You see the user number and user name, if one was supplied at the time that this user logged onto the Fileshare Server.
The Fileshare Server has closed all files that this user had open and rolled back any outstanding transactions pending for this user.
The Fileshare Client application, if still active, will be returned a 9/124 error on its next I/O operation.
Resolution:
Check that the Fileshare Client application is still running. Also check for any adverse network conditions that could have forced the connection to have been dropped.