ASA failed anti-replay checking

[ipsec]

What does this error mean?

:%ASA-vpn-4-402119: IPSEC: Received an ESP packet (SPI= 0xBF529470, sequence number= 0xB96D) from 175.232.23.16 (user= user1) to 209.175.12.24 that failed anti-replay checking.

[foxbot]

This message is displayed when an IPsec packet is received with an invalid sequence number. This is more than likely due to the peer sending packets containing sequence number that may have been previously used or sending them out of order due to packet loss on the client’s end. You can increase the anti-reply window with the command: crypto IPsec security-association replay window-size 1024. This command should help with clients with poor internet connections.

[ipsec]

Thanks. I will try this command and will see if it stops this error.

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