By default, Symantec Protection Engine blocks files that produce an Internal Server Error. You can modify the AllowAccessOnScanError command to permit access to these files.
When you enable this setting, a Warning level log event is generated each time access is permitted to files that produced an Internal Server Error. This log event is sent to all logging destinations except SSIM and SNMP.
This command applies to the ICAP protocols and RPC protocols only. For ICAP, the client must permit the Allow: 204 ICAP header return code with the request.