D is correct.
https://www.cisco.com/c/en/us/support/docs/routers/sd-wan/214509-troubleshoot-control-connections.html
DTLS Connection Failure (DCONFAIL)
This is one of the common issues of control connectivity that does not come up. Probable causes include a firewall or some other connectivity issues.
D
DTLS Connection Failure (DCONFAIL)
This is one of the common issues of control connectivity that does not come up. Probable causes include firewall or some other connectivity issues.
https://www.cisco.com/c/en/us/support/docs/routers/sd-wan/214509-troubleshoot-control-connections.html
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