VPN: IPSec Replay Detected message when using Global VPN Client (GVC).

You may see an IPSec Replay Detected error in the logs under the following conditions:

1. Two identical VPN packets are received by the SonicWall and carry the same Hash Payload.
   • This can occur if packets are lost in transfer and are retransmitted; make sure there is no interference with IPSec ESP (IP Protocol 50) and UDP port 4500.
   • This can occur in cases with Fragmentation Issues. Make sure " Enable Fragmented Packet Handling" is checked on the VPN > Advanced page.
2. You are in a large deployment where many tunnels are concurrently being torn down and recreated with extremely high traffic and CPU usage conditions.(Rare)
   

There are no known problems with current release firmware evident with this log message.