AppleTalk Remote Access 2.0.1 added a feature which lets remote Macintosh clients connect to ARA 1.0 and ARA 2.0 servers without setting the "ARA 1.0 compatibility" checkbox in the options window. The ARA 2.0.1 client identifies the type of server by sending two different link request packets, one for 2.0.x and one for 1.0, then decides the version by the server's response.
Because an ARA 1.0 link request packet is exactly the same as an error correction request packet, the modem on the Shiva Remote Access Server will reply positively to the ARA 1.0 link request. The client, seeing the positive reply, decides the server is set up for ARA 1.0 and begins to make an ARA 1.0 connection. Since the Shiva device is looking for an ARA 2.0 connection, the connection will fail.
Shiva is aware of this issue. Please contact Shiva's technical support staff for further assistance.