Reports which ESP encryption algorithm this remote-access session's tunnel is actually using, chosen from the negotiated set, including options like the very weak espDES or even espNULL, meaning no encryption. This is a direct security-posture check per session; a live session negotiating down to espDES or espNULL indicates either a misconfigured allowed-algorithms list or a legacy client forcing a weak cipher, a very different finding than a session correctly running strong 3DES or better. Example: finding one active session's raTunnelEncAlgorithm reporting espNULL(9), meaning that session is carrying VPN traffic completely unencrypted, is the kind of finding that demands immediate remediation of that client's allowed cipher list.