Error from Amazon Cloud Drive

Some time I get this message running SYNC
2017/01/22 23:01:16 Attempt 2/3 failed with 0 errors and: Get https://cdws.eu-west-1.amazonaws.com/drive/v1/nodes?filters=parents%3A3UVg1-GGSUql7j5GJBre_g: dial tcp 54.239.34.70:443: getsockopt: connection refused

what does it mean?

Either amazon refused the connection, or your router or ISP blocked it from going through.

A few of these are quite normal.