iPad/iPhone AnyConnect VPN wrong MTU size

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http://serverfault.com – Someone recommended I should ask the same question here. This is the original question on Apple: http://apple.stackexchange.com/questions/47919/ipad-iphone-anyconnect-vp... I try to connect with a iPad (iOS 5.1) and the AnyConnect app to connect to a OpenVPN server on a Debian server. But this warning always appears in the OpenVPN log: WARNING: Bad encapsulated packet length from peer (5635), which must be > 0 and <= 1560 -- please ensure that --tun-mtu or --link-mtu is equal on both peers On the server side the tun interface mtu size is 1500 bytes. I can connect wit (HowTos)