Logic App Standard - Service Bus Trigger

Question

Dear Team,

I am using Logic App Standard and outbound traffic enabled with VNET Integration. Utilizing the service bus trigger logic app and it connects to service bus. Connectivity is also going through from VNET. However, I am getting this error whenever logic app connects to service bus using https over port 443. I removed some of the additional properties and kept generic error message.

Outgoing HTTP request ends with server failure:

operationName='CallApiHubEndpoint.Trigger.CustomApi/servicebus', httpMethod='GET'

exceptionMessage='System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream. at System.Net.Security.SslStream.<FillHandshakeBufferAsync>g__InternalFillHandshakeBufferAsync|189_0TIOAdapter at System.Net.Security.SslStream.ReceiveBlobAsyncTIOAdapter at System.Net.Security.SslStream.ForceAuthenticationAsyncTIOAdapter at System.Net.Http.ConnectHelper.EstablishSslConnectionAsync(SslClientAuthenticationOptions sslOptions, HttpRequestMessage request, Boolean async, Stream stream, CancellationToken cancellationToken)', errorCode='', errorMessage='', referer='<null>', failureCause='', contentType='', contentEncoding='', armServiceRequestId='', organizationId='', activityVector='IN.1B', locale='en-US',

Answer 1

Hi @Ronak Sanghavi ,

Welcome to Microsoft Q&A Platform!

It looks like you're encountering an issue with your Logic App Standard when trying to connect to the Service Bus over HTTPS. The error message indicates a problem with the SSL/TLS handshake, which could be related to network configuration or firewall settings.

• Ensure that your VNET integration is correctly set up and that the necessary routes and network security groups (NSGs) allow outbound traffic to the Service Bus.
• Verify that your Service Bus is configured to accept the TLS version that your Logic App is using. Ensure that both services support the same TLS version.
• Make sure that any firewalls between your Logic App and the Service Bus allow traffic on port 443.

To help you better understand, kindly refer to the documentation below:

Connect to Azure Service Bus from workflows - Azure Logic Apps

This guide provides detailed steps on accessing Azure Service Bus from a workflow and managing service bus items.

I hope this is helpful! Feel free to reach out if you have any more questions or need further assistance.