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Updated June 2, 2016
This article addresses an issue that can occur if a trial version of NTA is placed on a server then removed. Afterwards, the interfaces in NPM cannot be removed.
The issue is caused by a trigger that was placed by the NTA install into the Interfaces table that is not removed when NTA is removed. The trigger requires that any deleted interface first be removed from the NetFlowSources table before removing from the Interfaces table.