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Sometimes, the SSL Certificate which was issued to you does not match the Private Key which you are trying to use when installing that SSL Certificate on your server. That is a common user generated error.
If the system says there is a mismatch, then you need to double check the CSR and Private Key which you generated, and which came together. You need to make sure that you used that specific CSR when you configured your SSL Certificate. When the SSL Certificate is issued, you need to use the Private Key that pairs with that specific CSR.
We see customers making the mistake where they generate one CSR and Private Key, then configure the SSL Certificate with a different CSR that is server generated. In that case the server generated CSR pairs with its own Private Key which you most probably don’t have.
The Private Key which you have works only with the CSR that it came with. Also, the Private Key which you have works only with the SSL Certificate that was configured using the CSR that pairs with that Private Key.
Solution
To solve this, you need to re-configure (re-issue) your SSL Certificate using a CSR code for which you have the Private Key that it pairs with. You may want to use a CSR code that your server provides, or generate a new CSR and Private Key.
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An SSL Certificate takes the information that your users provide and encrypts it, so that only a web server can decrypt it and understand it. So as the information on the web is transmitted via HTTP language, your data is not protected, as HTTP itself is not secure. The SSL Certificate takes your information, encrypts it, and passes it securely to the server where the website is hosted, or directly to the payment processor. On the merchant’s server, or on the payment processor’s side, the SSL certificate receives the encrypted HTTP information, decodes it, and safely performs the action you requested (logging you in, processing a payment, etc).
In this way, the SSL Certificate turns your “HTTP” connection into an “HTTPS” (secured HTTP) connection and protects your data. With an SSL Certificate, your information is protected and safe.
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The validation time of an SSL depends on the type of certificate you chose to buy.
Domain Validated certificates are issued within 3-5 minutes in 99% of the cases. Only when an SSL Certificate is requested for a domain name that contains a trademark or a brand name, then those SSL Certificates may pass brand validation, and can take up to a business day to be issued.
Business Validated certificates are usually issued within 1-3 business days.
Extended Validated certificates can take between 1-7 business days to be issued. The Certificate Authority does its part of the work very quickly. If all the information is provided to the Certificate Authority quickly and correctly, then the Certificate Authority can issue the EV certificate within 1 business day. We’ve seen situations when the EV Certificate was issued within a few hours. The 1-7 days period depends on how quickly the customer provides the required information to the Certificate Authority, and how quickly the customer responds to the Certificate Authority’s potential requests for additional information.
By doing the Validation process, the Certificate Authority’s is trying to confirm that you are the owner of the domain, and that the company that you are requesting a Business Validation or Extended Validation certificate for is active. That is why it is important that you keep your company’s records (address and phone number) up to date and you promptly respond to the Certificate Authority’s requests.
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Here are the requirements for obtaining an Extended Validation (EV) code signing certificate from Sectigo/Comodo:
For an in-depth explanation of each step, consult our guide on Extended Validation for Sectigo/Comodo certificates.
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A CSR is generated immediately. It will be generated to you as soon as you fill in the CSR Generator form.
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Yes, you can look what information your CSR includes, by doing a process which is opposite to encrypting it. You can use our CSR Decoder tool in order to see what information is included in your CSR. You can do that our CSR Decoder page.
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To export a S/MIME certificate from firefox follow the instructions below:







Source: Sectigo’s Knowledge Base
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Follow the steps below to export your CPAC (which was already installed on Keychain into a PKCS12 file).




Once you’ve exported the Email;/Personal Authentication certificate into P12 format, you can import it into a MAC OC using Keychain Access. To complete the process, follow the steps below:

Note: If prompted to trust certificates issued by your CA automatically, select the Always Trust option to trust and install your certificate.
Source: Sectigo’s Knowledge Base
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You can install your Sectigo CPAC Certificate as soon as it has been issued to you.
Here are installation instructions for different browsers, email clients, and mobile devices provided by Sectigo:
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Different SSL Certificate brands have different Extended Validation procedures. Please read the section that applies to your SSL Certificate brand below.
DigiCert (including Thawte & GeoTrust)
The validation team would send you an agreement by email, during the verification process. Then the certificate authority will work on validating the legal existence of your company via local public databases, as a part of the Extended Validation process. This may take between 1-3 working days. Please wait until one of the certificate authority representatives contacts you about any additional information that they may need you to provide them.

Sectigo/GoGetSSL
Please send the necessary forms described below to Sectigo by opening a ticket with Sectigo Validation Center at https://sectigo.com/support. Click on “Submit a ticket”, select Validation Department, and submit your request. Please mention your “Partner Order ID” in your message.

I. New Orders
STEP 1: Agreement signing
In a few hours after the order is placed, you will receive an email from Sectigo with a click-through link called the “Validation Manager link“.
Please use this click-through link to access the Validation form and sign the agreement using a digital signature and upload it directly to Sectigo.
If you didn’t receive the email with the link and/or can’t sign the agreement digitally, please fill these 2 forms – Certificate Request Form and EV SSL Subscriber Agreement – and send them to Sectigo (see above instructions).
You can also download the Sectigo EV forms from their knowledge-base.
STEP 2: Business Validation
To pass Business validation, you may have to provide an official registration document, such as Business License, Article of Incorporation, and or Registration application.
Here are the BV options:
A. No paperwork. Your company’s legal existence will be checked via public government database using your company name and your unique Registration/Identification number OR via verified public 3rd party databases, such as GLEIF, Duns & Bradstreet, Hoovers, Companies House GOV.UK.
B. Paperwork. Your company will be verified using:
STEP 3: Callback process
The last step is a callback process called Phone Validation. Sectigo will call you and asks to confirm your name and order to validate the official company’s phone number.
Below are the 4 callback options. You don’t have to do all four things from below. Doing just one of them will be enough.
A. Yellow Pages Databases. Sectigo verifies your phone number via public Yellow pages Databases.
B. DUNS. The second way is to provide your DUNS number to Sectigo. You can get your company’s DUNS number from this website: https://www.dandb.com/. If Sectigo gets back to you and says that your DUNS listing does not contain a phone number, then you need to contact Dun & Bradstreet (at https://www.dandb.com/) and ask them to “add your company’s phone number to their business directory and on the report”.
C. Local phone database. If you don’t have a DUNS number, then the other thing you can do is to provide your company’s registration number for Sectigo to check your company with your country’s governmental directories (e.g.: Corporation Division, Companies House, Department of State, etc). Please note that Sectigo will be looking to see your company’s phone number listed there as well. Not all governmental directories have the companies’ phone numbers. If the governmental directory allows you to call them, email them, or use their website to add your phone number, then please go ahead and do that.
D. Legal Opinion. If the above two options (2.1 and 2.2) don’t work for you, then the third and last option to validate your phone number is to ask a CPA (Certified Public Accountant), or a Latin Notary, or an Attorney (Lawyer) to write, sign and send a letter to Sectigo where they confirm your company name, address and phone number. You can find the sample letters below:
– Sample Accountant Letter
– Sample Legal Opinion Letter
II. Renewal/Reissue Orders
For reissues and renewal order, instead of Step 1 and 2, you must contact Sectigo Validation Center at https://sectigo.com/support. Click on “Submit a ticket”, or choose Live Chat, select Validation Department and submit the following request (please replace [] fields with the corresponding info):
Reason for the ticket: Validation
Order number: [Your Partner Order ID]
Subject: Extended Validation
Dear Sectigo!
Please validate order [Partner Order ID] using the company name [Your Company Name], with [Registration/ID number] and [DUNS number].
Sectigo will then contact you for Step 3 or any updates of Step 1 or 2 described above.
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