You have Symantec Protection Engine (SPE) configured for Secure ICAP and see the following error in the logs:
Failed to complete TLS/SSL handshake initiated by TLS/SSL client. Error code: error:1408F10B:SSL routines:ssl3_get_record:wrong version number
Protection Engine received a request that was not using TLS when configured to use Secure ICAP. This can happen if you enable Secure ICAP but do not configure your connector/client to connect via TLS/SSL before sending an ICAP request.
SPE 8.2
Secure ICAP
Ensure all clients/connectors are configured to connect via TLS/SSL before sending an ICAP request.