I have been using IPSEC from IPfire to Sonicwall for 6 months or more now. Rebooted after an update and now I get:
Oct 14 09:30:15 vpn charon: 13[ENC] parsed IKE_SA_INIT response 0 [ N(INVAL_SYN) ]
Oct 14 09:30:15 vpn charon: 13[IKE] received INVALID_SYNTAX notify error
IPSEC is working to other devices: IPFire as well as ClearOS for net to net.
Anyone know what changes or how to fix this error?