Azure ServiceBus topic has 4 subscriptions without filters. One Subscription not receiving any messages

Question

I got an Azure Service Bus with a topic, say "insured". Under "insured" , there are 4 subscriptions , say , S1,S2,S3 & S4. All the subs are configured with default settings and NO Filters added.

However, when I post a message into the topic, I can see the message is successfully read into S1,S2 and S4. S3 is never getting that message.

Any one experienced this kind of issue ? Please provide your inputs. Thanks !

a.) Deleted and recreated the Subscription, but of no use. b.) Deleted and recreated the topic with same subscription names. It worked for a while, again S3 became vegetative.

Are you sure about no rules? W/o rules no subscription can receive any messages. — Sean Feldman, Feb 20 '23 at 23:24

score 0 · Answer 1 · answered Feb 21 '23 at 06:28

Azure Service Bus topic has 4 subscriptions without filters. One Subscription not receiving any messages:

There can be more reasons for this occurrence. Check below to resolve it.

Verify that the subscription (S3) status is active and the forward message option is enabled. It will be disabled while creating the subscription.

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Verify if there are any network or firewall settings configures with the S3 subscription that blocks sending and receiving messages.
Check if there are any active filters configured in subscription (S3). Because some active filters can prevent messages from being sent and block the activity.

Goto Service bus namespace -> Topic -> Subscriptions -> S3 -> Filters

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Check if anyone else is trying to access the same subscription. If that is the case, the messages may also be consumed before the subscription can read them.

As mentioned in this MSDoc, I created four service bus subscriptions, a new topic with a new service bus namespace in my environment and was able to send the messages without any conflicts.

Created a topic using AzCLI:

az servicebus topic create --resource-group <ResourceGroup> --namespace-name <servicebusnamespace> --name MyTopic

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Created subscriptions as shown:

az servicebus topic subscription create --resource-group <Resourcegroup> --namespace-name <namespacename> --topic-name MyTopic --name S1
az servicebus topic subscription create --resource-group <Resourcegroup> --namespace-name <namespacename> --topic-name MyTopic --name S2
az servicebus topic subscription create --resource-group <Resourcegroup> --namespace-name <namespacename> --topic-name MyTopic --name S3
az servicebus topic subscription create --resource-group <Resourcegroup> --namespace-name <namespacename> --topic-name MyTopic --name S4

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