On TeamForge servers (both single-server/distributed setups), if the first interface is not "eth0/enp0", you must set this token with the network interface card (NIC) name which PostgreSQL must listen to.
If the first interface of "ifconfig -a" is not eth0/enp0*, set the POSTGRES_INTERFACE token in the site-options.conf file with the NIC name that PostgreSQL should listen to, without which you cannot successfully create runtime. You can add more than one NIC name if you want to have PostgreSQL listen to multiple IPs.