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Cisco Bug: CSCur29569 - Anyconnect NAM not stable for wireless usb card

Last Modified

Nov 27, 2020

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases


Description (partial)

Anyconnect NAM is not working stable when using wireless usb cards.

MAB/dot1x connection is established, ip address is assigned but then we have packet drops. Packet drops are occurring every 3-5 minutes and around 20-30 packets are dropped. In the wireshark (capture taken from station) we can see that response for icmp echo request arrives around 1 minute later (which is not true, response reaches station immediately but it looks like anyconnect/drivers are having problems with processing)

With native windows supplicant everything is working perfectly fine.

Tested with: Windows 7 SP1, Windows 8, Windows in Vmware/Virtualbox (different types of usb controlelrs)
Tested with the following cards:
Ralink Technology, Corp. RT5572 Wireless Adapter (used by TP-Link  WDN3200)
Tested with Anyconnect NAM
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