What's an X.509 certificate?
An X.509 certificate is needed to authenticate your identity and keep your data safe.
It usually comes from your identity provider and can come in a variety of formats. Dropbox only accepts .pem, .cer, or .crt.
The image to the right is a sample of an encoded certificate.
If your team members are seeing an error when trying to use single-sign on to log in, you may need to update your X.509 certificate. Learn how.