There is an issue with the TLS configuration for cloud.cambiumnetworks.com. The servers are not serving up the "COMODO RSA Domain Validation Secure Server CA" intermediate certificate. It is only serving the end-issued wildcard cert for cloud.cambiumnetworks.com.
Is applies to:
Clients that don't have this intermediate in their trusted intermediate certificate store receive a TLS error. I noticed it on my Android phone. My Windows PC is fine as the cert is in my store (for whatever reason).
Please see the attached Wireshark screenshot.
Also see the SSL Labs report:
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- cloudCN.png (42.8 KB)