Applies To:
  • CitectSCADA 5.10, 5.20, 5.21, 5.21 Service Pack A
Summary:
Citect server will hang on the error message box "Invalid handle" when a CTAPI client makes a really large trend query and the connection is killed after it gets time out. 

Solution:
CIT has confirmed this to be a problem in Citect for Windows versions 5.10 to 5.21. This problem has been fixed in version 5.21 Service Pack D. 
Keywords:
 

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