Una VPN Ipsec si disconnette regolarmente

• Mettere in debug la configurazione:

sudoedit /etc/default/racoon 

RACOON_ARGS="-d -d"

• Riavviare tutto

sudo /etc/init.d/setkey restart
sudo /etc/init.d/racoon restart

• Verificare tutti gli errori che appaiono:

sudo tail -f /var/log/syslog | grep 'racoon: ERROR'

May 25 12:46:57 fireuf racoon: ERROR: pfs group mismatched: my:2 peer:0
May 25 12:46:57 fireuf racoon: ERROR: not matched 
May 25 12:46:57 fireuf racoon: ERROR: no suitable policy found.
May 25 12:46:57 fireuf racoon: ERROR: failed to pre-process packet.

• In questo caso, cancellare la riga:

sudoedit /etc/racoon/galtriv.conf 

pfs_group 2;

• Riavviare tutto

sudo /etc/init.d/setkey restart
sudo /etc/init.d/racoon restart

Riferimenti

IPSec w/ RHEL4 - Racoon error messages - Linux Forums