Add origin server errors and list necessary root CA files

Author: RebeccaTamachiro

src/content/docs/ssl/origin-configuration/origin-ca/troubleshooting.mdx

@@ -16,9 +16,30 @@ Consider the following common issues and troubleshooting steps when using [Cloud
 ### Cause
 <Render file="origin-ca-pause-error" />
 
-This also means that SSL Labs or any other SSL validator are also expected to flag the certificate as invalid.
+This also means that SSL Labs or similar SSL validators are expected to flag the certificate as invalid.
 
 ### Solutions
 
 - Make sure the [proxy status](/dns/manage-dns-records/reference/proxied-dns-records/) of your DNS records and any [page rules](/rules/page-rules/) (if existing) are set up correctly. If so, you can try turning proxy off and then on again and wait a few minutes.
-- If you must have direct connections between clients and your origin server, consider installing a publicly trusted certificate at your origin instead. This process is done outside of Cloudflare, where you should issue the certificate directly from a <GlossaryTooltip term="Certificate Authority (CA)">certificate authority (CA)</GlossaryTooltip> of your choice. You can still use Full (strict) [encryption mode](/ssl/origin-configuration/ssl-modes/), as long as the CA is listed on the [Cloudflare trust store](https://github.com/cloudflare/cfssl_trust).
+- If you must have direct connections between clients and your origin server, consider installing a publicly trusted certificate at your origin instead. This process is done outside of Cloudflare, where you should issue the certificate directly from a <GlossaryTooltip term="Certificate Authority (CA)">certificate authority (CA)</GlossaryTooltip> of your choice. You can still use Full (strict) [encryption mode](/ssl/origin-configuration/ssl-modes/), as long as the CA is listed on the [Cloudflare trust store](https://github.com/cloudflare/cfssl_trust).
+
+## The issuer of this certificate could not be found
+
+### Cause
+Some origin web servers require that you upload the Cloudflare origin CA root certificate or certificate chain.
+
+### Solution
+Use the following links to download either an ECC or an RSA version and upload to your origin web server:
+
+* [Cloudflare Origin ECC PEM](/ssl/static/origin_ca_ecc_root.pem) (do not use with Apache cPanel)
+* [Cloudflare Origin RSA PEM](/ssl/static/origin_ca_rsa_root.pem)
+
+## The certificate is not trusted in all web browsers
+
+### Cause
+Apache cPanel requires that you upload the Cloudflare origin CA root certificate or certificate chain.
+
+### Solution
+Use the following link to download an RSA version of the root certificate and upload it to your origin web server:
+
+* [Cloudflare Origin RSA PEM](/ssl/static/origin_ca_rsa_root.pem)