Checking the Issue/Expiration date for a Certificate

IOS

1. Open Settings
2. Select General
3. Select VPN & Device Management
4. Select the Northwestern University Northwestern MobileConfig profile.
5. Click More Details
6. Click the SCEP Device Identity Certificate. If the Expiry date is before 6/12/31 (Issue date 6/12/26) you will need to removed the profile and re-run the installer. https://services.northwestern.edu/TDClient/30/Portal/KB/Article/1422/Connecting-to-eduroam-on-iOS-iPhone-or-iPad-or-Apple-Watch
7. If the certificate expiration is after 6/12/2026 no action is needed.

Windows

1. In the Windows Search Bar, type Manage User Certificates
2. Click Personal, then Certificates
3. Look for the Certificate Issued by Northwestern University Device Root CA
4. Check the Expiration Date if it is before 6/12/2031 then the installer should be re-run. https://services.northwestern.edu/TDClient/30/Portal/KB/Article/1414/Connecting-to-eduroam-on-Windows
5. If the expiration date is after 6/12/2031 no action is needed.  

MacBook

1. Open Spotlight by pressing Command + Spacebar, type Keychain Access, and press Return.
2. In the left-hand sidebar under Keychains, select a keychain, such as login or System.
3. In the lower-left category list, click Certificates.
4. Double-click the certificate issued by Northwestern University Device Root CA to open and inspect its expiration date, issuer, and details
5. Check the Expiration Date if it is before 6/12/2031 then the profile should be deleted and the installer re-run. https://services.northwestern.edu/TDClient/30/Portal/KB/Article/1423/Connecting-to-eduroam-on-macOS

ChromeBook

1. Open the Chrome browser on your Chromebook.
2. Click the three dots menu (more options) in the top-right corner and select Settings.
3. Click Privacy and security on the left menu, then select Security.
4. Scroll down to Manage certificates and click it.
5. Browse through the tab "Your certificates" to view the installed certificates on your device.
6. Look for the Certificate Issued by Northwestern University Device Root CA
7. If the Expiry date is before 6/12/31 (Issue date 6/12/26) you will need to rerun the installer https://services.northwestern.edu/TDClient/30/Portal/KB/Article/2285/Connecting-to-eduroam-on-Chromebook
8. If the certificate expiration is after 6/12/2031 no action is needed

Linux

1. Run "openssl x509 -in /path/to/certificate.crt -noout -dates"
2. Look for the Certificate Issued by Northwestern University Device Root CA
3. If the Expiry date is before 6/12/31 (Issue date 6/12/26) you will need to rerun the installer https://services.northwestern.edu/TDClient/30/Portal/KB/Article/1113/Connecting-to-eduroam-on-Linux-Ubuntu
4. If the certificate expiration is after 6/12/2031 no action is needed

Android

1. Open Settings on your Android device.
2. Tap Security & Privacy (or Biometrics and security / Lock screen and security, depending on your device brand).
3. Tap More security and privacy or Encryption & credentials.
4. Select User credentials 
5. Tap on the specific certificate to view its details, including its validity dates. (Note: On some stock or older Android versions, Android only lists the names or serial numbers of installed user certificates rather than full expiration date details directly in this menu).
6. If the certificate issued by Northwestern University Device Root CA  expiration is after 6/12/2031 no action is needed
7. If it is prior to that a re-install is required. https://services.northwestern.edu/TDClient/30/Portal/KB/Article/1492/Connecting-to-eduroam-on-Android