Users cannot log in to a Cisco ASA using clientless SSLVPN. Troubleshooting reveals the error message "WebVPN session terminated: Client type not supported". Which step does the administrator take…

The AnyConnect premium license enables full-tunnel client-based access; clientless browser-based SSLVPN does not require this license and enabling it would not resolve a protocol-not-permitted error.

Browser compatibility issues produce different error messages related to SSL/TLS negotiation or unsupported ciphers, not a 'client type not supported' termination tied to group policy protocol settings.

The simultaneous logins setting limits how many concurrent sessions a user may have open; it does not determine which VPN protocols are permitted and would produce a different session-limit error if exceeded.

Cisco ASA group policies control which VPN protocols are permitted for users in that group; if the clientless SSL protocol is not listed as an allowed protocol in the group policy, the ASA terminates the session with this error even though WebVPN is globally enabled. Enabling the clientless VPN protocol within the specific group policy grants users in that group permission to connect via a browser without the AnyConnect client.