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Cisco Bug: CSCvi20707 - IOS SSLVPN/ISM: Anyconnect data traffic stops working with TLS-only transport

Last Modified

Sep 16, 2019

Products (1)

  • Cisco IOS

Known Affected Releases

15.5(3)M5

Description (partial)

Symptom:
IOS SSLVPN: Anyconnect data traffic stops working with TLS-only transport

Conditions:
Traffic over Anyconnect VPN terminating on an IOS Router stops working after sometime. It varies from minutes to hours. It is not triggered by large files transfers as in CSCup04062, but just a few pings back and forth over the tunnel can cause it.

All traffic seizes to flow however, the TX/RX counter on the client increments for a few seconds and then RX continues to increment while TX stops.

CPU Usage does not go up, no crashes are seen on the Router, memory utilization is low
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