Error pushing existing local repository to new remote origin

I recently created the repository at https://bitbucket.org/kellettcommunications/acca.git. I have an existing local repository that used to be in Github that I want to migrate over to Bitbucket.

I removed all the original remote origin info from the repository configuration and added the Bitbucket remote origin. When I try to do the initial git push, I keep getting the following error and don't understand why:

error: RPC failed; result=55, HTTP code = 0
fatal: The remote end hung up unexpectedly

This happens after a long timeout.

Using verbose mode does not give me any additional useful output.

Please advise.