curl hangs after client hello

When I execute the following command in Ubuntu: curl -v --insecure -XGET 'https://user:pass@IP_ADDR:PORT/SOME_FILE.php ' I get this output: * Hostname was NOT found in DNS cache * Trying IP_ADDR... * Connected to IP_ADDR (IP_ADDR) port PORT (#0) * successfully set certificate verify locations: * CAfile: none CApath: /etc/ssl/certs * SSLv3, TLS handshake, Client hello (1): And after several minutes I get this: * Unknown SSL protocol error in connection to IP_ADDR:PORT * Closing connection 0 curl: (35) Unknown SSL protocol error in connection to IP_ADDR:PORT When I try the same thing in CentOS I still get stuck in Client Hello, but in the end I get this: curl: (28) Operation timed out after 0 milliseconds with 0 out of 0 bytes received Does anyone knows what can cause it and how can I fix it?