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The PIX 500 Series Firewall with software version 7.x crashes intermittently with the "Thread name Dispatch Unit error" when ESMTP inspection is enabled
This problem occurs due to the presence of Cisco bug IDCSCse47150.
The PIX Firewall/Cisco Adaptive Security Appliance (ASA) running software version 7.2.1 can crash with the Thread name Dispatch Unit error when the Extended Simple Mail Transfer Protocol (ESMTP) inspection engine is enabled.
This problem occurs when the data length for segmented packets are miscalculated.
As a workaround for this issue, perform either of these steps: