The desc explicitly states this is the count of encryption errors — failures encountered while trying to encrypt outbound packets. A nonzero and rising value here means outbound VPN traffic is being silently dropped rather than sent, which manifests to users as one-directional connectivity loss over a VPN rather than an obvious 'tunnel down' alert. e.g. cpvErrOut climbing after a Diffie-Hellman group mismatch was introduced by a peer-side configuration change, causing the gateway to fail to encrypt packets for that tunnel.