Please upgrade your AnyConnect Client Failed to complete authentication

[crazyn2]

openconnect bar
============================================
SSH Port: 2222 (customize with SSH_PORT)
SOCKS Proxy Port: 1080 (customize with SOCKS_PORT)
HTTP Proxy Port: 1088 (customize with HTTP_PROXY_PORT)
Use: ssh bar
============================================
Populating /root/.ssh/authorized_keys with the value from AUTHORIZED_KEYS env variable ...
Generating new host keys as necessary...
ssh-keygen: generating new host keys: RSA ECDSA ED25519 
Starting supervisor...
POST https://vpn.emmu.edu.cn/
Connected to 220.166.107.139:443
SSL negotiation with vpn.emmu.edu.cn
Connected to HTTPS on vpn.emmu.edu.cn with ciphersuite TLSv1.2-ECDHE-RSA-AES256-GCM-SHA384
Got HTTP response: HTTP/1.1 404 Not Found
GET https://vpn.emmu.edu.cn
Unexpected 404 result from server
Connected to 220.166.107.139:443
SSL negotiation with vpn.emmu.edu.cn
Connected to HTTPS onvpn.emmu.edu.cn with ciphersuite TLSv1.2-ECDHE-RSA-AES256-GCM-SHA384
Got HTTP response: HTTP/1.0 302 Object Moved
GET https://vpn.emmu.edu.cn/+webvpn+/index.html
SSL negotiation with vpn.emmu.edu.cn
Connected to HTTPS on vpn.emmu.edu.cn with ciphersuite TLSv1.2-ECDHE-RSA-AES256-GCM-SHA384
Got HTTP response: HTTP/1.1 301 Moved Permanently
GET https://vpn.emmu.edu.cn/+CSCOU+/anyconnect_unsupported_version.html
Please upgrade your AnyConnect Client
Failed to complete authentication

请问下，这个是什么情况