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AnyConnect VPN session disconnect and reconnect

I have a cisco ASA 5525-X firewall, configured to accept AnyConnect VPN client (IKEv2) connection.


Anyconnect VPN client can successfully login.

During the 1st 10 minute after login, Anyconnect VPN client will lost VPN connection for a few seconds (ranging from 3 seconds to 10 seconds), then it automatically reconnect back. After that, no more connection lost happen.

Connection lost happened to multiple labtops. So far, at least 4 labtops demonstrate the same problem. 


It doesn't affect network operation, but it gives unpleasant impression to the users. 


I tried monitoring firewall logs from ASDM, no error log detected.

I use Wireshark to capture traffic at client side, also no error detected. 


Can idea how I can continue troubleshoot this problem? 

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