sec_error_unknown_issuer

Hi on my website I get the above error - it only happens with firefox - my host installed the certifcates so is it still a problem with missing internediary certifcates (seen the other queries - will read up on it if this is the prioblem) or is it something else?

Website is https://aviationcollectables.co.uk

Yes, it is exactly as you say it is. It’s missing Intermediate Certificates.

I think I have done something wrong as i installed the CA-bundle but it is still showing the error and saying that the certificate is self signed - can you help.

If you’re using the Plesk Control Panel, you need to assign the new certificates to the IP.

no I am using cpanel11 (sorry am not too technical)

Hi,

Follow the instruction from this link to install the CA Bundle certificate on CPanel 11.

https://support.comodo.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=1208