OpenVPN Authenticate/Decrypt packet error: packet HMAC authentication



  • Hi all,

    First I want to apologise if this has previously been asked. I have had trouble locating the info required!

    I have one pfSense server with local IP 172.16.0.1
    1 pfSense clients with local IP-s 172.16.1.1
    They are connected together over OpenVPN site-to-site (Shared key, BF-CBC 128 encryption algorithm)
    When i setup connection Open VPN tunel works for couple minuts and then it crashes.

    Looking at server log i see this massage:
    Process: openvpn
    PID: 21576
    Message: Authenticate/Decrypt packet error: packet HMAC authentication failed

    I posted screenshot from server log and client log
    How to resolve thiss error
    Thanks






  • Please…
    Anyone?


  • Rebel Alliance Developer Netgate

    Something between the two does not match. Most likely you didn't copy the shared key from one to the other so they are using different keys.



  • I'm having the same problem… "Authenticate/Decrypt packet error: packet HMAC authentication failed"

    and I've reviewed and re-input the keys a couple of times. I  believe this may be related to the recent reset of all of the PIA keys/ports/ciphers due to the Russian activity.

    Does anyone have a 'how-to' that includes the most recent changes? TIA.


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