Exceptions created on SEP 11.x based on TruScan detection (file hash) are not compatible with SONAR exception (New proactive engine)
When migrating from SEP 11.x to SEP 12.x some applications (usually In-House Application) start to be blocked again
TruScan exceptions created on SEP 11.x are based on SHA-1 so when migrating to SEP 12.x those exceptions won't be compatible with the new proactive engine (SONAR) that use SHA-2
A new exception to the blocked file need to be created again through SEPM 12.x console. The link below show how to create the new exception
Migration from SEP 11.x to SEP 12.x using the same environment
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