troubleshooting: “UNTRUSTED_CERT_TITLE” Error Message on macOS

The Macintosh operating system, also known as macOS, is the official operating system developed by Apple for Mac computers. It is based on the Unix operating system. Its programs are based on technology developed between 1977 and 1985 at NeXT, a company founded by Steve Jobs before Apple even existed.

When users reinstall macOS, they might get the error UNTRUSTED_CERT_TITLE

Why am I getting the `Untrusted_Cert_Title` error in mac?

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If you get the `untrusted_cert_title` error when you reinstall macOS, you need to check that the date and time settings on your Mac are correct. This problem occurs when your Mac’s system clock is set incorrectly, which leads to a “chicken and egg” problem: If macOS isn’t installed, there’s no direct way to set the clock correctly, which would allow macOS to be installed.

Most encryption algorithms require an accurate and up-to-date clock to establish a secure connection. This is because the encryption system wants to make sure that the digital certificate confirming the integrity of the program has not yet expired. If the date and time embedded in the certificate are set before the release date or after the expiration date, it will not be accepted by the encryption system and an error will be issued during macOS installation.

To fix the date and time settings on your Mac, you need to know the current date and time so you can format them for the command you want. You need the exact day of the month, the numeric equivalent of the month (1 to 12), the current time in hours and minutes in 24-hour format, and the last two digits of the year.

How to Resolve the UNTRUSTED_CERT_TITLE problem in macOS?

Changing the system date through the terminal

  1. Go to Utilities and click Terminal.
  2. Enter the following command and press Enter.
  3. This command displays the date that the system is currently set to.
  4. It may have been reset to 2001 for some reason, so we need to set the correct date.
  5. To do this, type the following command and press Enter.
    date -u [month][day][hour][minute][year]
  6. Two-digit numbers based on UTC should be substituted in each bracket.
  7. This is what the command should look like based on your current date and time – October 30, 2019, 01:15. U.T.C. is used instead of other time zones to avoid problems.
  8. Enter the command exactly like this:
    date -u 1030011519
  9. Check the set date and time by re-running the first command. The error should now be corrected.

Changing the system date and time in Mac Preferences

  1. Select the Apple menu and click System Preferences.
  2. Click on Date and Time.
  3. You may need to click the lock icon, then enter your administrator name and password.
  4. Click Date and time and set the date and time manually.
  5. Uncheck Automatically set date and time and set the current date on the calendar.
  6. Drag the clock hands until they show the correct time, then click Save.
  7. Now try installing macOS again, the error should be fixed.

Frequently Asked Questions

This error is due to incorrect date and time settings. Apple servers use your system time to establish a secure connection. Simply put, the servers have failed to validate the operating system certificate due to incorrect system time settings.

  1. Check the date and time.
  2. Change the trust settings for some certificates.
  3. Reset the key chain.

  1. Check the date on your computer.
  2. Check for configuration errors.
  3. Check to see if the domains match.
  4. Get your certificate from a trusted CA.
  5. Check the certificate structure.
  6. Check for revocation.

  1. Reboot your Mac and install it again.
  2. Set your Mac to the correct date and time.
  3. Create enough free space on your drive to install macOS.
  4. Download a new copy of the macOS installer.
  5. Reset the PRAM and NVRAM memory.
  6. Run First Aid on your startup disk.