WEBVPN/SSL VPN doesn't work over WLANs

Unanswered Question
Apr 22nd, 2009
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Please can someone help me establish why only wired connections (outside the network/over the internet) are able to connect to SSL VPN?

If I use a wifi connection at any location outside of my network, then I cannot connect to my SSL VPN. I can only use wired connections.

I suppose this is an MTU issue, but I don't know where and I've tried many combinations of settings. How do I calculate the correct MTU?

Many thanks in advance for your support.


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Anonymous (not verified) Tue, 04/28/2009 - 05:47
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You can adjust the MTU size (from 256 to 1406 bytes) for SSL VPN connections established by the client with the svc mtu command from group policy webvpn or username webvpn configuration mode:

[no] svc mtu size

This command affects only the AnyConnect client. The legacy Cisco SSL VPN Client (SVC) is not capable of adjusting to different MTU sizes.

The default for this command in the default group policy is no svc mtu. The MTU size is adjusted automatically based on the MTU of the interface that the connection uses, minus the IP/UDP/DTLS overhead.


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