We have to be honest, logs are often an after thought to most developers. Many logs are pretty cryptic unless you can look at the code and see what is going on. In this section, we will share what we think of a specific log: - the cryptic ones, the fun ones and some of the ones we see more often.
Mar 11 16:11:30 vpnproxy charon: 11[ENC] header verification failed
For: Router (Unifi and others) VPN server
Meaning: This error happens when the client settings are not correct for the VPN gateway or mismatched IKE settings.
What to do: Correct VPN settings.