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Cisco Bug: CSCvh75689 - OSX: DNS times out with tunnel-all VPN and Umbrella resolvers unreachable

Last Modified

Aug 06, 2019

Products (1)

  • Cisco AnyConnect Secure Mobility Client

Known Affected Releases

4.5(3040) 4.5(4029)

Description (partial)

Unable to browse the webpages when connected to a full tunnel group as the DNS requests are going to open DNS servers(not reachable via tunnel) instead of DNS servers configured on the tunnel

1.Install Anyconnect VPN +  Umbrella
2.Connect to headend on blizzard/blizzard-legacy networks[headend is configured as Tunnel All ipv4 traffic and drop ipv6 traffic]
3.Umbrella protected state is Disabled due to VPN(Expected)
4. When we ping  or browse websites(, where opendns resolvers are not reachable(inside the tunnel), the DNS queries are going directly from client to opendnsservers(Unexpected) instead of dns servers configured on the headend
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