vpn aes question

Hi all,

I am using freeswan developing vpn. when I use
aes-128, it works fine. But if I change to aes-192 or
aes-256, when I initiate client-to-gateway connection,
the connection can be established. But when the
gateway receives the ESP packet and process, the
gettdb function always return me a null tdb, so it
won't go to the hash and decryption routine.

Can anyone give me some advice?

Thanks in advance!

/z

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