I customer of us have a lot of branch offices that all connect though VPN Tunnel with on both side a Cisco router. Except voor 2 branch offices the have a fortigate firewall the connection have worked before but the last 3 weeks the connection won't get up. And get following message when I use the debug command: debug crypto isakmp error and debug crypot ipsec
168981: May 15 09:53:13.113 CETDST: ISAKMP:(2289):deleting SA reason "Fail to allocate ip address" state (R) CONF_ADDR (peer <IP OTHER SIDE)
168982: May 15 09:53:13.113 CETDST: ISAKMP (0:2289): FSM action returned error: 2
Can anyone tell me what the error message mean and how I can fix it.