Source: GroupWise® engine; client/server.
Explanation: The POA is configured to require SSL communicate with the GroupWise client, but the client is not capable of SSL communication.
Possible Cause: SSL communication was introduced for the GroupWise client in GroupWise 6.5. You are running an older GroupWise client against a post office that has been updated to GroupWise 6.5 or higher.
Action: Update the client to GroupWise 6.5 or higher.
Action: Reconfigure the POA so that SSL is enabled rather than required. See "Enhancing Post Office Security with SSL Connections to the POA" in "Configuring the POA" in the GroupWise 6.5 Administration Guide.