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Mobile VPN client l2tp/ipsec GPRS mtu problem? | Solved

It was a setting in my GSM provider network

scenario:

windows mobile 6 pro with l2tp/ipsec --> over GPRS --> Cisco ASA

The tunnel is set up and the windows mobile pro device can be pinged by devices behind the ASA. The moment I try a tcp connection from the mobile device to a machine behind the pix the connection breaks.

So I measured the mtu to be 1270. Setting tcpmss to 1200 and the interface mtu to 1270 still doesn't help. I am thinking to make this a TAC call. I am too close to give up.

Your help is appreciated!.

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