SSL Handshake fails

Hello,

We seem to have a problem while authenticating. When we try to call https://platform.devtest.ringcentral.com/restapi/oauth/token from out Java Backend to get the access token we get the following error:

I/O error on POST request for "https://platform.devtest.ringcentral.com/restapi/oauth/token":Remote host closed connection during handshake; nested exception is javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake
Caused by: javax.net.ssl.SSLHandshakeException: Remote host closed connection during handshake

This was working until 21/12 when we last checked before holidays. Has something changed during that time period?

Thank you