And enabling curl debug: [ 76s] upload completely sent off: 179 out of 179 bytes [ 76s] OpenSSL SSL_read: SSL_ERROR_SYSCALL, errno 104 [ 76s] Closing connection 0 [ 76s] (304) (OUT), TLS Unknown, Unknown (21): [ 76s] [ 76s] Program received signal SIGPIPE, Broken pipe. errno 104 is ECONNRESET.