# IPSEC to Sonicwall stopped working

**URL:** <https://community.ipfire.org/t/ipsec-to-sonicwall-stopped-working/3449>\
**Category:** IPsec\
**Created:** [14 October 2020 14:33 UTC](https://community.ipfire.org/t/ipsec-to-sonicwall-stopped-working/3449 "2020-10-14T14:33:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dfwtx](https://community.ipfire.org/user_avatar/community.ipfire.org/dfwtx/32/240_2.png) [@dfwtx](https://community.ipfire.org/u/dfwtx)\
**Post date:** [14 October 2020 14:33 UTC](https://community.ipfire.org/t/ipsec-to-sonicwall-stopped-working/3449/1 "2020-10-14T14:33:33Z")

</div>

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?