Cisco Bug: CSCuj17513 - Missing packets observed in AnyConnect virtual adapter with SSL
Mar 15, 2016
- Cisco AnyConnect Secure Mobility Client
Known Affected Releases
Symptom: Slow throughput of AnyConnect Windows/Mac clients w/SSL compared to IPSec. Further investigation shows that we are seeing missing packets in the Anyconnect Client Virtual Adapter when using SSL. Conditions: The SVC_UDP flow control drop can be reduced/eliminated using the following debugs on the ASA: debug menu webvpn 123 1 debug menu webvpn 121 3 128 128 debug menu webvpn 121 5 1 1 Customer reported (with the above debug) that it still takes twice as long to download a 25M byte file using DTLS comparing with IPSec. It turns out that there are missing FTP packets when looking at the client's virtual adapter captures.
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