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Avalara Help Center

How can user access be prevented during Sage 100 maintenance?


You want to know how to prevent users from accessing Sage 100 during maintenance, such as when installing integrations.


Sage 100


  • Create a blank text file named instlock.txt in the MAS90\Home folder on the server to prevent any additional user access.
    • Must be logged into Sage 100 prior to creating the file if the maintenance is to be done inside of Sage 100
  • Make sure to remove the file once maintenance is completed.
    • During an installation the same file is placed in the MAS90\Home folder to prevent user access
  • Users will receive this message if they attempt to access "The administrator is currently maintaining the system.  Try again later."