Windows 11 Warp Clients unable to connect: CF_DNS_LOOKUP_FAILURE

SSE and Zero trust WARP
1

What is the name of the domain?

warp.zerotrust.com

What is the error number?

Status: Unable to connect Error reason: DNS lookup failure Error code: CF_DNS_LOOKUP_FAILURE

What is the issue you’re encountering

Windows Warp client unable to connect

What steps have you taken to resolve the issue?

Installed client on three different Windows 11 machines, same error message.
Or networks have all outbounds ports allowed.

What are the steps to reproduce the issue?

Install latest Cloudflare Warp client
Connects fine
Login via Cloudflare zero trust account
Connection no longer possible

Screenshot of the error

warp-error.png
warp-error.png378×462 40.4 KB

2

Windows IP Configuration

Host Name . . . . . . . . . . . . : WinDev2407Eval
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Mixed
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : xyz.box

Ethernet adapter Ethernet 2:

Connection-specific DNS Suffix . : xyz.box
Description . . . . . . . . . . . : Microsoft Hyper-V Network Adapter #2
Physical Address. . . . . . . . . : 00-15-5D-02-0A-0A
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::5876:105c:ad9c:c257%15(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.156(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Saturday, May 3, 2025 10:00:14 AM
Lease Expires . . . . . . . . . . : Tuesday, May 13, 2025 10:03:04 AM
Default Gateway . . . . . . . . . : 10.0.0.138
DHCP Server . . . . . . . . . . . : 10.0.0.138
DHCPv6 IAID . . . . . . . . . . . : 251663709
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-2F-A8-6F-61-00-15-5D-00-06-04
DNS Servers . . . . . . . . . . . : 10.0.0.12
NetBIOS over Tcpip. . . . . . . . : Enabled

3

No antivirus running
Windows Defender firewall for testing completely disabled

4

Found it, should be really better documented:

a default DNS location needs to be setup in Cloudflare Zero:

Gateway > DNS Locations` , create a new location, and choose to set it as the default

5

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