将 Orchestrator 从 2018.4 升级到 2020.10

观察到的行为

禁用长轮询的 Orchestrator 从 2018.4 升级到 2020.10 后，2018.4.6 版机器人仍会保持连接并使用端口，但无法执行作业。

显示的错误消息 Insufficient memory to continue the execution of the program.

完整错误消息：

HubConnection start failed, err : StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
HubConnection start failed, err : An error occurred while sending the request.
HubConnection start failed, err : An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full
System.OutOfMemoryException: Insufficient memory to continue the execution of the program.

原因

机器人在计算机上仍保持连接状态，不仅占用了大量计算机端口，还消耗了大量内存。

分辨率

重新启动计算机上的机器人服务，清除端口占用并释放内存。