When connecting to various online services, your Mac will use certificates to validate a connection. If a certificate being used for a connection is expired or invalid, then OS X will notify you of this when attempting to use it, and offer you the choice of continuing with the connection, inspecting the certificate, or canceling the connection. Such warnings are convenient for detecting an invalid connection, such as one that might be malicious, so if they happen then consider looking into them; however, there may be times when practically every connection you attempt gives you a certificate warning.

Oct 28, 2019  For older OS’s that you can now download directly from the web (Sierra, El Capitan, Yosemite), open the.dmg and run the.pkg inside. The Installer window has a padlock in the top right corner you can click to see the certificate details. To do this with an “Install macOS?app” installer downloaded through the App Store, you have to right-click it, Show Package Contents, go to Contents. Oct 24, 2019  Mac Pro introduced in early 2008 or later Xserve models introduced in early 2009. To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu. If your Mac isn't compatible with OS X El Capitan, the installer will let you know. Feb 25, 2020  I cannot clean install MAC OSX 10.11 on my 2009 Mac Book Pro. I need to repurpose this older MBP for someone else here. I have tried a few different ways as listed below: Installed starting from 10.6 and kept installing each subsequent system until I reached 10.10 but when I tried 10.11 no. Sep 10, 2015  When connecting to various online services, your Mac will use certificates to validate a connection. If a certificate being used for a connection is expired or invalid, then OS X will notify you of this when attempting to use it, and offer you the choice of continuing with the connection, inspecting the certificate, or canceling the connection.

When this happens, it suggests a problem with your certificate configuration, more than a problem with the connections at hand, and this may happen for several reasons, which can usually be fixed by one of the following approaches:

Certificate authentication requires your Mac’s time be in sync with the server you are connecting to, so if for some reason your Mac’s time is off, then you may get these errors. To fix this, go to the Date & Time system preferences, and ensure the option to “Set date and time automatically” is checked (click the lock to authenticate if this option is grayed out). Be sure the time server used is one that is appropriate for your location, and then close the system preferences. Within a few moments, OS X should adjust your system clock, which should clear the certificate errors.

Whenever you have certificate and authentication errors, be sure your system’s clock is accurate. You can ensure this is always the case by using a dedicated time server for your system.

2. Change trust settings for specific certificates

If this is happening only for specific certificates, and you trust that the service you are connecting to, then you can modify the trust settings for the certificate to allow the authentication to proceed. To do this, open the Keychain Access utility (in the Applications > Utilities folder), and select your login keychain. In here, click the Certificates category, and then locate the certificate for the service you are connecting to. You can do this by searching for the domain name of the service, or by sorting the certificates by name and scrolling through them.

If a certificate has a red “X” symbol on its icon, then this means the certificate has expired or is otherwise invalid. In these cases, you can right-click the certificate and remove it from your system. If the connection requires one, then it will be downloaded from the service again the next time you connect and authenticate.

Start by choosing this option to remove custom trust settings for your certificate, but also consider adjusting specific trust settings that pertain to your connection.

If the certificate has a blue plus symbol, then this indicates custom trust settings for the certificate, which may be the reason for the faults you are experiencing. For instance, a certificate may be used for SSL validation, but if this trust setting is not set up properly, then OS X will prompt you to use this certificate every time an SSL connection attempts to use it. Fixing this requires adjustment of the trust settings for the certificate:

1. Double-click the certificate in Keychain Access to open it
2. Expand the “Trust” settings section
3. Choose “Use System Defaults” from the top-most menu

The system defaults setting should have the certificate used for the appropriate connections on demand; however, you can also attempt to manually adjust the custom trust settings for the certificate. For instance, if you get this certificate error only when using a Kerberos single sign-on password, you might choose “Always Trust” for the Kerberos Client trust setting. You can try similar options for the other trust settings, but only enable those that the certificate is specifically used for.

3. Reset your keychain

Finally, you can take steps to reset your Mac’s keychain certificates. While you should not need to clear your entire keychain and set it up from scratch again, you can select and remove the certificates that are mentioned by these errors. Doing so will have the system re-download new certificates for connections that demand them, potentially overcome configuration errors in the prior certificates. Note that you should only do this for your account’s login keychain. There is a special keychain called “System Roots” that contains a number of certificates. These are public certificates issued by numerous trusted certification authorities, and are used to validate certificates issued by online services to which you connect. Removing or modifying these will break your ability to validate connections, so it is best to leave these alone.

The following instructions will guide you through the CSR generation process on Mac OS X El Capitan (v.10.11). To learn more about CSRs and the importance of your private key, reference our Overview of Certificate Signing Request article. If you already generated the CSR and received your trusted SSL certificate, reference our SSL Installation Instructions and disregard the steps below.

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1. Launch the Mac OS X El Capitan (v.10.11) Server App.

2. Navigate to the server settings

From the Finder window, under Favorites, select Applications and then Server.

3. Determine where Certificate will be installed

From the Server App window, under Choose a Mac, select one of the following options to determine where to create the CSR and install the SSL certificate once issued.

• To make a CSR on the current server:
  • Click This Mac – YourServerName and click Continue.
  • Enter the Administrator Name and Password and click Allow.
• To make a CSR on another server:
• • Click Other Mac – YourOtherServerName and click Continue.

4. Enter your Host Name and IP Address.

5. Enter the Administrator Name and Password and click Allow.

6. From the Server App window, under Server, click Certificates.

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7. In the Certificates page, click + (at the bottom) and select Get a Trusted Certificate…

8. Click Next on the Get a Trusted Certificate page.

8. Enter CSR Details

Enter your CSR details and click Next.

Note:To avoid common mistakes when filling out your CSR details, reference our Overview of Certificate Signing Request article.

9. Click Save and then Finish.

Note: Make sure you remember the filename and file path where the CSR was saved.

10. Generate the order

Locate and open the newly created CSR from the specified location you choose in a text editor such as Notepad and copy all the text including:

Return to the Generation Form on our website and paste the entire CSR into the blank text box and continue with completing the generation process.

Upon generating your CSR, your order will enter the validation process with the issuing Certificate Authority (CA) and require the certificate requester to complete some form of validation depending on the certificate purchased. For information regarding the different levels of the validation process and how to satisfy the industry requirements, reference our validation articles.

After you complete the validation process and receive the trusted SSL Certificate from the issuing Certificate Authority (CA), proceed with the next step using our SSL Installation Instructions for Mac OS X El Capitan (v.10.11).