PCI Compliance failed UDP port 500

Here’s another fail for the updated PCI scan:

  1. SSL Certificate is Not
    Trusted (External Scan)
    Port: tcp/32015
    It was not possible to validate the SSL certificate, and thus it could not
    be trusted. Users may receive a security warning when using this
    service. This occurs because either the certificate or a certificate in its
    chain has issues that prevent validation. Some examples of these
    issues are, but not limited to, a certificate having expired, the
    hostname does not have match the name on the certificate, or the
    certificate is not signed by a well-known Certificate Authority (CA).
    CVSSv2: AV:N/AC:M/Au:N/C:P/I:P/A:P
    Service: generic_ssl
    Evidence:
    Subject: /OU=Domain Control Validated/OU=PositiveSSL/CN=captiveportal.
    peplink.com
    Issuer: /C=GB/ST=Greater Manchester/L=Salford/O=COMODO CA
    Limited/CN=COMODO RSA Domain Validation Secure Server CA
    Certificate Chain Depth: 0
    Reason: The hostname on the certificate does not match any of the
    hostnames provided to the scanner.

The issue I have here is that I have captive portal disabled on this device, so how the external scan is even picking up the captiveportal.peplink.com is confusing to me. Can anyone help me understand how this would be happening?