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Cisco Bug: CSCvs68805 - VPN tunnel cannot connect on Windows with ECDH group 21 and only TLS 1.2 enabled on gateway

Last Modified

Apr 10, 2020

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases

4.7(136)

Description (partial)

Symptom:
SSL VPN connection fails with error (prior to authentication): Could not connect to server. Please verify Internet connectivity and server address.
IPsec VPN connection fails with error (post-authentication): The VPN client failed to establish a connection.

Conditions:
- Platform: Windows 7, 8, 10.
- VPN head end configured to only support client SSL connections using at least TLS v1.2.
- Elliptical Curve Diffie-Hellman Group 21 is configured on the head end.
- AnyConnect and the head end negotiate an Elliptic Curve Diffie-Hellman Ephemeral (ECDHE) cipher suite during the initial TLS v1.2 handshake.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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