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Newer versions of Cisco's Anењњonnect clients and servers support DTLS 1.2 in its standardized on-the-wire form ( RFC 6347), though they continue to use a non-standard mechanism (based on session resumption) for DTLS key exchange. Because of this, it was difficult to make OpenConnect implement a Cisco-compatible version of DTLS without linking against OpenSSL.Д®xplicit support for Cisco's non-standard version of DTLS was included in OpenSSL 0.9.8m (where it is known as DTLS1_BAD_VER) and then GnuTLS 3.2.1 (where it is known as GNUTLS_DTLS0_9). DTLS Д¬isco's proprietary Anењњonnect clients and servers were originally built against a patched, 2007 release of OpenSSL 0.9.8f, which implemented a pre-release version of DTLS that was not compatible with DTLS 1.0 as standardized in RFC 4347. OpenConnect's implementation of the Anењњonnect protocol is sufficiently complete that some of Cisco's own IP phone devices embed a very old release of OpenConnect (rather than Cisco's own proprietary software) in order to be able to connect to Cisco SSL VPNs. The DTLS protocol used by Cisco Anењњonnect servers was based on a non-standard, pre-release draft of DTLS 1.0, until support for the DTLS 1.2 standard was added in 2018. Protocols Cisco Anењњonnect Д¬isco Anењњonnect VPNs utilize TLS to authenticate and configure routing, then DTLS to efficiently encrypt and transport the tunneled VPN traffic, and can fall back to TLS-based transport where firewalls block UDP-based traffic. Both OpenConnect and ocserv strive to maintain backwards-compatibility with Cisco Anењњonnect servers and clients. OpenConnect and ocserv now implement an extended version of the Anењњonnect VPN protocol, which has been proposed as an Internet Standard.

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As of 2013, the OpenConnect project also offers an Anењњonnect-compatible server, ocserv, and thus offers a full client-server VPN solution.

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