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I have a Draytek Vigor 2862 that I am trying to configure SSL on. I have imported the Comodo Cert in as a Local Certificate, added the intermediate certificates as trusted certificates and then access the router over HTTPS and all looks ok in Firefox.

The problem comes when I look at SSLLabs.com and get a "Chain Issues" error capping the score as a B. It looks as though only the signed certificate is being downloaded and the intermediate certificate is not.

I have tried chaining the 2 together, but the router doesn't like that and throws errors about the file format.

I am running the latest firmware (3.8.9.2_BT). The releases notes say that the firmware should now support longer certificates / chains.

  • This reminds me of a different product that if you didn’t either reboot (or enter a hidden system cli command) would not activate the certificate change. You may also find some devices are very very fussy/flimsy around certificates, such as requiring the certificate chain to be built from the root first. Lots of potential for pain here. Suggest you show exactly what you installed. (certificates are essentially public data anyway) – Cameron Kerr Nov 22 '18 at 8:50

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