Hi
I am trying to upload a package to ppa with sftp. I have a local ssh agent running and uploaded the public key in launchpad. When I run the dput command I get the following error,

rejected by the upload queue management software.
Uploading to ppa (via sftp to ppa.launchpad.net):
xxxxxxx_xxxx-.dsc:
Unable to connect to SSH host ppa.launchpad.net; EOF during negotiation
E: Error uploading file.

When running,
Code:
ssh  -T ppa.launchpad.net
No shells on this server.

I could ssh to my github account with the same public keys from the same machine. I could not find any useful help online either. Can some one help ?