pg_basebackup giving "could not receive data from client: Connection reset by peer"

I'm trying to get data to a new slave box from my new master (previously the slave).

I've tried the steps already and it worked previously. Now when I run the following command:

pg_basebackup -h masterhost -D /var/lib/postgresql/9.3/main -U rep -v -P -X stream

Sometimes when I run this command, nothing is logged. Other times I receive: "could not receive data from client: Connection reset by peer". I can see this process running on the master:

postgres: wal sender process rep slavehost(60899) sending backup "pg_basebackup base backup"  

• I'm able to scp from one box to another at 100MB/s


• I've set up the snakeoil certs on both boxes


• It rejects invalid passwords


• When I kill the process on the slave, I get "pg_basebackup: could not initiate base backup: FATAL: terminating connection due to administrator command"


• There is no additional load on either box when I run this command


• The /var/lib/postgresql/9.3/main dir on the slave is owned by postgres and is empty


• The DB is ~60GB


• Eventually the "wal sender process" on the master ends but nothing seems to happen


• I can psql to the master box from the slave using a non-replication user