You must re-upload the license after addressing proxy SSL certificate error in ATP
Last Updated December 12, 2018
When installing your license into ATP, there may be a communication issue if you are using a Network proxy that is performing SSL decryption or man-in-the-middle-type inspection that interrupts the transmission of the license data to Symantec's servers.
After the interception issue has been resolved, you must re-upload your license through the Global Settings page to resume ATP communication with Symantec servers.
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