[Openswan Users] Invalid argument NULL

[Jiva DeVoe]

Am trying to set up a couple of crypto_NULL tunnels... (I know, insecure,
that's ok... )  I have the module loaded, but I'm getting the following
error in pluto's logs:

ERROR: netlink response for Add SA esp.ff31fffb@<ip obscured> included errno
22: Invalid argument

I presume this is something to do with setkey... Any suggestions on what I'm
doing wrong?

Am using 2.2.0dr3 btw.