArcGIS Server Manager, as described below.