I have an Ipsec tunnel between a Barracuda on Site A, and a Sonicwall on Site B. The tunnel is working fine for hours, but about twice a day, it stops working. On Site A, the packages go out like they should, but on Site B, I see that the packages are dropped with the following message:
Text
DROPPED, Drop Code: 441(Octeon Decrypyion Failed Selector check), Module Id: 20(ipSec), (Ref.Id: _775_krugeQevgqpKprwv) 1:1)
When I restart the tunnel on Site A, it’s working again.
A knowledgebase article by Sonicwall suggests that “diasable IPsec Anti-Replay” should be checked, but that’s already the case.