content.dropboxapi.com endpoints give "Certificate has been revoked" error from time to time

Hi,

I am testing my web application after migrating to the new API 2.0 (REST), and I notice that from time to time calls to content.dropboxapi.com endpoints give error with the certificate.

This happens both for POST requests and for pre-flight requests.

Example of URL:

https://content.dropboxapi.com/2/files/download?arg={"path":"/aaa.txt"}

I don't see these errors in Chrome, but in Firefox (47) and IE11 they are quite regular.

 

When it happens, the ajax call returns 0 as a status code.

 

In Firefox, if I dig into network log, I see the following error:

"An error occurred during a connection to content.dropboxapi.com.

Peer's Certificate has been revoked.

Error code: SEC_ERROR_REVOKED_CERTIFICATE"

 

In IE, the error is quite in your face, it actually shows the popup with the following message:

 

"Security Alert
---------------------------
The security certificate for this site has been revoked.

This site should not be trusted."

 

Which is quite annoying since users might think IE is complaining about my site. I could implement re-trying logic, but in case of IE, this popup is not something I would like my users to see.

 

 

Hoping for some advice,

Thanks.