FAQ

For error messages returned by Simple Message Queue (SMQ, formerly MNS), see Error codes. For other common issues, browse by category:

Introduction

• What is Simple Message Queue (formerly MNS)?

• How to use Simple Message Queue (formerly MNS)?

• What can you do with Simple Message Queue (formerly MNS)?

• What is the Account ID?

• What are the endpoints of SMQ in each region?

• What operations does SMQ provide?

• Limits on topic subscriptions

• Does Simple Message Queue (formerly MNS) support long polling?

• Does Simple Message Queue (formerly MNS) provide first-in, first-out (FIFO) access to messages?

• Can Simple Message Queue (formerly MNS) be used with other Alibaba Cloud products?

• What are the advantages of Simple Message Queue (formerly MNS) compared to self-developed, commercial, or open source message queue systems?

Billing

• Does billing continue after a queue is deleted?

• Does billing continue after a subject is deleted?

Messages

• Cannot receive messages after a successful subscription in Simple Message Queue (formerly MNS)

• What do I do if the error message "message not exist" appears when I delete a message in SMQ?

• How do I troubleshoot the issue that the HttpEndpoint operation fails to receive messages?

• Why does signature authentication fail when I call the HttpEndpoint operation?

• How do I improve the authentication performance when I use the HttpEndpoint operation?

• What do I do if I am unable to receive the HTTP body when I write the HttpEndpoint operation in PHP?

• [What do I do if the error message "[Error Code]:InvalidRequestURL, [Message]:Http request URL format invalid" is returned by SMQ?](t1835792.dita#)

• How are messages identified in the system?

• Preventing message loss or duplicate consumption in Simple Message Queue (formerly MNS)

• How many times is each message consumed?

• How do I configure Simple Message Queue (formerly MNS) to support a longer message retention period?

• How to configure Simple Message Queue (formerly MNS) to support larger message sizes?

• What do the message count, number of messages visible, and number of messages delayed metrics indicate?

• Can I use SMQ to send or receive multiple messages at a time?

• Why do BatchReceiveMessage and BatchPeekMessage return fewer messages than the number of visible messages in a queue?

• How can I do if MNS data is lost or fails to be queried?

Queues

• Do queues in different regions represent the same queue if the queues have the same name?

• Does SMQ delete a queue that has not been used for a long period of time?

• How long does a push request sent from a topic time out if the specified HTTP endpoint does not respond to the request?

SDKs

• SDK downloads

• [What do I do if the error message "[Error Code]:403 AccessDenied [Message]:The OwnerId that your Access Key Id associated to is forbidden for this operation" appears when an SDK is called?](t1835793.dita#)

• How to implement reconnection retry mechanism in clients

• Why do both console and client SDKs have resource management APIs?

• FAQ about SDK for Java

APIs

• How do I use the SMQ API?

• Why is my signature calculation always incorrect?

• What do I do if the error message "403 SignatureDoesNotMatch" appears when I call an SMQ API operation?

• [What do I do if the error message "[Error Code]:403 AccessDenied [Message]:The OwnerId that your Access Key Id associated to is forbidden for this operation" appears when an API is called?](t1835793.dita#)

Terraform

• An error is returned when you use Terraform to create resources in Heyuan ACDR Auto region

Security

• How to verify the public key certificate URL in a Simple Message Queue (formerly MNS) push request

• Are messages in my queues secured?

• How to ensure data reliability in Simple Message Queue (formerly MNS)?

• What do I do if "No Permission" is returned when I grant AliyunMNSLoggingRole to a RAM user?