Github user swill commented on the issue:
https://github.com/apache/cloudstack/pull/872
**Update:** I found this article:
https://lists.strongswan.org/pipermail/users/2014-October/006871.html
**In the file `/etc/ipsec.d/l2tp.conf` I added the option `type=transport`
to the `conn L2TP-PSK` section and now I have `Remote Access VPN` working!
Woohoo!!!**
I have also change a few other things, but they may not be required, but
seem to be correct according to the strongswan docs I have been reading.
Removed `charonstart=yes` and `plutostart=yes` from `config setup` in
`/etc/ipsec.conf` as per:
https://wiki.strongswan.org/projects/strongswan/wiki/CharonPlutoIKEv1
Removed `pfs=no` from `conn L2TP-PSK` in `/etc/ipsec.d/l2tp.conf` as per:
https://wiki.strongswan.org/projects/strongswan/wiki/CharonPlutoIKEv1
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