Cannot Establish Websocket connection

I get the above error message when try to connect my EMS to the cloud server. This works fine on our old server but we have recently migrated to a new server provider. The provider has said that they have opened and enabled websockets connections and they our now blaming our server configuration. Is there something I could be doing wrong in the EMS or Server setup? On my old servers there was no special configuration needed. Have you run into this problem before, any ideas for a solution?

Thank you,

Jason