Connect to Sql Azure from 1and1 wensite

I have a problema when I try to connect my SQL Azure database from my web which is hosted in 1and1 servers. I did a lot of tests but without a good result. I added the proxy in web.config but the same issue was reproduced. Exactly, the proxy is:

I change the firewall of my SQL Azure to make diferent tests but they didn't work fine. The firewall was set to accept connections from 0.0.0.0 to 255.255.255.255. I know this is not recommended, but I did it to test.

Do you know how could I resolve this issue, please?

Any information will be appreciated.

Thanks a lot in advance.

Cheers.

David Ortega.