Abstract: A message processing device includes a memory and a processor coupled to the memory. The processor is configured to receive a transmission instruction from a first information processing device. The transmission instruction includes a first message, first authentication information to be used for first authentication of authenticating a first user, and first identification information for identifying a first storage area. The processor is configured to identify the first storage area by using the first identification information. The processor is configured to store the first message in the identified first storage area. The processor is configured to perform the first authentication by using the first authentication information. The processor is configured to store, when the first authentication is successfully completed, information indicating authenticity in the first storage area in association with the first message.

Abstract: A control system includes a communication control device including a memory, and a processor coupled to the memory and configured to execute a determination process that includes, when an operation request is received via a specific destination server, determining whether the operation request is a management operation or an application operation based on header information included in the operation request, execute a transfer process that includes, if the operation request is the application operation, transferring the operation request related to the application operation to a server running the application, and execute a blocking process that includes, if the operation request is the management operation, blocking the operation request related to the management operation.

Abstract: A queue management method including queuing, in a specific queue of a first virtual machine, one or more messages addressed to the specific queue, generating, when transferring management of the specific queue from the first virtual machine to a second virtual machine, a first queue and a second queue in the second virtual machine, queuing, in the generated first queue, the one or more messages that have been queued in the specific queue, queuing, after the second queue has been generated, a received message addressed to the specific queue in the second queue and performing, in response to an instruction to perform reference to or an operation for a specific message corresponding to the specific queue, reference to or an operation for the specific message in order of the first queue, the specific queue, and the second queue.