According to Article 58135: "
Open Transport 2.0 Read Me", Apple Remote Access (ARA) Multiport Server 2.1, ARA Client 2.0.1 and later, and ARA Personal Server 2.0.1 and later are compatible with Open Transport 1.1 and later.
Note: Mac OS 8.5 installs Open Transport 2.0.1 by default and Mac OS 8.5.1 updates Open Transport to 2.0.2.