AnyConnect VPN -- very slow file transfer

[fairwinds764]

Using Secure Mobility Client 4.1.04011 on Windows 7, remote users are reporting that network drive file transfers are extremely slow--on the order of 150Kbps on an 8Mbps connection. It's taking users hours to move files. No problems at all with http file transfers or streaming video over VPN. We just implemented AnyConnect and this is much worse than our previous VPN solution. Any suggestions?

[Anthony Brandelli]

AnyConnect can use a variety of transports. Are you using IPSecV2? DTLS? Or just TLS?

I have AnyConnect deployed on some ISRs and the performance with DTLS enabled (UDP) is pretty decent. I also played around with IPSecV2, but didn't notice any performance gain. 

Beyond the above also check for MTU issues, this is a nice write up: https://supportforums.cisco.com/document/12318216/anyconnect-mtu

In short, check your MTU settings and if appropriate enable DTLS to start.