To continue a stalled SCP file transfer is easy using rsync. The rsync command will allow you to continue a partial file transfer using SSH to encrypt the transfer. Many times when doing a large file transfer with SCP you run the risk of the connection to the server dropping during the transfer or of the transfer becoming stalled. Regardless of either one you can continue things with rsync as shown below.
The below command should be run from the server that the file is being transferred too.
rsync --partial --progress --rsh=ssh email@example.com:/path/to/file/remote-file-name local-file-nameencrypted, rsync, SCP, SSH, stalled, yum