Nexcess Knowledge Base

A Certificate Signing Request (CSR) is a block of encrypted text created on the server that will use an SSL certificate. A Certificate Authority (CA) will use the CSR to create your SSL certificate.

Multi-domain SSL certificates — or Subject Alternative Name (SAN) certificates — allows one IP address to serve multiple domains and subdomains, though all of those domains must have the same owner.

Internet Corporation for Assigned Names and Numbers (ICANN) requires that all domain owners verify their WHOIS information. Update domain details using your OpenSRS account and inform Nexcess staff.

The Comodo UserTrust Subscriber Agreement is a binding legal document detailing your rights and obligations as a user of the Comodo UserTrust logo and services.

Learn how to get email header for different email clients with our step-by-step guide. Retrieve useful information about unwanted emails or failed-to-send emails.

SpamAssassin is an open source application for filtering spam in email and web server applications. It uses heuristics — pattern recognition — to identify spam.

How Nexcess clients in dedicated or cluster environments can configure reverse DNS records from their Nexcess Client Portal.

Learn how Nexcess clients on physical (non-cloud) servers can recreate SSL keys by either using SiteWorx or the command line interface (CLI).

Learn how Nexcess clients on physical (non-cloud) servers can use SiteWorx to install SSL certificates and set up an SSL chain certificate — regarding intermediate and root certificate authorities.

A chain of SSL certificates contains all of the SSL certificates (root, intermediate, and end user) issued by a Certificate Authority (CA) required to verify the subject in the hierarchy of trust.