SSL Basics

Can I Use One SSL Certificate on Multiple Domains?

We get asked the following question a lot in this industry: “Can I use one SSL certificate on multiple domains?” No matter what language you speak, no matter what industry you work in, the answer is still the same: Yes, you can use one SSL certificate for multiple domains on the same server.


Do I Need an SSL Certificate? The Pros Weigh In

Do I need an SSL certificate? Yes, if you have a website, it needs an SSL certificate. Every website needs an SSL certificate. Back in Summer 2018, Google decided that HTTPS was the way to go and HTTP was no longer acceptable. That means that as of last July, every website that doesn’t have a valid SSL certificate installed gets an ugly little “Not Secure” indicator to the left of the address bar.


How to Install Comodo SSL in GoDaddy

Comodo CA, powered by Sectigo, is a big certificate authority. GoDaddy is a big hosting and web solutions provider. Chances are, if you’re reading an article on how to install a Comodo SSL certificate on GoDaddy, you’re already familiar with both entities. So, without further ado, here's how to install a Comodo SSL certificate on GoDaddy.


What is a Wildcard SAN Certificate and How Does It Work?

The most versatile SSL/TLS certificate available today is the multi-domain wildcard, or what’s known as a wildcard SAN certificate. Not only does it give you the flexibility to encrypt multiple domains — up to a total of 2,000 domains per certificate — but it can also secure any associated first-level sub-domains.


Changing SSL Certificate Provider – How Does It Work?

There are various instances in which you may want to change SSL certificate or change SSL certificate providers.


How Much Does an SSL Certificate Cost?

Choosing the correct SSL (Secure Socket Layer) certificate is crucial for all website owners — whether you own a blog or an eCommerce platform. 


How to Generate a CSR on Node.js

Node.js is a free open-source server environment that runs Javascript on the server. It works on various operating systems such as Windows, Linux, Unix, OS X, etc. and is commonly used for developing server-side web applications.


How to Get SSL Certificate for Website

Do you want to get SSL certificate for website? Are you wondering “how to get SSL certificate for website?”

Well, you’ve come to the right place.

Purchasing an SSL certificate is fairly simple if you know where to look. The entire process can be summed up in a few simple steps.




There is a problem’s with the Certificate Authority that issued the SSL certificate

If you’re here, it’s likely you arrived at a website using Google Chrome and received an error about a Certificate Authority being invalid. This is an issue that needs to be fixed by the website owner or manager. It’s a potentially serious issue that shouldn’t be ignored or bypassed.




A transparency required error means the website’s SSL certificate was not properly logged when it was issued

Certificate Transparency is now a requirement for all trusted Certificate Authorities. What that means is that whenever an SSL certificate is issued, the CA must add it to a Certificate Transparency log (usually several). These logs act as an industry safeguard against mis-issuance.




A weak signature algorithm error is triggered by an SSL issue on the server and can only be fixed by the website owner or manager

If you’re here it’s probably because you’ve received a NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM error while using Google Chrome to visit a website. Unfortunately, this “your connection is not private” error is not something that a user can fix, the problem is the website’s SSL certificate.


How To Fix NET::ERR_CERT_REVOKED Error in Google Chrome

Privacy error ERR_CERT_REVOKED

ERR_CERT_REVOKED is a serious server-side error, and should not be ignored or bypassed


How To Fix NET::ERR_CERT_DATE_INVALID Error On Google Chrome


There are several potential fixes for sites encountering an ERR_CERT_DATE_INVALID error in Chrome

The NET::ERR_CERT_DATE_INVALID error in the Google Chrome browser is a form of the “Your Connection is not private” error. If you’re seeing this error, it means that there’s a difference between your computer’s time and the validity of the website’s SSL certificate:


How To Fix err_ssl_protocol_error On A WordPress Site

wordpress err ssl protocol error

Some common solutions to fixing err_ssl_protocol_error on WordPress

When it comes to SSL-related problems the err_ssl_protocol_error is probably the king. From the user side there are plenty of different things that could be causing the ssl connection error message. Everything from the system time on your computer to your caching.


Comodo Encryption For Emails, Documents, & Websites

Comodo CA is the world leader in encryption solutions.

Comodo CA offers a range of encryption options for all use cases. Encryption has never been more important than it is right now. The world has never been more focused on its privacy and good data security is a big part of that.


Code Signing Certificate vs SSL Certificate: What’s The Difference?

SSL and HTTPS enables the Secure Address Bar

What each certificate type does and who should be using them

Code Signing Certificates and SSL Certificates are both digital certificates that use public key encryption, but that’s about where the similarities end. The underlying technical difference between a code signing certificate and a ssl certificate is small, but they’re security solutions for very different purposes.

Let’s look at the difference between Comodo Code Signing Certificates and Comodo SSL Certificates.


51% Of Users Say They Would Leave A Website Marked “Not Secure” Immediately

Not Secure Google Chrome - User Survey

Beginning with version 68 being released in July 2018. Google Chrome will start marking all HTTP webpages as Not Secure, like this:

Google Chrome Not Secure

This change will be live in the Google Chrome release scheduled for July 24th.

Google announced this change in February, so webmasters have known for awhile this was coming – what we haven’t known is how users will react to this change. To get some insight into that question, we ran a Google Consumer Survey of 350 US adults, asking them:


What is HSTS?

HSTS Preload List Submission

HTTP Strict Transport Security is a must-have addition to your SSL certificate

HSTS or HTTP Strict Transport Security is a website security policy sent via HTTP header. It forces a user’s web browser to only make secure connections with a given website. This is important because it eliminates several potential attacks such as cookie hijacking and protocol downgrade attacks.


Can you have multiple SSL certificates for one domain?

You can install multiple SSL certificates on a domain, but first a word of caution

A lot of people want to know whether you can install multiple SSL certificates on a single domain. The answer is yes. And there are plenty of websites that do. But before you try to install multiple SSL certificates on one domain there are some things you should know first.


Do I need a different SSL certificate for WWW and without?

ssl certificate for www and without

Do I need a different SSL certificate for WWW and without versions of my website?

Your Comodo SSL certificate will cover both WWW and non-WWW domains

Many customers ask us whether their SSL certificate covers both the WWW and non-WWW variations of their domain. Yes, it will. All Comodo SSL certificates secure both the WWW and non-WWW variations of your website. You don’t need a separate SSL for www and non www.

Comodo SSL certificates cover both www and non-www versions of your website

Per WWW standards, even though your website may be the deployed as “,” it will also deploy as “” Many people mistakenly categorize the WWW as a separate sub-domain. It’s actually an alias for the non-WWW domain. WWW is a DNS naming structure.

Shop Comodo SSL Certificates

Your SSL certificate will cover both

There is some misinformation out there about this topic. After all, SSL is an encryption-based protocol that will only secure the domain it has been issued for.

That’s incorrect, almost all CAs – including Comodo – secure both WWW and non-WWW variations with a single certificate. When you generate your certificate signing request (CSR) for your WWW website, it will automatically cover the non-WWW variation as well.

So if you generate a certificate for, it will also secure The browser will show the protocol you’re using, HTTPS, at the front of each address, too. You have nothing to worry about.

You can find a selection of Comodo SSL certificates right here:

SSL Certificates for www and without