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 with other clients (pcs, macs, ...) to the server. But with a iPad or iPhone client this warning appears and no connection is established.
How can I fix this?