See also: IRC auth with a bouncer.

From the bouncer's BouncerServ buffer:

network create -addr ircs://irc.example.com:6697 -nick username -username username -name myserver

Then switch to the new network's BouncerServ buffer (it appears in the sidebar under the network name) and set SASL credentials:

sasl set-plain username password

sasl set-plain is scoped to the buffer's network, so no network argument is needed.

Gotchas

• The ircs:// scheme is required for TLS. Soju doesn't infer TLS from port 6697. Without the scheme it connects in plaintext and the handshake silently times out.
• -pass sets the IRC PASS command, not SASL credentials. For a server that requires SASL, you need sasl set-plain.