Fix logic for separating port and host for IPv6 literal addresses

untls_proxy.py

@@ -245,7 +245,7 @@ def proxy(sock, host):
 	elif b':' not in remote_host:
 		port = None
 	else:
-		remote_host, port = remote_host.rsplit(b':')
+		remote_host, port = remote_host.rsplit(b':', 1)
 		try:
 			port = int(port)
 			if port < 1 or port > 0xffff: raise ValueError