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### Instruction:
VPDN-6-UNKNOWN
### Response:
(Severity: 6), (Category: SUBSCRIBER), (Description: A VPDN session has been terminated. The category of the termination event is unknown), (Recommended Action: Please examine the human-readable error message that appears in the log and conduct the first level of troubleshooting based on the info in the message. If the root cause is still not clear, collect the required info and forward it to technical support)
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