Normally exceptions are used if Symantec Endpoint Protection is detecting benign files as malicious. This is known as a False Positive.
Some software vendors will also recommend creating exceptions for their application files.
In the case of a False Positive situation, please submit the detected file to our "SymSubmit" site for analysis.
How to set up Exceptions for a Managed Client:
How to set up Exclusions for an Unmanaged Client: