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. Below is a sample of an encoded certificate:

An example of an encoded X.509 certificate
If your team members are seeing an error when trying to use single-sign on to sign in, you may need to update your X.509 certificate. Learn how.
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