A PEM file is a text file containing one or more certificates and, optionally, a private key. (While a CRT file only contains a single certificate.) Below are different ways to create a PEM file, depending on your installation needs.
Did you know that every SSL/TLS certificate is issued with a specific validity period? This period encompasses the certificate’s issuance and expiration dates. So, if you see the SSL/TLS certificate-related error messages “NET_ERR_CERT_DATE_INVALID” or “SEC_ERROR_EXPIRED_CERTIFICATE ” in your browser when using Chrome or Firefox, it typically means the site’s SSL/TLS certificate is being used beyond its validity period and is no longer trustworthy.
In other words, any site using this certificate isn’t secure, and any data transmitted is at risk of compromise by man-in-the-middle (MitM) attacks. Not to mention the business risks and downtime issues your site or services will experience as the result of an expired certificate.
The public key the web browser uses to verify the validity of the SSL/TLS certificate’s signature is incorrect or isn’t pinned to the HTTP header. Key pinning may help you minimize the risk of MITM attacks. However, if you don’t do it right, it can do more harm than good.
Considering that Firefox, Chrome, and other major browsers have eliminated support for HPKP (i.e., HTTP public key pinning), it means that sites shouldn’t be using it.
Did you see (or did someone else inform you) the SSL protocol error ERR_SSL_UNRECOGNIZED_NAME_ALERT or SSL_ERROR_UNRECOGNIZED_NAME_ALERT on your site?
Let’s explore what this HTTPS unrecognized name error means and how to fix it quickly.
As a WordPress website owner, few things are more frustrating than discovering that your website is displaying errors such as ERR_SSL_PROTOCOL_ERROR or SSL_ERROR_UNSUPPORTED_VERSION to prospective customers. Not only is it a bad look as far as your reputation is concerned, but it’s also a great way to drive business and revenue to your competitors.
For website users, seeing these errors is more than just an inconvenience. It also can make you feel less confident in the company that owns the site and its employees’ ability to protect your sensitive data.
The good news is that this error is easy to fix and doesn’t have to be a deal-breaker as far as business is concerned. We’ll explore what these errors are, what they look like, and how you can fix them as a website owner or user.
If you’re seeing the “NET ERR_CERT_WEAK_SIGNATURE_ALGORITHM” error, you’re either a website visitor trying to access a website or a website owner whose site is displaying this error. Either way, it means your data isn’t securely transmitting.
In this post, we’ll talk about both cases and help you resolve this error that says “your connection is not private.” Most of the time, the “NET::ERR_CERT_WEAK_SIGNATURE_ALGORITHM” (or “ERR_CERT_WEAK_SIGNATURE_ALGORITHM”) occurs in Google Chrome because a website has an SSL certificate with an outdated algorithm.
When you see the message “NET::ERR_CERT_REVOKED” (or “NET::ERR_CERT_REVOKED”) message in your browser, it’s never a good look. It means the certificate authority (CA) who issued the certificate revoked it (i.e., canceled it before its expiration date) and added it to the SSL certificate revocation list (CRL). Thus, your website is at risk of breaches, and all data is transmitted without the security of an encrypted connection.
In this post, we’ll give you some straightforward solutions that will help you fix the “NET ERR_CERT_REVOKED” error in Google Chrome. Whether you’re a website owner or a website visitor, we’ve got you covered.
Although they contain the same data, the differences between them lie in the encoding format and traditional usage on different operating systems.
Previously, this required a dedicated IP address for each domain, but since the invention of the Server Name Indication (SNI) technology, it has become possible to manage several certificates on a single IP address.
In this article, we will look into the possible reasons behind this error as well as provide a detailed guide on how to fix it.
Petar N.Feb. 2025
"Excellent platform with a wide selection of solutions suitable just for you here you can find the right certificate just for your purposes and at the best prices. The support is very good. I highly recommend cheapsslsecurity.com to anyone who needs a certificate."
Raed NeshiewatFeb. 2025
"Very fast delivery. Installation was easy with no problems. If you are installing a wildcard SSL certificate on cPanel, you need to specify the actual domain name, don't try to install it on *.domain.com , you have to install it on each subdomain such as admin.domain.com, shop.domain.com,..etc. Use the same certificate for each subdomain you install. Good luck!"
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