Authenticate/Decrypt packet error: packet HMAC authentication failed

[Tim Lunn]

Since upgrading to groovy my openvpn connection out to our corporate is not working.

I was testing Iwd but have now reverted to wpa_supplicant.

Connection to the vpn succeeds and routing table gets setup, however no traffic is flowing over the connection and I get the following errors

nm-openvpn[4428]: Authenticate/Decrypt packet error: packet HMAC authentication failed

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: network-manager-openvpn 1.8.12-2
ProcVersionSignature: Ubuntu 5.8.0-18.19-generic 5.8.4
Uname: Linux 5.8.0-18-generic x86_64
ApportVersion: 2.20.11-0ubuntu45
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: GNOME
Date: Thu Sep 10 15:06:03 2020
InstallationDate: Installed on 2020-07-23 (48 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: network-manager-openvpn
UpgradeStatus: Upgraded to groovy on 2020-08-31 (10 days ago)

[Tim Lunn (darkxst)]

OK after digging further through the logs, it seems that at some point NetworkManager lost the vpn "HMAC Authentication" Cipher setting.

not sure if this was caused during the Dist upgrade or switching to IWD. I will report further on this once I upgrade second laptop to Groovy.